Product Image

Prolific Sour Green Apple

PEScience
4.7
★ ★ ★ ★ ★
(79 ratings)
Theanine 200 mg
Caffeine 320 mg
Rhodiola
Product Image
Score68
Strong performance doses and a serious focus stack make this useful for experienced pre-workout users. High caffeine, weak rhodiola depth, and premium value make it unsuitable for stimulant-sensitive or late-day use.
How scoring works
Quantity:9 Ounce(s) • (20 servings)
Goals:
Fitness
Productivity Boost
Energy
Mental Focus
Brain Health
Cognitive Support
Weight Loss
Metabolism Boost
Muscle Gain

Score 68

Strong performance doses and a serious focus stack make this useful for experienced pre-workout users. High caffeine, weak rhodiola depth, and premium value make it unsuitable for stimulant-sensitive or late-day use.
How scoring works

Also available as

1 option
Cotton Candy Theanine 200 mg, Rhodiola 100 mg +1 more • 9 Ounce(s) • 20 servings $39.99 ($1.99 per serving)
$39.99($1.99 per serving)
iHerb
$ 39.99
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Analysis

L-citrulline at 6 g, betaine at 2.5 g, and taurine at 1.5 g provide a well-dosed physical-performance core. These amounts are aligned with workout use for blood flow, power support, and training volume.

The label states 320 mg total caffeine across caffeine anhydrous and Infinergy, paired with 250 mg citicoline and 200 mg L-theanine. The focus stack is purposeful, but the stimulant level is high enough to cause marked side effects in sensitive users.

Rhodiola and coffee-fruit extract are each supplied at 100 mg, with rhodiola lacking active-marker standardization. The formula fits demanding workouts and acute productivity better than stress, mood, or sleep support, and the costly short supply reduces value.

Who is it for
  • Experienced adults who tolerate high-stimulant pre-workouts
  • Athletes seeking both physical and mental workout support
  • Users who can train early enough to protect sleep
Best for
  • High-intensity workout energy
  • Training blood flow and power support
  • Acute pre-workout focus

Pros

  • Provides 6 g L-citrulline
  • Includes 2.5 g betaine and 1.5 g taurine
  • Pairs 320 mg total caffeine with 200 mg L-theanine
  • Uses 250 mg branded citicoline

Cons

  • Caffeine is high at 320 mg
  • Rhodiola is lightly dosed and unstandardized
  • Serving value is weak
  • No creatine or protein is included

Warnings

  • The 320 mg caffeine serving may cause jitteriness, nausea, headache, rapid heartbeat, or increased blood pressure.
  • Avoid late-day use because immediate and extended caffeine sources can substantially delay sleep.
  • Do not combine the full serving with other caffeine or stimulant products; account for coffee, energy drinks, and fat burners.

Nutrient quality

79 High impact

Caffeine anhydrous, Infinergy, and branded citicoline support form quality, while rhodiola lacks standardization; core performance ingredients are strongly dosed, while rhodiola is modest. The very high stimulant load creates a clear risk of jitters, rapid heartbeat, and sleep disruption; the ingredient set strongly fits workout performance and focus; most additions are substantial, though rhodiola contributes less at its amount.

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Ingredient transparency

68 High impact

Every listed active has a specific amount; no proprietary blend hides key doses. Specific forms and branded ingredients are clear, but duplicate caffeine entries obscure how the total is allocated; serving directions and inactive ingredients are not included in the supplied details.

.

Customer satisfaction

68 High impact

The supplied aggregate average is very favorable, though no individual feedback is available; the rating sample is moderate, but no individual feedback is supplied. Detailed feedback is absent, so repeated complaints cannot be assessed; real-world fit with the intended purpose remains uncertain.

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Value for money

53 Moderate impact

Strong dosing and premium forms partly support the high cost; the serving is expensive despite substantial performance doses. Most ingredients contribute meaningful performance value; the product is costly relative to many pre-workout competitors.

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Report analysis

Goals

Fitness
Fitness
Impact
Highest effect
A+ Goal FitA Strength of SupportA CoverageA Formula Quality
Betaine Anhydrous · 2.5 Gram(s)Citrulline · 6 Gram(s)Caffeine · 320 mg

Citrulline, betaine, taurine, and caffeine directly support blood flow, work capacity, hydration, and training drive. Citrulline, betaine, and caffeine have relevant human performance evidence, while Rhodiola adds situational fatigue support.

The 6 g citrulline, 2.5 g betaine, 1.5 g taurine, and 320 mg total caffeine amounts are performance-level doses. Most actives use researched or branded forms with exact amounts, although Rhodiola marker percentages are not stated. The 320 mg total caffeine amount is high and may cause jitteriness, faster heart rate, or sleep disruption, especially with other stimulants.

Study evidence
Caffeine Supportive 255 studies
Citrulline Supportive 45 studies
Rhodiola Supportive 13 studies
Taurine Supportive 21 studies
Productivity Boost
Productivity Boost
Impact
Highest effect
A Goal FitA Strength of SupportA CoverageA Formula Quality
Theanine · 200 mgCaffeine · 320 mg

Caffeine, citicoline, theanine, rhodiola, and coffee-fruit extract form a strongly productivity-oriented focus and energy stack. Caffeine has robust alertness evidence, while citicoline and theanine are credible supports and rhodiola evidence is more variable.

The formula covers acute alertness, attention chemistry, stress modulation, and exercise-related energy. Theanine sensibly tempers caffeine, while citicoline and rhodiola complement attention and fatigue resistance; the high stimulant amount may still cause jitters or disrupt sleep.

Study evidence
Caffeine Supportive 108 studies
Rhodiola Supportive 7 studies
Theanine Supportive 5 studies
Energy
Energy
Impact
Highest effect
A+ Goal FitA- Strength of SupportA CoverageB+ Formula Quality
Caffeine · 320 mg

Caffeine, citrulline, betaine, taurine, citicoline, and theanine provide strong acute energy, focus, and exercise support. The formula covers both physical performance and mental alertness with purposeful doses.

