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Pre-Workout Blood Raz

Bucked Up
4.6
★ ★ ★ ★ ★
(35 ratings)
Caffeine 200 mg
Alpha-GPC 200 mg
Product Image
Score66
A well-dosed citrulline and caffeine pre-workout with good training utility, weakened by modest focus ingredients and low-value specialty additions.
How scoring works
Quantity:10 Liquid(s) • (30 servings)
Goals:
Energy
Fitness
Weight Loss
Metabolism Boost
Mental Focus
Productivity Boost
Muscle Gain

Score 66

A well-dosed citrulline and caffeine pre-workout with good training utility, weakened by modest focus ingredients and low-value specialty additions.
How scoring works

Also available as

2 options
11 servings • Blue Raz Caffeine 200 mg, Alpha-GPC 200 mg • 11 Liquid(s) • 30 servings $42.95 ($1.43 per serving) 11 servings • Watermelon Caffeine 200 mg, Alpha-GPC 200 mg • 11 Liquid(s) • 30 servings $42.95 ($1.43 per serving)
$42.95($1.43 per serving)
iHerb
$ 42.95
Report prices

Analysis

Citrulline malate anchors the formula for blood-flow and training support, while caffeine and beta-alanine address energy and repeated-effort performance. The combination is more convincing for workouts than for weight loss or all-day productivity.

Major ingredients are fully disclosed, which makes the blend easy to assess. Alpha-GPC is modest, taurine is very small, and the label does not state the glycerophosphocholine yield from the branded Alpha-GPC material.

Adults seeking a stimulating pre-workout with a strong pump ingredient may find it useful. Caffeine-sensitive users and tested athletes who prefer to avoid deer antler ingredients should choose a simpler alternative.

Who is it for
  • Adults seeking a stimulating pump-focused pre-workout
  • Regular caffeine users training for strength or conditioning
Best for
  • Workout energy and blood-flow support
  • Moderate beta-alanine performance support

Pros

  • Strong citrulline malate amount
  • Clearly disclosed caffeine
  • Useful beta-alanine amount
  • No proprietary blend hides the main doses

Cons

  • Alpha-GPC amount is modest
  • Taurine amount is very small
  • Deer antler extract adds uncertain value
  • Premium serving cost

Warnings

  • Caffeine may cause jitteriness, rapid heartbeat, or sleep disruption
  • Beta-alanine can cause harmless but uncomfortable tingling
  • Avoid combining with other stimulant pre-workouts
  • Tested athletes may prefer to avoid deer antler ingredients because sporting-body rules and product risk can vary

Nutrient quality

73 High impact

Meaningful citrulline and caffeine provide a useful pre-workout core. Underdosed supporting actives and several tiny additions reduce formula efficiency.

.

Ingredient transparency

84 Highest impact

All active amounts are visible without a hidden blend. Complete directions, inactive ingredients, and Alpha-GPC active yield remain missing.

.

Customer satisfaction

57 Moderate impact

The supplied average is strong and based on a small sample. No review themes were provided, so consistency and purpose-specific experience cannot be assessed.

.

Value for money

40 Lower impact

The strong citrulline and caffeine core provides some value. A high serving cost and several low-dose extras make the formula weakly competitive.

.
Report analysis

Goals

Energy
Physical Stamina
Energy
Impact
Highest effect
A+ Goal FitA Strength of SupportA- CoverageB- Formula Quality
Vitamin B12 · 100 mcgCaffeine · 200 mg

Caffeine provides predictable acute alertness, while citrulline malate and beta-alanine support workout performance through separate mechanisms. Alpha-GPC adds a focus-oriented pathway, making the formula broader than a stimulant alone.

The main performance amounts are fully disclosed and several are meaningful, though taurine and vitamin B12 are modest for their respective roles. No theanine or sustained-release caffeine is included, and deer velvet plus small botanical blends add uncertain value.

Study evidence
Caffeine Supportive 68 studies
Fitness
Fitness
Impact
Highest effect
A Goal FitA- Strength of SupportA- CoverageB- Formula Quality
Beta-Alanine · 2000 mgCaffeine · 200 mg

Citrulline malate, beta-alanine, and caffeine directly support blood flow, high-intensity capacity, and training focus. The main doses are clearly disclosed and align reasonably well with common pre-workout use.

Beta-alanine is somewhat below a full daily target, while taurine, Alpha-GPC, and the botanical extras are lightly dosed. The moderate caffeine amount can still cause jitters, sleep disruption, or a faster heart rate in stimulant-sensitive users.

