Product Image

Ripped Fuel Extreme

Twinlab
4.0
★ ★ ★ ★ ★
(107 ratings)
Caffeine 220 mg
Chromium 200 mcg
Product Image
Score52
A strong but opaque stimulant blend with enough label ambiguity and overlap to make effects and risks hard to predict.
How scoring works
Quantity:60 Capsule(s) • (30 servings)
Goals:
Metabolism Boost
Weight Loss
Fitness
Energy

Score 52

A strong but opaque stimulant blend with enough label ambiguity and overlap to make effects and risks hard to predict.
How scoring works
$21.99($0.73 per serving)
Pure Formulas
$ 21.99
Vitacost
$ 24.19
iHerb
$ 21.99
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Analysis

The clearly listed 220 mg caffeine amount can produce strong short-term alertness and workout energy. Chromium picolinate and cayenne add plausible glucose-handling and thermogenic pathways.

Cocoa-derived caffeine, theobromine, phenylethylamine, and tyramine appear alongside repeated caffeine entries, making the true total stimulant profile hard to interpret. Two proprietary herbal extracts further prevent dose and interaction assessment, while 13 mg carnitine is too small to matter.

The capsule may feel intense but is poorly designed for smooth focus or reliable long-term weight management. It lacks a calming ingredient and offers almost no direct muscle-building or recovery support.

Who is it for
  • Experienced stimulant users only
  • Adults seeking short-term workout energy
  • People who can avoid all other caffeine sources
Best for
  • Acute stimulant energy
  • Short-term alertness
  • Thermogenic support

Pros

  • Provides an active caffeine amount
  • Uses chromium picolinate
  • Includes cayenne
  • Discloses some main active amounts

Cons

  • Total stimulant load is unclear
  • Contains proprietary herbal extracts
  • Carnitine is token dosed
  • No calming counterbalance

Warnings

  • The disclosed caffeine plus cocoa stimulants may cause anxiety, jitteriness, rapid heartbeat, blood-pressure elevation, or sleep disruption; do not combine with other stimulants.
  • The tyramine-containing cocoa extract may be unsafe with monoamine oxidase inhibitor medicines, and the unclear amount requires medication-specific professional review.
  • People with uncontrolled high blood pressure, an arrhythmia, or marked stimulant sensitivity should avoid this formula.

Nutrient quality

60 Moderate impact

Caffeine anhydrous and chromium picolinate are recognizable forms that fit stimulant and metabolic use. Multiple stimulant sources, a very small carnitine amount, and aggressive exposure weaken balance and safety.

.

Ingredient transparency

43 Lower impact

The main active amounts are mostly visible, making the core formula possible to assess. Serving directions and non-active ingredients are missing, and any named blend further limits clarity.

.

Customer satisfaction

58 Moderate impact

The supplied average is positive but mixed and the response volume is limited. No detailed feedback is provided to assess recurring complaints or fit with the intended purpose.

.

Value for money

51 Moderate impact

The formula provides active stimulant amounts but only middling value for its complexity. Underdosed carnitine and unclear overlapping stimulant entries reduce useful value.

.
Report analysis

Goals

Metabolism Boost
Metabolism Boost
Impact
High effect
A Goal FitC+ Strength of SupportB- CoverageC Formula Quality
Green Tea · 315 ngCaffeine · 220 mg

Caffeine and chromium provide direct support for thermogenesis and carbohydrate handling, while cayenne adds another plausible metabolic pathway. The caffeine amount is effective, but the tiny L-carnitine amount is unlikely to add meaningful mitochondrial transport support.

Several stimulant compounds and proprietary herbal extracts make the active profile harder to interpret. The disclosed caffeine, theobromine, phenylethylamine, and tyramine may increase jitteriness, sleep disruption, or a rapid heartbeat in stimulant-sensitive users.

Study evidence
Caffeine Disputed 40 studies
Chromium Supportive 47 studies
Weight Loss
Weight Loss
Impact
High effect
B- Goal FitB- Strength of SupportB- CoverageC- Formula Quality
Green Tea · 315 ngCaffeine · 220 mg

Caffeine provides a direct thermogenic and workout-energy effect, while chromium offers situational support for glucose-related cravings. Green tea, cayenne, and other stimulatory compounds broaden the approach, but several active amounts are difficult to interpret.