The caffeine amount is high enough to cause jitters, headaches, nausea, or sleep disruption in sensitive users. Rhodiola is underdosed and unstandardized, so stress-resilience support is weaker than the stimulant and performance pathways.

Study evidence
Caffeine Supportive 68 studies
Citrulline No effect 14 studies
Rhodiola Supportive 18 studies
Theanine Not classified

No linked studies yet.

Mental Focus
Mental Focus
Impact
Highest effect
A- Goal FitA- Strength of SupportA- CoverageA- Formula Quality
Theanine · 200 mgCaffeine · 320 mg

Caffeine, citicoline, theanine, and rhodiola combine alertness, cholinergic support, calm focus, and stress resilience. Citicoline and theanine are well chosen, while the rhodiola amount is modest and lacks active-marker standardization.

The high caffeine intake may cause jitters, headache, or sleep disruption in sensitive users despite the balancing theanine. A variable scoop direction also makes it important to confirm the actual serving before use.

Study evidence
Caffeine Supportive 128 studies
Rhodiola Supportive 15 studies
Theanine Supportive 19 studies
Brain Health
Brain Health
Impact
Highest effect
A- Goal FitB+ Strength of SupportA- CoverageB Formula Quality

Citicoline, theanine, rhodiola, caffeine, and coffee-fruit extract support acute focus and mental stamina. The formula is performance focused rather than designed for long-term neuroprotection.

Citicoline and theanine have useful amounts, while rhodiola is below its preferred range. The high combined stimulant load may cause jitteriness, headaches, or sleep disruption in sensitive users.

Study evidence
Rhodiola Supportive 8 studies
Theanine Supportive 17 studies
Cognitive Support
Cognitive Support
Impact
Highest effect
A- Goal FitA Strength of SupportA- CoverageC Formula Quality
Theanine · 200 mg

Citicoline, L-theanine, Rhodiola, coffee fruit extract, and caffeine create a broad, potent focus stack. Most central cognitive amounts are transparent and well aligned.

The formula is logically built for pre-workout attention but remains more stimulating than a balanced daily nootropic. Two caffeine sources are each listed at 320 mg, so stimulant-sensitive users may face marked jitteriness, rapid heartbeat, or sleep disruption.

Study evidence
Rhodiola Supportive 7 studies
Theanine Supportive 25 studies

Ingredients

IngredientAmount per serving
L-Citrulline
6 Gram(s)
Betaine Anhydrous
2.5 Gram(s)
Taurine
1.5 Gram(s)
Caffeine (Caffeine Anhydrous, Infinergy)
 320 mg
Cognizin (Citicoline)
 250 mg
L-Theanine
200 mg
Rhodiola rosea Root Extract
100 mg
NeuroFactor (Coffee Fruit Extract)
 100 mg
Adults 18–50 Women
Report overview
Theanine · 200 mg OverallScore82
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyD+ Value

Clearly identified L-theanine reaches a well-aligned amount and may help balance the formula’s heavy stimulant profile. Two listed caffeine sources create a very high combined load, which may increase jitters, nausea, headaches, and sleep disruption in sensitive users. Theanine-specific cost is high, but substantial citicoline and performance ingredients improve the broader formula’s value.

View ingredientView products
Caffeine (Caffeine Anhydrous, Infinergy) · 320 mg OverallScore74
A+ Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyF Value

Caffeine anhydrous and Infinergy di-caffeine malate provide standardized, multi-stage caffeine delivery. The clearly stated 320 mg total is very high for one serving. A very high serving cost results in poor value despite the premium release system.

View ingredientView products
Rhodiola · 100 mg OverallScore58
C+ Active Ingredient Quality & BioavailabilityB Dose, Safety & Label TransparencyF Value

The disclosed Rhodiola rosea root extract supports species identity, but its active markers are not standardized. The serving supplies 100 mg, which is below the preferred range for a stand-alone Rhodiola product. The listed caffeine ingredients create a substantial stimulant load that may increase jitteriness or disrupt sleep, particularly for stimulant-sensitive users.

View ingredientView products
Loading alternative details
77 Performance

Pulse Fruit Punch

Legion
Citrulline malate, beta-alanine, betaine, Alpha-GPC, theanine, and clearly stated caffeine provide stronger workout depth and label clarity. Its caffeine dose is still very high, requiring the same caution around sensitivity and late-day use.
84 Performance

L-Theanine & Caffeine

SR Sports Research
A two-to-one theanine-to-green-coffee caffeine ratio provides a more predictable calm-focus option. It lacks full pre-workout ingredients, but the moderate, fully stated stimulant dose avoids the original label’s ambiguous caffeine split.
79 Performance

Cortisol Calm

Pure Encapsulations
Standardized rhodiola combines with ashwagandha, magnolia, and theanine for deeper non-stimulant stress support. It will not match the original exercise performance profile, but it offers a clearer fit for calm focus.
73 Budget

Nitrosurge Shred Orange Pineapple

Jacked Factory JF
Caffeine, theanine, acetyl-L-carnitine, citrulline, and beta-alanine provide focused workout support at better serving economics. Citrulline and beta-alanine are less substantial than in the original, but the stimulant dose is clearer and more moderate.
74 Budget

Hydroxycut Hardcore Elite

MuscleTech Performance Series
Caffeine, green coffee, and theanine provide low-cost energy support. It lacks the original workout foundation, and yohimbe adds notable anxiety, cardiovascular, and sleep trade-offs.
83 Budget

Pure Energy

Swanson
The same caffeine, theanine, and rhodiola collections appear in a concise formula with favorable value. Citrulline, betaine, taurine, and citicoline are absent, so it is better suited to general focus than exercise performance.
84 Value