Study evidence
Caffeine Supportive 255 studies
Taurine Supportive 21 studies
Weight Loss
Weight Loss
Impact
Highest effect
A- Goal FitA- Strength of SupportC+ CoverageB Formula Quality
Caffeine · 200 mg

Caffeine may modestly increase energy expenditure and supports training performance during a calorie deficit. Citrulline and beta-alanine support exercise rather than appetite, so the formula does not address satiety or dietary adherence.

Caffeine, citrulline malate, beta-alanine, methylcobalamin, and alpha-GPC have clear amounts and several branded sources. Deer velvet and multiple tiny botanical blends add weakly supported label complexity without improving the main weight-loss mechanisms. Caffeine at 200 mg may cause anxiety, rapid heartbeat, or sleep disruption in sensitive users, especially when combined with other stimulants.

Study evidence
Caffeine Disputed 14 studies
Metabolism Boost
Metabolism Boost
Impact
High effect
A Goal FitA Strength of SupportC- CoverageD+ Formula Quality
Vitamin B12 · 100 mcgCaffeine · 200 mg

Caffeine provides a direct and predictable short-term increase in energy expenditure. The rest of the pre-workout is designed mainly for exercise performance rather than sustained metabolic support.

The clearly stated caffeine amount is well aligned with an effective stimulant serving. Deer antler, low-dose taurine, and several performance additions dilute focus without adding a meaningful metabolic pathway.

Study evidence
Caffeine Disputed 40 studies
Taurine Supportive 11 studies
Mental Focus
Mental Focus
Impact
High effect
B+ Goal FitB Strength of SupportC+ CoverageD+ Formula Quality
Vitamin B12 · 100 mcgAlpha-GPC · 200 mgCaffeine · 200 mg

Caffeine provides a dependable 200 mg acute alertness effect, while AlphaSize Alpha-GPC may add cholinergic support. The listed 200 mg Alpha-GPC material likely provides less active Alpha-GPC than preferred cognitive amounts.

Most of the remaining formula serves exercise performance rather than mental focus. Caffeine can cause jitteriness, anxiety, a faster heartbeat, or sleep disruption, and the absence of L-theanine offers no built-in calming balance.

Study evidence
Alpha-GPC Supportive 1 study
Caffeine Supportive 128 studies
Productivity Boost
Productivity Boost
Impact
High effect
B+ Goal FitB Strength of SupportC CoverageC- Formula Quality
Vitamin B12 · 100 mcgVitamin B12 · 100 mcgAlpha-GPC · 200 mgCaffeine · 200 mg

Caffeine provides reliable acute alertness, while Alpha-GPC adds a relevant but underdosed cholinergic component. The pre-workout format favors exercise performance more than balanced, sustained productivity.

The 200 mg caffeine amount is clearly disclosed and predictable. Estimated active Alpha-GPC remains below the preferred range, and caffeine may cause jitteriness or disrupt sleep in sensitive users.

Study evidence
Alpha-GPC Supportive 2 studies
Caffeine Supportive 108 studies
Muscle Gain
Muscle Gain
Impact
High effect
B Goal FitC+ Strength of SupportB- CoverageC- Formula Quality
Caffeine · 200 mgBeta-Alanine · 2000 mg

Citrulline malate, beta-alanine, and caffeine can support training volume, but the formula lacks protein or a fully dosed anabolic staple. Human evidence supports the main pre-workout ingredients for performance, while deer antler velvet and the small botanical additions lack convincing hypertrophy evidence.

Citrulline is reasonably substantial, while beta-alanine is below a typical full daily amount and several secondary actives are token doses. The core pre-workout combination is logical for training performance. Caffeine may cause jitteriness or disturb sleep in sensitive users.

Study evidence
Alpha-GPC Not classified 1 study
Caffeine Supportive 31 studies
Taurine Not classified

No linked studies yet.

Ingredients

IngredientAmount per serving
Vitamin B12 (Methylcobalamin)
 100 mcg
Citrulline Malate
6000 mg
CarnoSyn (Beta-Alanine)
 2000 mg
Caffeine Anhydrous
200 mg
AlphaSize Alpha GPC
200 mg
Taurine
100 mg
Himalayan Rock Salt (Trace Minerals)
 100 mg
Deer Antler Velvet extract
50 mg
AstraGin (Astragalus, Panax notoginseng)
 25 mg
ActiGin (Panax notoginseng, Rosa roxburghii)
 25 mg
Adults 18–50 Women
Report overview
Caffeine · 200 mg OverallScore72
B Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyF Value

A clearly disclosed 200 mg caffeine anhydrous dose provides a predictable, moderate stimulant effect. The formula lacks sustained-release caffeine, while its other performance ingredients do not add a high-potency stimulant. Very high serving cost weakens economic value despite the strong caffeine specification.