The disclosed caffeine amount is effective, though cocoa-derived stimulants and proprietary extracts make the total stimulant profile less clear. The combination may cause jitters, rapid heartbeat, or sleep disruption in stimulant-sensitive users.

Study evidence
Caffeine Disputed 14 studies
Chromium No effect 24 studies
Green Tea Supportive 42 studies
Fitness
Fitness
Impact
High effect
B+ Goal FitC+ Strength of SupportC CoverageD+ Formula Quality
Caffeine · 220 mg

Caffeine provides strong acute training energy, but the formula is more thermogenic than performance-focused. The 13 mg L-carnitine amount is too small to add useful fuel or recovery support.

Several cocoa stimulants and proprietary extracts make the full stimulant load difficult to judge. The disclosed caffeine plus theobromine, phenylethylamine, and tyramine may increase jitteriness or a rapid heartbeat in sensitive users.

Study evidence
Caffeine Supportive 255 studies
L-Carnitine Supportive 52 studies
Energy
Energy
Impact
High effect
A- Goal FitB Strength of SupportD CoverageF Formula Quality
Caffeine · 220 mg

Caffeine can increase acute alertness, and the disclosed 220 mg amount is firmly active. Cocoa stimulants add theobromine, phenylethylamine, and tyramine, creating a stronger but less predictable stimulant profile.

The formula offers little metabolic or stress-resilience support beyond stimulation, while low-dose carnitine is unlikely to add meaningful depth. Combining the caffeine with other caffeine sources may increase jitteriness, rapid heartbeat, blood-pressure elevation, or sleep disruption.

Study evidence
Caffeine Supportive 68 studies
Productivity Boost
Productivity Boost
Impact
Moderate effect
B Goal FitB- Strength of SupportC- CoverageF Formula Quality
Caffeine · 220 mg

Caffeine can provide a clear short-term increase in alertness and attention. The stated 220 mg amount is substantial, but the label repeats caffeine across several sources and also lists other cocoa stimulants.

No calming agent such as theanine is present to moderate jitters, and multiple stimulant compounds may worsen sleep or anxiety. Weight-loss extracts, chromium, carnitine, and cayenne add little to mental productivity.

Study evidence
Caffeine Supportive 108 studies
Mental Focus
Mental Focus
Impact
Moderate effect
B Goal FitC- Strength of SupportF CoverageF Formula Quality
Caffeine · 220 mg

The high caffeine amount can strongly increase alertness, but several stimulant-like cocoa compounds make the effect harder to predict. The formula is designed for intense energy and weight management rather than smooth, sustained focus.

Multiple overlapping stimulant sources raise the likelihood of jitters, a faster heartbeat, or sleep disruption. Stimulant-sensitive users should avoid combining the serving with other caffeine because the total load is already substantial.

Study evidence
Caffeine Supportive 128 studies

Ingredients

IngredientAmount per serving
Calcium (Calcium Carbonate)
 118 mg
Chromium (Chromium Picolinate)
 200 mcg
Proprietary Herbal extract (Free B-Ring Flavonoids, Flavans)
 125 mg
Cocoa seed extract (Caffeine, Phenylethylamine, Theobromine, Tyramine)
 315 mg
Green Tea Leaf Extract (Caffeine, Epigallocatechin Gallate)
 315 ng
Caffeine (Green Tea Leaf Extract, Caffeine Anhydrous, Cocoa Seed Extract)
 220 mg
L-Carnitine (L-Carnitine L-Tartrate)
 13 mg
Cayenne Fruit Extract
50 mg
Adults 18–50 Women
Report overview
Chromium (Chromium Picolinate) · 200 mcg OverallScore70
B- Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyD- Value
Chromium picolinate provides a well-absorbed form at a targeted amount for metabolic support. The label does not separate elemental chromium from compound weight and gives no recognized branded source, which weakens transparency. The formula is costly for its chromium contribution, and the listed 220 mg caffeine dose may cause jitters, sleep disruption, or a faster heartbeat in sensitive users.
View ingredientView products
Caffeine (Green Tea Leaf Extract, Caffeine Anhydrous, Cocoa Seed Extract) · 220 mg OverallScore70
B Active Ingredient Quality & BioavailabilityB- Dose, Safety & Label TransparencyC Value

The caffeine dose is clearly in an effective range and includes the well-defined anhydrous form, but no controlled-release technology is identified. Several caffeine sources and cocoa-related stimulants make the stimulant profile harder to interpret. The disclosed caffeine plus phenylethylamine, theobromine, and tyramine may intensify jitteriness or rapid heartbeat in stimulant-sensitive users.