Smart Caffeine with L-Theanine

NS Natural Stacks
Moderate green-coffee caffeine and twice as much theanine deliver economical focused energy with clear amounts. Workout ingredients are absent, but the lower stimulant load and simple label improve everyday usability.
82 Value

Elite

Eu Natural
A straightforward two-to-one theanine-to-caffeine formula supports calm focus at favorable value. The caffeine source is unspecified and exercise actives are omitted, so it is a daily-focus alternative rather than a direct training replacement.
70 Value

Energy + Focus

ZHOU
Theanine and caffeine provide inexpensive focus support, but three identical caffeine entries make the total dose unclear. That uncertainty requires verification and prevents it from being an unqualified recommendation.
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Effect of caffeine ingestion on time trial performance in cyclists: a systematic review and meta-analysis.
    Chen B; Ding L; Qin Q; Lei TH; Girard O; Cao Y · Journal of the International Society of Sports Nutrition · 2024
    Meta-analysis15 studies pooledFitness forCaffeine
  2. Using coffee to compensate for poor sleep: Impact on vigilance and implications for workplace performance.
    Anderson JR; Hagerdorn PL; Gunstad J; Spitznagel MB · Applied ergonomics · 2018
    Randomized trial69 participantsMental Focus forCaffeine
  3. Promising, but Not Completely Conclusive-The Effect of l-Theanine on Cognitive Performance Based on the Systematic Review and Meta-Analysis of Randomized Placebo-Controlled Clinical Trials.
    Mátyus RO; Szikora Z; Bodó D; Vargáné Szabó B; Csupor É; Csupor D; Tóth B · Journal of clinical medicine · 2025
    Meta-analysis148 participants5 studies pooledMental Focus forTheanine
  4. Failure of Rhodiola rosea to alter skeletal muscle phosphate kinetics in trained men.
    Walker TB; Altobelli SA; Caprihan A; Robergs RA · Metabolism: clinical and experimental · 2007
    Randomized trial12 participantsFitness forRhodiola
  5. The effects of an acute dose of Rhodiola rosea on endurance exercise performance.
    Noreen EE; Buckley JG; Lewis SL; Brandauer J; Stuempfle KJ · Journal of strength and conditioning research · 2013
    Randomized trial18 participantsMental Focus forRhodiola
  6. No effects of caffeine on cycling to exhaustion and perceptual responses in non-caffeine-restricted subjects.
    Weippert M; Behrens M; Schlegel M; Schröder T; Tillmann M; Rühe N; Römer R; Mau-Möller A; Bruhn S · Journal of the International Society of Sports Nutrition · 2025
    Randomized trial56 participantsFitness forCaffeine
  7. Physiological and cognitive responses to caffeine during repeated, high-intensity exercise.
    Crowe MJ; Leicht AS; Spinks WL · International journal of sport nutrition and exercise metabolism · 2007
    Randomized trial17 participantsMental Focus forCaffeine
  8. Time for tea: mood, blood pressure and cognitive performance effects of caffeine and theanine administered alone and together.
    Rogers PJ; Smith JE; Heatherley SV; Pleydell-Pearce CW · Psychopharmacology · 2008
    Randomized trial48 participantsMental Focus Productivity Boost forTheanine
  9. Acute Rhodiola rosea intake can improve endurance exercise performance.
    De Bock K; Eijnde BO; Ramaekers M; Hespel P · International journal of sport nutrition and exercise metabolism · 2004
    Randomized trial24 participantsFitness Mental Focus forRhodiola
  10. Rosenroot (Rhodiola rosea): traditional use, chemical composition, pharmacology and clinical efficacy.
    Panossian A; Wikman G; Sarris J · Phytomedicine : international journal of phytotherapy and phytopharmacology · 2010
    Narrative reviewMental Focus Brain Health forRhodiola
  11. A double-blind, placebo-controlled study evaluating the effects of caffeine and L-theanine both alone and in combination on cerebral blood flow, cognition and mood.
    Dodd FL; Kennedy DO; Riby LM; Haskell-Ramsay CF · Psychopharmacology · 2016
    Randomized trial24 participantsMental Focus forTheanine
  12. Caffeinated Coffee and Tea Consumption, Genetic Variation and Cognitive Function in the UK Biobank.
    Cornelis MC; Weintraub S; Morris MC · The Journal of nutrition · 2020
    Cross-sectional study445,786 participantsMental Focus forCaffeine
  13. Effect of caffeine ingestion on cycling performance: a systematic review and meta-analysis.
    Wu J; Xu K; Yin M; Ding X; Wang T; Zhang Q; Wu X; Xiao N · Frontiers in nutrition · 2026
    Meta-analysis226 participants20 studies pooledFitness forCaffeine
  14. Effects of Rhodiola rosea on Physical and Decision-Making Performance in Football Players: A Randomised Controlled Trial.
    Dou Y; Wang Y; Zhang W; Jiang Y; Zhang J; Yang T; Han Z; Li Y; Liu C; Ren D · Nutrients · 2026
    Randomized trial24 participantsFitness Mental Focus Energy forRhodiola
  15. The effectiveness and efficacy of Rhodiola rosea L.: a systematic review of randomized clinical trials.
    Hung SK; Perry R; Ernst E · Phytomedicine : international journal of phytotherapy and phytopharmacology · 2012
    Systematic review11 studies pooledMental Focus forRhodiola
  16. Effects of Caffeine Intake on Endurance Running Performance and Time to Exhaustion: A Systematic Review and Meta-Analysis.
    Wang Z; Qiu B; Gao J; Del Coso J · Nutrients · 2023
    Meta-analysis254 participants21 studies pooledFitness forCaffeine