View ingredientView products
Alpha-GPC · 200 mg OverallScore50
C+ Active Ingredient Quality & BioavailabilityF Dose, Safety & Label TransparencyD- Value

AlphaSize provides a recognized branded form, but the listed 200 mg does not clarify active yield. Assuming 50% yield, the estimated 100 mg active amount falls below the preferred range. The included 200 mg caffeine may cause jitteriness or disrupt sleep in stimulant-sensitive users.

View ingredientView products
Loading alternative details
77 Performance

Pulse Fruit Punch

Legion
<p>Full pre-workout amounts of citrulline malate, beta-alanine, betaine, theanine, Alpha-GPC, and caffeine create excellent performance depth. Compared with Pre-Workout Blood Raz, the disclosed delivery approach and ingredient profile provide a useful quality-focused alternative, although the noted limitations prevent a definitive advantage for every user.</p>
72 Performance

Seventh Gear Your Mom's Lemonade

Axe & Sledge Supplements
<p>Multiple stimulant forms create strong energy support, while beta-alanine, betaine, creatine, and Alpha-GPC are below common full performance amounts. Compared with Pre-Workout Blood Raz, the disclosed delivery approach and ingredient profile provide a useful quality-focused alternative, although the noted limitations prevent a definitive advantage for every user.</p>
71 Performance

High-Performance Pre-Workout Black Cherry

Pre JYM
<p>Citrulline, amino acids, tyrosine, caffeine, and several performance compounds create broad pre-workout depth with fully listed amounts. Compared with Pre-Workout Blood Raz, the disclosed delivery approach and ingredient profile provide a useful quality-focused alternative, although the noted limitations prevent a definitive advantage for every user.</p>
87 Budget

Caffeine 200 mg

ALLMAX
<p>A clearly disclosed stimulant dose provides reliable short-term energy and focus at a very low serving cost. Its lower recurring cost makes it a more accessible formula option than Pre-Workout Blood Raz, while the stated formula limitations still matter.</p>
82 Budget

High Caffeine 200 mg

Natrol
<p>A clearly disclosed stimulant dose provides reliable short-term energy and focus at a very low serving cost. Its lower recurring cost makes it a more accessible formula option than Pre-Workout Blood Raz, while the stated formula limitations still matter.</p>
82 Budget

Caffeine 200 mg

Best Naturals
<p>A clearly disclosed stimulant dose provides reliable short-term energy and focus at a very low serving cost. Its lower recurring cost makes it a more accessible formula option than Pre-Workout Blood Raz, while the stated formula limitations still matter.</p>
84 Value

L-Theanine & Caffeine

SR Sports Research
<p>A well-balanced theanine and green-coffee caffeine pairing supports calm alertness with clear amounts. Its lower recurring cost and clearly described formula strengths offer a practical quality-to-cost trade-off versus Pre-Workout Blood Raz, with the noted gaps as the main caveat.</p>
84 Value

Smart Caffeine with L-Theanine

NS Natural Stacks
<p>A simple two-to-one theanine-to-green-coffee caffeine pairing provides practical calm-focus dosing. Its lower recurring cost and clearly described formula strengths offer a practical quality-to-cost trade-off versus Pre-Workout Blood Raz, with the noted gaps as the main caveat.</p>
81 Value