View ingredientView products
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Report alternatives

Sources

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. Systematic review and meta-analysis of the efficacy and safety of chromium supplementation in diabetes.
    Suksomboon N; Poolsup N; Yuwanakorn A · Journal of clinical pharmacy and therapeutics · 2015
    Meta-analysis25 studies pooledMetabolism Boost forChromium
  13. The Effects of Supplementation with Chromium on Insulin Resistance Indices in Women with Polycystic Ovarian Syndrome: A Systematic Review and Meta-Analysis of Randomized Clinical Trials.
    Heshmati J; Omani-Samani R; Vesali S; Maroufizadeh S; Rezaeinejad M; Razavi M; Sepidarkish M · Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme · 2018
    Meta-analysis268 participants5 studies pooledMetabolism Boost forChromium
  14. Improved meta-analytic methods show no effect of chromium supplements on fasting glucose.
    Bailey CH · Biological trace element research · 2014
    Meta-analysis809 participants16 studies pooledMetabolism Boost forChromium
  15. Chromium supplementation in non-obese non-diabetic subjects is associated with a decline in insulin sensitivity.
    Masharani U; Gjerde C; McCoy S; Maddux BA; Hessler D; Goldfine ID; Youngren JF · BMC endocrine disorders · 2013
    Randomized trial31 participantsMetabolism Boost forChromium
  16. 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
  17. 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
  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. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. A systematic review and meta-analysis of propionyl-L-carnitine effects on exercise performance in patients with claudication.
    Brass EP; Koster D; Hiatt WR; Amato A · Vascular medicine (London, England) · 2013
    Meta-analysis13 studies pooledFitness forL-Carnitine
  25. Oral acetyl-L-carnitine therapy reduces fatigue in overt hepatic encephalopathy: a randomized, double-blind, placebo-controlled study.
    Malaguarnera M; Vacante M; Giordano M; Pennisi G; Bella R; Rampello L; Malaguarnera M; Li Volti G; Galvano F · The American journal of clinical nutrition · 2011
    Randomized trial121 participantsFitness forL-Carnitine
  26. Prolonged oral L-carnitine substitution increases bicycle ergometer performance in patients with severe, ischemically induced cardiac insufficiency.
    Löster H; Miehe K; Punzel M; Stiller O; Pankau H; Schauer J · Cardiovascular drugs and therapy · 2000
    Randomized trial41 participantsFitness forL-Carnitine
  27. L-Carnitine treatment reduces severity of physical and mental fatigue and increases cognitive functions in centenarians: a randomized and controlled clinical trial.
    Malaguarnera M; Cammalleri L; Gargante MP; Vacante M; Colonna V; Motta M · The American journal of clinical nutrition · 2008
    Randomized trial66 participantsFitness forL-Carnitine
  28. Effects of nine weeks L-Carnitine supplementation on exercise performance, anaerobic power, and exercise-induced oxidative stress in resistance-trained males.
    Koozehchian MS; Daneshfar A; Fallah E; Agha-Alinejad H; Samadi M; Kaviani M; Kaveh B M; Jung YP; Sablouei MH; Moradi N; Earnest CP; Chandler TJ; Kreider RB · Journal of exercise nutrition & biochemistry · 2020
    Randomized trial23 participantsFitness forL-Carnitine
  29. 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
  30. 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
  31. Effects of caffeine on mood and performance: a study of realistic consumption.
    Brice CF; Smith AP · Psychopharmacology · 2003
    Clinical trial24 participantsMental Focus forCaffeine
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. Elevated intakes of supplemental chromium improve glucose and insulin variables in individuals with type 2 diabetes.
    Anderson RA; Cheng N; Bryden NA; Polansky MM; Cheng N; Chi J; Feng J · Diabetes · 1997
    Randomized trial180 participantsMetabolism Boost forChromium
  39. Chromium Supplementation and the Effects on Metabolic Status in Women with Polycystic Ovary Syndrome: A Randomized, Double-Blind, Placebo-Controlled Trial.