  17. Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
    Payne ER; Aceves-Martins M; Dubost J; Greyling A; de Roos B · Nutrition reviews · 2025
    Meta-analysis50 studies pooledMental Focus Brain Health Cognitive Support forTheanine
  18. Acute effects of caffeine on attention: a comparison of non-consumers and withdrawn consumers.
    Smith AP; Christopher G; Sutherland D · Journal of psychopharmacology (Oxford, England) · 2013
    Randomized trial70 participantsMental Focus forCaffeine
  19. Dose-Response Effects of Short-Term Rhodiola rosea (Golden Root Extract) Supplementation on Anaerobic Exercise Performance and Cognitive Function in Resistance-Trained Athletes: A Randomized, Crossover, Double-Blind, and Placebo-Controlled Study.
    Koozehchian MS; Newton AT; Mabrey G; Bonness FM; Rafajlovska R; Naderi A · Nutrients · 2025
    Randomized trial27 participantsMental Focus Fitness Brain Health forRhodiola
  20. Caffeine, CYP1A2 Genotype, and Endurance Performance in Athletes.
    Guest N; Corey P; Vescovi J; El-Sohemy A · Medicine and science in sports and exercise · 2019
    Randomized trial101 participantsFitness forCaffeine
  21. Effects of modafinil and caffeine on night-time vigilance of air force crewmembers: A randomized controlled trial.
    Wingelaar-Jagt YQ; Bottenheft C; Riedel WJ; Ramaekers JG · Journal of psychopharmacology (Oxford, England) · 2023
    Randomized trial32 participantsMental Focus forCaffeine
  22. Dose-response effect of L-theanine on psychomotor speed, sustained attention, and inhibitory control: a double-blind, placebo-controlled, crossover study.
    Dassanayake TL; Wijesundara D; Kahathuduwa CN; Weerasinghe VS · Nutritional neuroscience · 2023
    Randomized trial32 participantsMental Focus Cognitive Support forTheanine
  23. The Effect of Short-Term Rhodiola rosea Supplementation on Simulated Game Time, Perceived Fatigue, and Performance in Basketball Players.
    Wang J; Zhao H; Yu L; Zhao K; Jiang W; Liu S; Dai J; Xu L; Sun P; Yun H; Liu C · Nutrients · 2025
    Randomized trial48 participantsFitness Energy forRhodiola
  24. Placebo in sports nutrition: a proof-of-principle study involving caffeine supplementation.
    Saunders B; de Oliveira LF; da Silva RP; de Salles Painelli V; Gonçalves LS; Yamaguchi G; Mutti T; Maciel E; Roschel H; Artioli GG; Gualano B · Scandinavian journal of medicine & science in sports · 2018
    Randomized trial42 participantsFitness forCaffeine
  25. The effects of L-theanine, caffeine and their combination on cognition and mood.
    Haskell CF; Kennedy DO; Milne AL; Wesnes KA; Scholey AB · Biological psychology · 2008
    Randomized trialMental Focus forCaffeine
  26. Acute effects of theanine, caffeine and theanine-caffeine combination on attention.
    Kahathuduwa CN; Dassanayake TL; Amarakoon AMT; Weerasinghe VS · Nutritional neuroscience · 2018
    Clinical trial20 participantsMental Focus Cognitive Support forTheanine
  27. Combined Rhodiola rosea and eccentric training boost endurance performance and lower-limb reactive strength in recreationally active women.
    Wang IL; Su Y; Zhang L; Tang M; Chen YM · Frontiers in physiology · 2025
    Randomized trial30 participantsFitness Energy forRhodiola
  28. Effects of Rhodiola rosea supplementation on mental performance, physical capacity, and oxidative stress biomarkers in healthy men.
    Jówko E; Sadowski J; Długołęcka B; Gierczuk D; Opaszowski B; Cieśliński I · Journal of sport and health science · 2022
    Randomized trial26 participantsMental Focus Productivity Boost forRhodiola
  29. Acute Effects of Caffeine Supplementation on Movement Velocity in Resistance Exercise: A Systematic Review and Meta-analysis.
    Raya-González J; Rendo-Urteaga T; Domínguez R; Castillo D; Rodríguez-Fernández A; Grgic J · Sports medicine (Auckland, N.Z.) · 2021
    Meta-analysis12 studies pooledFitness forCaffeine
  30. Caffeine and attentional control: improved and impaired performance in healthy older adults and Parkinson's disease according to task demands.
    Sharma K; Fallon SJ; Davis T; Ankrett S; Munro G; Christopher G; Coulthard E · Psychopharmacology · 2022
    Randomized trial68 participantsMental Focus forCaffeine
  31. Effects of l-Theanine on Cognitive Function in Middle-Aged and Older Subjects: A Randomized Placebo-Controlled Study.
    Baba Y; Inagaki S; Nakagawa S; Kaneko T; Kobayashi M; Takihara T · Journal of medicinal food · 2021
    Randomized trialMental Focus Brain Health Productivity Boost forTheanine
  32. The Impact of Rhodiola Rosea Extract on Strength Performance in Alternative Bench-Press and Bench-Pull Exercises Under Resting and Mental Fatigue Conditions: A Randomized, Triple-Blinded, Placebo-Controlled, Crossover Trial.
    Marcos-Frutos D; Leban Ž; Li Z; Zhang X; Lara PM; Alix-Fages C; Jiménez-Martínez P; Zebboudji N; Caillet A; Redondo B; Vera J; Janicijevic D; García-Ramos A · Nutrients · 2025
    Randomized trial18 participantsFitness forRhodiola
  33. Acute Effects of Caffeine Supplementation on Physical Performance, Physiological Responses, Perceived Exertion, and Technical-Tactical Skills in Combat Sports: A Systematic Review and Meta-Analysis.
    Delleli S; Ouergui I; Messaoudi H; Trabelsi K; Ammar A; Glenn JM; Chtourou H · Nutrients · 2022
    Meta-analysis26 studies pooledFitness forCaffeine