Natural Caffeine

BodyTech
<p>A clearly disclosed stimulant dose provides reliable short-term energy and focus at a very low serving cost. Its lower recurring cost and clearly described formula strengths offer a practical quality-to-cost trade-off versus Pre-Workout Blood Raz, with the noted gaps as the main caveat.</p>
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. Effects of Caffeine Intake on Cognitive Performance Related to Total Sleep Deprivation and Time on Task: A Randomized Cross-Over Double-Blind Study.
    Quiquempoix M; Sauvet F; Erblang M; Van Beers P; Guillard M; Drogou C; Trignol A; Vergez A; Léger D; Chennaoui M; Gomez-Merino D; Rabat A · Nature and science of sleep · 2022
    Randomized trial24 participantsEnergy Productivity Boost forCaffeine
  3. Caffeine administration at night during extended wakefulness effectively mitigates performance impairment but not subjective assessments of fatigue and sleepiness.
    Paech GM; Banks S; Pajcin M; Grant C; Johnson K; Kamimori GH; Vedova CB · Pharmacology, biochemistry, and behavior · 2017
    Randomized trial24 participantsEnergy forCaffeine
  4. High-power therapeutic ultrasound for treatment of abdominal localized adiposity-double-blind randomized clinical trial.
    da Silva Siqueira K; Maia JM · Lasers in medical science · 2020
    Randomized trial90 participantsWeight Loss forCaffeine
  5. Effects of Acute Caffeine Ingestion on Cognitive Performance before and after Repeated Small-Sided Games in Professional Soccer Players: A Placebo-Controlled, Randomized Crossover Trial.
    de Almeida RF; de Oliveira M; Furigo IC; Aquino R; Clarke ND; Tallis J; Guimaraes-Ferreira L · Nutrients · 2023
    Randomized trial12 participantsProductivity Boost forCaffeine
  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 participantsEnergy Fitness forCaffeine
  7. Maternal, but not paternal or grandparental, caffeine intake is associated with childhood obesity and adiposity: The Lifeways Cross-Generation Cohort Study.
    Chen LW; Murrin CM; Mehegan J; Kelleher CC; Phillips CM; Cross-Generation Cohort Study for the Lifeways · The American journal of clinical nutrition · 2020
    Cohort study558 participantsWeight Loss forCaffeine
  8. Association of the anxiogenic and alerting effects of caffeine with ADORA2A and ADORA1 polymorphisms and habitual level of caffeine consumption.
    Rogers PJ; Hohoff C; Heatherley SV; Mullings EL; Maxfield PJ; Evershed RP; Deckert J; Nutt DJ · Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2010
    Randomized trial379 participantsProductivity Boost forCaffeine
  9. A critical review of caffeine withdrawal: empirical validation of symptoms and signs, incidence, severity, and associated features.
    Juliano LM; Griffiths RR · Psychopharmacology · 2005
    Systematic review66 studies pooledEnergy forCaffeine
  10. Safety and efficacy of long-term treatment with ephedrine, caffeine and an ephedrine/caffeine mixture.
    Toubro S; Astrup AV; Breum L; Quaade F · International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity · 1993
    Randomized trial180 participantsWeight Loss forCaffeine
  11. 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
  12. 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
  13. Limited Efficacy of Caffeine and Recovery Costs During and Following 5 Days of Chronic Sleep Restriction.
    Doty TJ; So CJ; Bergman EM; Trach SK; Ratcliffe RH; Yarnell AM; Capaldi VF; Moon JE; Balkin TJ; Quartana PJ · Sleep · 2018
    Clinical trial48 participantsProductivity Boost forCaffeine
  14. 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
  15. 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
  16. 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
  17. Effects of caffeine and glucose, alone and combined, on cognitive performance.
    Adan A; Serra-Grabulosa JM · Human psychopharmacology · 2010
    Randomized trial72 participantsProductivity Boost forCaffeine
  18. 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
  19. 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
  20. 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
  21. Caffeine reversal of sleep deprivation effects on alertness and mood.
    Penetar D; McCann U; Thorne D; Kamimori G; Galinski C; Sing H; Thomas M; Belenky G · Psychopharmacology · 1995
    Randomized trial50 participantsProductivity Boost forCaffeine
  22. 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
  23. An Examination of a Novel Weight Loss Supplement on Anthropometry and Indices of Cardiovascular Disease Risk.
    Sowinski RJ; Grubic TJ; Dalton RL; Schlaffer J; Reyes-Elrod AG; Jenkins VM; Williamson S; Rasmussen C; Murano PS; Earnest CP; Kreider RB · Journal of dietary supplements · 2021
    Randomized trial68 participantsWeight Loss forCaffeine
  24. 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
  25. 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
  26. Effect of Caffeine on Golf Performance and Fatigue during a Competitive Tournament.
    Mumford PW; Tribby AC; Poole CN; Dalbo VJ; Scanlan AT; Moon JR; Roberts MD; Young KC · Medicine and science in sports and exercise · 2016
    Randomized trial12 participantsEnergy forCaffeine