    Jamilian M; Asemi Z · Annals of nutrition & metabolism · 2016
    Randomized trial64 participantsMetabolism Boost forChromium
  40. A Comprehensive insight into the effect of chromium supplementation on oxidative stress indices in diabetes mellitus: A systematic review.
    Kooshki F; Tutunchi H; Vajdi M; Karimi A; Niazkar HR; Shoorei H; Pourghassem Gargari B · Clinical and experimental pharmacology & physiology · 2024
    Systematic review33 studies pooledMetabolism Boost forChromium
  41. Comparison of nutritional supplements in improving glycolipid metabolism and endocrine function in polycystic ovary syndrome: a systematic review and network meta-analysis.
    Hu X; Wang W; Su X; Peng H; Tan Z; Li Y; Huang Y · PeerJ · 2023
    Meta-analysis2,362 participants41 studies pooledMetabolism Boost forChromium
  42. [Chromium supplementation in patients with type 2 diabetes and high risk of type 2 diabetes: a meta-analysis of randomized controlled trials].
    San Mauro-Martin I; Ruiz-León AM; Camina-Martín MA; Garicano-Vilar E; Collado-Yurrita L; Mateo-Silleras Bd; Redondo Del Río Mde P · Nutricion hospitalaria · 2017
    Meta-analysis13 studies pooledMetabolism Boost forChromium
  43. Effects of caffeine on alertness.
    Zwyghuizen-Doorenbos A; Roehrs TA; Lipschutz L; Timms V; Roth T · Psychopharmacology · 1990
    Randomized trial24 participantsProductivity Boost forCaffeine
  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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
  52. 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
  53. The Influences of Chromium Supplementation on Metabolic Status in Patients with Type 2 Diabetes Mellitus and Coronary Heart Disease.
    Farrokhian A; Mahmoodian M; Bahmani F; Amirani E; Shafabakhsh R; Asemi Z · Biological trace element research · 2021
    Randomized trial64 participantsWeight Loss forChromium
  54. Chromium picolinate supplementation attenuates body weight gain and increases insulin sensitivity in subjects with type 2 diabetes.
    Martin J; Wang ZQ; Zhang XH; Wachtel D; Volaufova J; Matthews DE; Cefalu WT · Diabetes care · 2006
    Randomized trial37 participantsWeight Loss forChromium
  55. Chromium picolinate reduces insulin resistance in polycystic ovary syndrome: Randomized controlled trial.
    Ashoush S; Abou-Gamrah A; Bayoumy H; Othman N · The journal of obstetrics and gynaecology research · 2017
    Randomized trial100 participantsWeight Loss forChromium
  56. Chromium supplementation and polycystic ovary syndrome: A systematic review and meta-analysis.
    Fazelian S; Rouhani MH; Bank SS; Amani R · Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) · 2018
    Meta-analysis351 participants7 studies pooledWeight Loss forChromium
  57. Chromium picolinate balances the metabolic and clinical markers in nonalcoholic fatty liver disease: a randomized, double-blind, placebo-controlled trial.
    Kooshki F; Moradi F; Karimi A; Niazkar HR; Khoshbaten M; Maleki V; Pourghassem Gargari B · European journal of gastroenterology & hepatology · 2021
    Randomized trial46 participantsWeight Loss forChromium
  58. A green tea extract high in catechins reduces body fat and cardiovascular risks in humans.
    Nagao T; Hase T; Tokimitsu I · Obesity (Silver Spring, Md.) · 2007
    Randomized trial240 participantsWeight Loss forGreen Tea
  59. Green tea beverages enriched with catechins with a galloyl moiety reduce body fat in moderately obese adults: a randomized double-blind placebo-controlled trial.
    Kobayashi M; Kawano T; Ukawa Y; Sagesaka YM; Fukuhara I · Food & function · 2016
    Randomized trial126 participantsWeight Loss forGreen Tea
  60. Green tea catechin consumption enhances exercise-induced abdominal fat loss in overweight and obese adults.
    Maki KC; Reeves MS; Farmer M; Yasunaga K; Matsuo N; Katsuragi Y; Komikado M; Tokimitsu I; Wilder D; Jones F; Blumberg JB; Cartwright Y · The Journal of nutrition · 2009
    Randomized trial132 participantsWeight Loss forGreen Tea
  61. Effect of Decaffeinated Green Tea Polyphenols on Body Fat and Precocious Puberty in Obese Girls: A Randomized Controlled Trial.
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