  34. The combined effects of L-theanine and caffeine on cognitive performance and mood.
    Owen GN; Parnell H; De Bruin EA; Rycroft JA · Nutritional neuroscience · 2009
    Randomized trial27 participantsMental Focus forCaffeine
  35. Safety and Efficacy of AlphaWave® L-Theanine Supplementation for 28 Days in Healthy Adults with Moderate Stress: A Randomized, Double-Blind, Placebo-Controlled Trial.
    Moulin M; Crowley DC; Xiong L; Guthrie N; Lewis ED · Neurology and therapy · 2024
    Randomized trial30 participantsMental Focus Productivity Boost forTheanine
  36. Effects of short-term Rhodiola Rosea (Golden Root Extract) supplementation on anaerobic exercise performance.
    Ballmann CG; Maze SB; Wells AC; Marshall MM; Rogers RR · Journal of sports sciences · 2019
    Non-randomized trial11 participantsFitness forRhodiola
  37. A double-blind, placebo-controlled pilot study of the stimulating and adaptogenic effect of Rhodiola rosea SHR-5 extract on the fatigue of students caused by stress during an examination period with a repeated low-dose regimen.
    Spasov AA; Wikman GK; Mandrikov VB; Mironova IA; Neumoin VV · Phytomedicine : international journal of phytotherapy and phytopharmacology · 2000
    Randomized trialMental Focus Productivity Boost forRhodiola
  38. Can I Have My Coffee and Drink It? A Systematic Review and Meta-analysis to Determine Whether Habitual Caffeine Consumption Affects the Ergogenic Effect of Caffeine.
    Carvalho A; Marticorena FM; Grecco BH; Barreto G; Saunders B · Sports medicine (Auckland, N.Z.) · 2022
    Meta-analysis60 studies pooledFitness forCaffeine
  39. The effect of mouth rinsing with different concentrations of caffeine solutions on reaction time.
    Virdinli SG; Kutlay E; Yuzbasioglu Y; Vollaard NBJ; Rudarli Nalcakan G · Journal of sports sciences · 2022
    Randomized trial45 participantsMental Focus forCaffeine
  40. Effect of L-theanine on selective attention in a traffic-related reaction task in sleep-deprived young adults: a double-blind placebo-controlled, crossover study.
    Karunaratne UW; Dassanayake TL · Nutritional neuroscience · 2025
    Randomized trial24 participantsMental Focus forTheanine
  41. Effects of Short-Term Golden Root Extract (Rhodiola rosea) Supplementation on Resistance Exercise Performance.
    Williams TD; Langley HN; Roberson CC; Rogers RR; Ballmann CG · International journal of environmental research and public health · 2021
    Randomized trial10 participantsFitness forRhodiola
  42. Evidence-based efficacy of adaptogens in fatigue, and molecular mechanisms related to their stress-protective activity.
    Panossian A; Wikman G · Current clinical pharmacology · 2009
    Narrative reviewMental Focus Cognitive Support forRhodiola
  43. Sex Differences in the Ergogenic Response of Acute Caffeine Intake on Muscular Strength, Power and Endurance Performance in Resistance-Trained Individuals: A Randomized Controlled Trial.
    Montalvo-Alonso JJ; Ferragut C; Del Val-Manzano M; Valadés D; Roberts J; Pérez-López A · Nutrients · 2024
    Randomized trial76 participantsFitness forCaffeine
  44. Caffeine attenuates scopolamine-induced memory impairment in humans.
    Riedel W; Hogervorst E; Leboux R; Verhey F; van Praag H; Jolles J · Psychopharmacology · 1996
    Randomized trial16 participantsMental Focus forCaffeine
  45. L-theanine improves neurophysiological measures of attention in a dose-dependent manner: a double-blind, placebo-controlled, crossover study.
    Dassanayake TL; Kahathuduwa CN; Weerasinghe VS · Nutritional neuroscience · 2022
    Randomized trial27 participantsMental Focus forTheanine
  46. Influence of Rhodiola rosea on the heat acclimation process in young healthy men.
    Timpmann S; Hackney AC; Tamm M; Kreegipuu K; Unt E; Ööpik V · Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 2018
    Other20 participantsFitness forRhodiola
  47. The Effectiveness of Rhodiola rosea L. Preparations in Alleviating Various Aspects of Life-Stress Symptoms and Stress-Induced Conditions-Encouraging Clinical Evidence.
    Ivanova Stojcheva E; Quintela JC · Molecules (Basel, Switzerland) · 2022
    Narrative reviewMental Focus Productivity Boost forRhodiola
  48. A combination of green tea, rhodiola, magnesium and B vitamins modulates brain activity and protects against the effects of induced social stress in healthy volunteers.
    Boyle NB; Billington J; Lawton C; Quadt F; Dye L · Nutritional neuroscience · 2022
    Randomized trial100 participantsBrain Health forRhodiola
  49. Rhodiola rosea in stress induced fatigue--a double blind cross-over study of a standardized extract SHR-5 with a repeated low-dose regimen on the mental performance of healthy physicians during night duty.
    Darbinyan V; Kteyan A; Panossian A; Gabrielian E; Wikman G; Wagner H · Phytomedicine : international journal of phytotherapy and phytopharmacology · 2001
    Randomized trial56 participantsBrain Health Productivity Boost forRhodiola
  50. Effects of a Rhodiola rosea extract on mental resource allocation and attention: An event-related potential dual task study.
    Koop T; Dienel A; Heldmann M; Münte TF · Phytotherapy research : PTR · 2021
    Single-arm trial50 participantsBrain Health Cognitive Support forRhodiola
  51. Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.
    Hidese S; Ogawa S; Ota M; Ishida I; Yasukawa Z; Ozeki M; Kunugi H · Nutrients · 2020