  27. Maternal caffeine intake during pregnancy, early growth, and body fat distribution at school age.
    Voerman E; Jaddoe VW; Gishti O; Hofman A; Franco OH; Gaillard R · Obesity (Silver Spring, Md.) · 2017
    Cohort study7,857 participantsWeight Loss forCaffeine
  28. 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
  29. Caffeine and Cognitive Functions in Sports: A Systematic Review and Meta-Analysis.
    Lorenzo Calvo J; Fei X; Domínguez R; Pareja-Galeano H · Nutrients · 2021
    Meta-analysis13 studies pooledProductivity Boost forCaffeine
  30. Prenatal Substance Exposure and Obesity: Trajectories of Tri-Ponderal Mass Index in Early Adolescence.
    Li R; Wigley IM; Suuronen I; Jolly A; Tuulari JJ · American journal of preventive medicine · 2025
    Cohort study7,881 participantsWeight Loss forCaffeine
  31. 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
  32. Effect of three caffeine doses on plasma catecholamines and alertness during prolonged wakefulness.
    Kamimori GH; Penetar DM; Headley DB; Thorne DR; Otterstetter R; Belenky G · European journal of clinical pharmacology · 2001
    Randomized trial50 participantsProductivity Boost forCaffeine
  33. Caffeine Supplementation and Physical Performance, Muscle Damage and Perception of Fatigue in Soccer Players: A Systematic Review.
    Mielgo-Ayuso J; Calleja-Gonzalez J; Del Coso J; Urdampilleta A; León-Guereño P; Fernández-Lázaro D · Nutrients · 2019
    Systematic review17 participants17 studies pooledEnergy forCaffeine
  34. 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
  35. 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
  36. 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 participantsProductivity Boost Energy forCaffeine
  37. 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 participantsEnergy Metabolism Boost forCaffeine
  38. Interventions associated with brown adipose tissue activation and the impact on energy expenditure and weight loss: A systematic review.
    Perez LC; Perez LT; Nene Y; Umpierrez GE; Davis GM; Pasquel FJ · Frontiers in endocrinology · 2022
    Systematic review47 studies pooledWeight Loss forCaffeine
  39. 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
  40. 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
  41. 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
  42. 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
  43. Oral taurine improves critical power and severe-intensity exercise tolerance.
    Waldron M; Patterson SD; Jeffries O · Amino acids · 2020
    Randomized trial12 participantsFitness forTaurine
  44. 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
  45. Acute Alpha-Glycerylphosphorylcholine Supplementation Enhances Cognitive Performance in Healthy Men.
    Kerksick CM · Nutrients · 2024
    Randomized trial20 participantsMental Focus Productivity Boost forAlpha-GPC
  46. 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
  47. 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
  48. 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
  49. Effects of caffeine on mood and performance: a study of realistic consumption.
    Brice CF; Smith AP · Psychopharmacology · 2003
    Clinical trial24 participantsMental Focus forCaffeine
  50. 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
  51. 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
  52. 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
  53. 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
  54. 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
  55. Taurine supplementation as a therapeutic strategy for cellular senescence and chronic inflammation in long COVID: a systematic review and meta-analysis.
    Wang K; Ma CH; Khoramjoo M; Kung JY; Oudit GY · BMC infectious diseases · 2026
    Meta-analysis1,030 participants27 studies pooledMetabolism Boost forTaurine
  56. Effect of Long-Term Taurine Supplementation on the Lipid and Glycaemic Profile in Adults with Overweight or Obesity: A Systematic Review and Meta-Analysis.
    Sun Q; Wang J; Wang H; Yu H; Wan K; Ma F; Wang R · Nutrients · 2025
    Meta-analysis9 studies pooledMetabolism Boost forTaurine
  57. The effects of taurine supplementation on obesity, blood pressure and lipid profile: A meta-analysis of randomized controlled trials.
    Guan L; Miao P · European journal of pharmacology · 2021
    Meta-analysis12 studies pooledMetabolism Boost forTaurine
  58. Beneficial effects of taurine on serum lipids in overweight or obese non-diabetic subjects.
    Zhang M; Bi LF; Fang JH; Su XL; Da GL; Kuwamori T; Kagamimori S · Amino acids · 2005
    Randomized trial30 participantsMetabolism Boost forTaurine
  59. Use of skeletal muscle fiber composition to assess relationship between amino acid metabolism and insulin sensitivity.
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    Zwyghuizen-Doorenbos A; Roehrs TA; Lipschutz L; Timms V; Roth T · Psychopharmacology · 1990
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  68. Effects of caffeine, sleep loss, and stress on cognitive performance and mood during U.S. Navy SEAL training. Sea-Air-Land.
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