    Randomized trial30 participantsBrain Health Cognitive Support forTheanine
  52. A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave® L-Theanine on Stress in a Healthy Adult Population.
    Evans M; McDonald AC; Xiong L; Crowley DC; Guthrie N · Neurology and therapy · 2021
    Randomized trialBrain Health forTheanine
  53. Assessing the effects of caffeine and theanine on the maintenance of vigilance during a sustained attention task.
    Foxe JJ; Morie KP; Laud PJ; Rowson MJ; de Bruin EA; Kelly SP · Neuropharmacology · 2012
    Randomized trial27 participantsBrain Health Cognitive Support forTheanine
  54. Central additive effect of Ginkgo biloba and Rhodiola rosea on psychomotor vigilance task and short-term working memory accuracy.
    Al-Kuraishy HM · Journal of intercultural ethnopharmacology · 2016
    Clinical trial112 participantsCognitive Support forRhodiola
  55. Clinical evidence for the adaptogenic effects of Withania somnifera and Rhodiola rosea - A systematic review with molecular interpretation of psychometric outcomes.
    Łuszczak J; Kocki J · Annals of agricultural and environmental medicine : AAEM · 2026
    Systematic review19 studies pooledCognitive Support forRhodiola
  56. A randomised, double-blind, placebo-controlled, parallel-group study of the standardised extract shr-5 of the roots of Rhodiola rosea in the treatment of subjects with stress-related fatigue.
    Olsson EM; von Schéele B; Panossian AG · Planta medica · 2009
    Randomized trial60 participantsCognitive Support Productivity Boost forRhodiola
  57. Cognitive and mood improvements of caffeine in habitual consumers and habitual non-consumers of caffeine.
    Haskell CF; Kennedy DO; Wesnes KA; Scholey AB · Psychopharmacology · 2005
    Randomized trial48 participantsEnergy forCaffeine
  58. Caffeine-containing energy drink improves physical performance of elite rugby players during a simulated match.
    Del Coso J; Ramírez JA; Muñoz G; Portillo J; Gonzalez-Millán C; Muñoz V; Barbero-Álvarez JC; Muñoz-Guerra J · Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 2016
    Randomized trial26 participantsEnergy forCaffeine
  59. Differential cognitive effects of energy drink ingredients: caffeine, taurine, and glucose.
    Giles GE; Mahoney CR; Brunyé TT; Gardony AL; Taylor HA; Kanarek RB · Pharmacology, biochemistry, and behavior · 2013
    Randomized trial48 participantsEnergy forCaffeine
  60. Does Single or Combined Caffeine and Taurine Supplementation Improve Athletic and Cognitive Performance without Affecting Fatigue Level in Elite Boxers? A Double-Blind, Placebo-Controlled Study.
    Ozan M; Buzdagli Y; Eyipinar CD; Baygutalp NK; Yüce N; Oget F; Kan E; Baygutalp F · Nutrients · 2022
    Randomized trial20 participantsEnergy forCaffeine
  61. Trait Energy and Fatigue Modify the Effects of Caffeine on Mood, Cognitive and Fine-Motor Task Performance: A Post-Hoc Study.
    Fuller DT; Smith ML; Boolani A · Nutrients · 2021
    Randomized trialEnergy forCaffeine
  62. Acute Effect of Citrulline Malate on Repetition Performance During Strength Training: A Systematic Review and Meta-Analysis.
    Vårvik FT; Bjørnsen T; Gonzalez AM · International journal of sport nutrition and exercise metabolism · 2021
    Meta-analysis137 participants8 studies pooledEnergy forCitrulline
  63. Oral L-citrulline supplementation enhances cycling time trial performance in healthy trained men: Double-blind randomized placebo-controlled 2-way crossover study.
    Suzuki T; Morita M; Kobayashi Y; Kamimura A · Journal of the International Society of Sports Nutrition · 2016
    Randomized trial22 participantsEnergy forCitrulline
  64. Citrulline malate enhances athletic anaerobic performance and relieves muscle soreness.
    Pérez-Guisado J; Jakeman PM · Journal of strength and conditioning research · 2010
    Randomized trial41 participantsEnergy forCitrulline
  65. Citrulline/malate promotes aerobic energy production in human exercising muscle.
    Bendahan D; Mattei JP; Ghattas B; Confort-Gouny S; Le Guern ME; Cozzone PJ · British journal of sports medicine · 2002
    Single-arm trial18 participantsEnergy forCitrulline
  66. The Effect of Citrulline Malate Supplementation on Muscle Fatigue Among Healthy Participants.
    Farney TM; Bliss MV; Hearon CM; Salazar DA · Journal of strength and conditioning research · 2019
    Randomized trial12 participantsEnergy forCitrulline
  67. Combined Effects of Rhodiola Rosea and Caffeine Supplementation on Straight Punch Explosive Power in Untrained and Trained Boxing Volunteers: A Synergistic Approach.
    Tao B; Sun H; Li H; Xu Z; Xu Y; Chen L; Ma C; Zhang X; Yu L; Bao S; Liu C · Metabolites · 2025
    Randomized trial96 participantsEnergy forRhodiola
  68. Rhodiola rosea in Subjects with Prolonged or Chronic Fatigue Symptoms: Results of an Open-Label Clinical Trial.
    Lekomtseva Y; Zhukova I; Wacker A · Complementary medicine research · 2019
    Single-arm trial100 participantsEnergy forRhodiola
  69. The Effects of Combined Exercise with Citrulline Supplementation on Body Composition and Lower Limb Function of Overweight Older Adults: A Systematic Review and Meta-Analysis.
    Xie S; Li S; Shaharudin S · Journal of sports science & medicine · 2023
    Meta-analysis303 participants7 studies pooledFitness forCitrulline
  70. Effect of High-Intensity Interval Training Combined with L-Citrulline Supplementation on Functional Capacities and Muscle Function in Dynapenic-Obese Older Adults.
    Buckinx F; Gouspillou G; Carvalho LP; Marcangeli V; El Hajj Boutros G; Dulac M; Noirez P; Morais JA; Gaudreau P; Aubertin-Leheudre M · Journal of clinical medicine · 2020
    Randomized trial56 participantsFitness Muscle Gain forCitrulline
  71. Initial Dietary Protein Intake Influence Muscle Function Adaptations in Older Men and Women Following High-Intensity Interval Training Combined with Citrulline.
    Buckinx F; Marcangeli V; Pinheiro Carvalho L; Dulac M; Hajj Boutros G; Gouspillou G; Gaudreau P; Morais J; Noirez P; Aubertin-Leheudre M · Nutrients · 2020
    Randomized trial73 participantsFitness forCitrulline
  72. Effects of Citrulline alone or combined with exercise on muscle mass, muscle strength, and physical performance among older adults: a systematic review.
    Aubertin-Leheudre M; Buckinx F · Current opinion in clinical nutrition and metabolic care · 2021
    Systematic review250 participants6 studies pooledFitness Muscle Gain forCitrulline
  73. Combined Vs. Single Supplementation of L-Citrulline and Sodium Bicarbonate During Sprint Interval Training in Basketball Players: Effects on Physical Performance and Hormonal Adaptations.
    Wang Y; Wang Y; Qian K · Journal of sports science & medicine · 2025
    Randomized trial40 participantsFitness forCitrulline
  74. Taurine supplementation enhances anaerobic power in elite speed skaters: A double-blind, randomized, placebo-controlled, crossover study.
    Buzdağlı Y; Eyipınar CD; Öget F; Şıktar E; Forbes SC; Tekin A · Biology of sport · 2023
    Randomized trial30 participantsFitness forTaurine
  75. The effect of acute taurine ingestion on 3-km running performance in trained middle-distance runners.
    Balshaw TG; Bampouras TM; Barry TJ; Sparks SA · Amino acids · 2013
    Randomized trial8 participantsFitness forTaurine
  76. Effects of different doses of taurine supplementation on repeated-sprint performance after exhaustive exercise in a high temperature and humidity environment.
    Cheng X; Lin Y; Li Z · Frontiers in nutrition · 2026
    Randomized trial16 participantsFitness forTaurine
  77. Oral taurine improves critical power and severe-intensity exercise tolerance.
    Waldron M; Patterson SD; Jeffries O · Amino acids · 2020
    Randomized trial12 participantsFitness forTaurine
  78. Acute taurine supplementation enhances thermoregulation and endurance cycling performance in the heat.
    Page LK; Jeffries O; Waldron M · European journal of sport science · 2019
    Randomized trial11 participantsFitness forTaurine
  79. Performance and alertness effects of caffeine, dextroamphetamine, and modafinil during sleep deprivation.
    Wesensten NJ; Killgore WD; Balkin TJ · Journal of sleep research · 2006
    Randomized trial48 participantsMental Focus forCaffeine
  80. Effects of caffeine on mood and performance: a study of realistic consumption.
    Brice CF; Smith AP · Psychopharmacology · 2003
    Clinical trial24 participantsMental Focus forCaffeine
  81. Effects of caffeine or diphenhydramine on visual vigilance.
    Fine BJ; Kobrick JL; Lieberman HR; Marlowe B; Riley RH; Tharion WJ · Psychopharmacology · 1995
    Randomized trial24 participantsMental Focus forCaffeine
  82. A Randomized Study to Examine the Ability of a Caffeine-Based Energy Drink to Impact Energy Expenditure, Fat Oxidation, and Cognitive Performance.
    Krieger J; Schrautemeier A; Hagele A; Gaige C; Mennemeyer O; Tolbert S; Iannotti J; Kerksick C; Noonan C; Mumford P · Nutrients · 2025
    Randomized trial60 participantsMetabolism Boost forCaffeine
  83. Oolong tea increases metabolic rate and fat oxidation in men.
    Rumpler W; Seale J; Clevidence B; Judd J; Wiley E; Yamamoto S; Komatsu T; Sawaki T; Ishikura Y; Hosoda K · The Journal of nutrition · 2001
    Randomized trial12 participantsMetabolism Boost forCaffeine
  84. Effect of caffeine intake on fat oxidation rate during exercise: is there a dose-response effect?
    Gutiérrez-Hellín J; Aguilar-Navarro M; Ruiz-Moreno C; Muñoz A; Varillas-Delgado D; Amaro-Gahete FJ; Del Coso J · European journal of nutrition · 2023
    Randomized trial18 participantsMetabolism Boost forCaffeine
  85. Comparison of changes in energy expenditure and body temperatures after caffeine consumption.
    Koot P; Deurenberg P · Annals of nutrition & metabolism · 1995
    Randomized trial12 participantsMetabolism Boost forCaffeine
  86. Caffeine Increases Work Done above Critical Power, but Not Anaerobic Work.
    Silveira R; Andrade-Souza VA; Arcoverde L; Tomazini F; Sansonio A; Bishop DJ; Bertuzzi R; Lima-Silva AE · Medicine and science in sports and exercise · 2018
    Randomized trial9 participantsMetabolism Boost forCaffeine
  87. Effects of Acute Ingestion of Caffeine Capsules on Muscle Strength and Muscle Endurance: A Systematic Review and Meta-Analysis.
    Wu W; Chen Z; Zhou H; Wang L; Li X; Lv Y; Sun T; Yu L · Nutrients · 2024
    Meta-analysis14 studies pooledMuscle Gain forCaffeine
  88. Acute caffeine intake improves muscular strength, power, and endurance performance, reversing the time-of-day effect regardless of muscle activation level in resistance-trained males: a randomized controlled trial.
    Montalvo-Alonso JJ; Del Val-Manzano M; Cerezo-Telléz E; Ferragut C; Valadés D; Rodríguez-Falces J; Pérez-López A · European journal of applied physiology · 2025
    Randomized trial13 participantsMuscle Gain forCaffeine
  89. Wake up and smell the coffee: caffeine supplementation and exercise performance-an umbrella review of 21 published meta-analyses.
    Grgic J; Grgic I; Pickering C; Schoenfeld BJ; Bishop DJ; Pedisic Z · British journal of sports medicine · 2020
    Systematic review21 studies pooledMuscle Gain forCaffeine
  90. Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis.
    Grgic J; Trexler ET; Lazinica B; Pedisic Z · Journal of the International Society of Sports Nutrition · 2018
    Meta-analysis20 studies pooledMuscle Gain forCaffeine
  91. Caffeine increases strength and power performance in resistance-trained females during early follicular phase.
    Norum M; Risvang LC; Bjørnsen T; Dimitriou L; Rønning PO; Bjørgen M; Raastad T · Scandinavian journal of medicine & science in sports · 2021
    Randomized trial15 participantsMuscle Gain forCaffeine
  92. Impact of L-citrulline supplementation and whole-body vibration training on arterial stiffness and leg muscle function in obese postmenopausal women with high blood pressure.
    Figueroa A; Alvarez-Alvarado S; Ormsbee MJ; Madzima TA; Campbell JC; Wong A · Experimental gerontology · 2015
    Randomized trial41 participantsMuscle Gain forCitrulline
  93. Citrulline Supplementation Improves Microvascular Function and Muscle Strength in Middle-Aged and Older Adults with Type 2 Diabetes.
    Figueroa A; Dillon KN; Levitt DE; Kang Y · Nutrients · 2025
    Randomized trial16 participantsMuscle Gain forCitrulline
  94. Citrulline stimulates muscle protein synthesis in the post-absorptive state in healthy people fed a low-protein diet - A pilot study.
    Jourdan M; Nair KS; Carter RE; Schimke J; Ford GC; Marc J; Aussel C; Cynober L · Clinical nutrition (Edinburgh, Scotland) · 2016
    Randomized trial8 participantsMuscle Gain forCitrulline
  95. Effects of caffeine on alertness.
    Zwyghuizen-Doorenbos A; Roehrs TA; Lipschutz L; Timms V; Roth T · Psychopharmacology · 1990
    Randomized trial24 participantsProductivity Boost forCaffeine
  96. Effects of Different Sources of Low-Dose Caffeine on Mood/Arousal and Cognitive Performance.
    Irwin C; McCartney D; Grant G; Delang N; Bartrim K; Cox GR; Desbrow B · Perceptual and motor skills · 2023
    Randomized trial22 participantsProductivity Boost forCaffeine
  97. Effects of caffeine, sleep loss, and stress on cognitive performance and mood during U.S. Navy SEAL training. Sea-Air-Land.
    Lieberman HR; Tharion WJ; Shukitt-Hale B; Speckman KL; Tulley R · Psychopharmacology · 2003
    Randomized trial68 participantsProductivity Boost forCaffeine
  98. A review of caffeine's effects on cognitive, physical and occupational performance.
    McLellan TM; Caldwell JA; Lieberman HR · Neuroscience and biobehavioral reviews · 2017
    Narrative reviewProductivity Boost forCaffeine
  99. Acute caffeine supplementation as a nutrition-based strategy to mitigate sleep-loss-related cognitive and operational performance impairments in military personnel: a systematic review and meta-analysis.
    Wang R; Wang W; Meng L; Hao G; Gu G · Frontiers in nutrition · 2026
    Meta-analysis7 studies pooledProductivity Boost forCaffeine
  100. Cognitive and affective effects of L-Theanine: a systematic review and meta-analysis of 31 randomized trials.
    Gerolymos C; Saddier E; Boyer L; Fond G · Molecular psychiatry · 2026
    Meta-analysis1,168 participants31 studies pooledProductivity Boost forTheanine
  101. Effects of L-theanine on cognition, mood and sleep: evidence from human trials.
    Cotter J; Kilpatrick HE · Frontiers in nutrition · 2026
    Narrative reviewProductivity Boost forTheanine
  102. Changes in caffeine intake and long-term weight change in men and women.
    Lopez-Garcia E; van Dam RM; Rajpathak S; Willett WC; Manson JE; Hu FB · The American journal of clinical nutrition · 2006
    Cohort study58,157 participantsWeight Loss forCaffeine
  103. Does caffeine ingestion before a short-term sprint interval training promote body fat loss?
    Ferreira GA; Felippe LC; Bertuzzi R; Bishop DJ; Ramos IS; De-Oliveira FR; Lima-Silva AE · Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas · 2020
    Randomized trial20 participantsWeight Loss forCaffeine
  104. Eight Weeks of Sprint Interval Training With Adding Caffeine Ingestion Leads to Greater Improvements in Health-Related Physiological Parameters in Obese Male Adults.
    Zhiang J; Song Q · Physiological research · 2026
    Randomized trial30 participantsWeight Loss forCaffeine
  105. Caffeine treatment prevented from weight regain after calorie shifting diet induced weight loss.
    Davoodi SH; Hajimiresmaiel SJ; Ajami M; Mohseni-Bandpei A; Ayatollahi SA; Dowlatshahi K; Javedan G; Pazoki-Toroudi H · Iranian journal of pharmaceutical research : IJPR · 2014
    Non-randomized trial60 participantsWeight Loss forCaffeine
  106. The effects of caffeine intake on weight loss: a systematic review and dos-response meta-analysis of randomized controlled trials.
    Tabrizi R; Saneei P; Lankarani KB; Akbari M; Kolahdooz F; Esmaillzadeh A; Nadi-Ravandi S; Mazoochi M; Asemi Z · Critical reviews in food science and nutrition · 2020
    Meta-analysis606 participants13 studies pooledWeight Loss forCaffeine