Nitrosurge Shred Orange Pineapple

Nitrosurge Shred Orange Pineapple

Jacked Factory JF4.6 (23 ratings)
Format:Powder Quantity: 8 Ounce(s) · 30 servings
Goals
$29.99 $0.99 per serving

Product analysis

50 out of 100

Nitrosurge Shred Orange Pineapple may help alertness and exercise performance mainly through caffeine. Its brief effects on energy use do not establish lasting weight loss.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality23

Most ingredient forms are unspecified, leaving absorption quality difficult to compare. The separately identified theanine material does not resolve the missing form details in the ingredient listing.

Ingredient Transparency68

All active amounts are listed, helping with serving comparisons. Most forms are omitted, leaving the exact preparations less clear.

Value For Money42

Theobromine offers favourable value, while caffeine and theanine are less competitive within the serving cost. Comparisons for several other ingredients remain uncertain.

Customer Satisfaction68

The available customer ratings are positive. Only a small number of responses is available, so the picture of satisfaction is limited.

Product Focus72

The clearest immediate effects come from caffeine supporting alertness and exercise effort. Beta-alanine requires repeated use over weeks, and the formula does not establish lasting muscle gain or weight loss.

Format
Powder
Container
8 Ounce(s)
Per serving
$0.99
Customer rating
4.6 · 23 ratings
Report analysis

Goals

Energy
Impact
Highest effect
B+ Ingredient FitB PathwaysA+ EvidenceA+ Formulation Logic
Acetyl L-Carnitine · 1 Gram(s)Caffeine · 180 mg

Caffeine provides the clearest contribution by improving short-term alertness and reducing sleepiness. Beta-alanine relates to fatigue resistance during intense exercise after repeated supplementation over weeks; the 1,600 mg per serving does not reproduce those protocols. L-citrulline has limited exercise-specific support, with preparation differences restricting comparisons. Acetyl L-carnitine findings from selected clinical populations do not establish routine energy benefits.

How this product is rated for Energy

Ingredient fit81

Caffeine, Beta-Alanine, Acetyl L-Carnitine, Theanine, Citrulline, Theobromine are included at declared amounts, with partial coverage of the saved comparison ranges.
Goal fit
Caffeine, Beta-Alanine, Acetyl L-Carnitine, Theanine, Citrulline, Theobromine account for the relevant ingredients; the product is also linked to other goals.
Dose adequacy
The included amounts provide partial coverage of the saved comparison ranges; these ranges are not proven treatment doses.

Pathways79

The strongest recorded connection is central alertness, with partial coverage of the comparison range.
Depth
The strongest recorded connection is central alertness, with partial coverage of the comparison range.
Breadth
Alertness and cellular energy production reached the coverage threshold; other pathways remained below it.

Evidence98

Caffeine provides the strongest included evidence, subject to its preparation and population limits.
Evidence strength
Caffeine provides the strongest included evidence, subject to its preparation and population limits.
Studied preparation
Preparation matching is incomplete for Theanine, Theobromine; the other included preparations were matched.

Formulation logic100

The included ingredients have no recorded partner gap or configured conflict and clear the minimum amount threshold.
Partner coverage
The included ingredients can stand alone or have their required partner present.
Conflicts
No configured ingredient conflict was identified.
Effective doses
All included ingredients clear the saved minimum amount threshold; this is not a guarantee of a noticeable benefit.
Study evidence
Caffeine Supportive 68 studies
Theanine Not classified

No linked studies yet.

Mental Focus
Impact
Highest effect
B Ingredient FitB+ PathwaysB+ EvidenceA+ Formulation Logic
Acetyl L-Carnitine · 1 Gram(s)Theanine · 90 mgCaffeine · 180 mg

Caffeine supports alertness and sustained attention, while theanine offers a more limited connection to selective attention. The 90 mg theanine in the selected serving contributes less than the higher amounts used in the supplied attention studies, whose results are mixed. Acetyl L-carnitine and theobromine also receive saved contributions, but their supplied context does not establish routine acute focus benefits.

How this product is rated for Mental Focus

Ingredient fit75

Caffeine and theanine connect to attention within a formula that also serves other purposes.
Goal fit
Caffeine and theanine connect to attention within a formula that also serves other purposes.
Dose adequacy
Caffeine and acetyl L-carnitine receive full amount recognition; theanine contributes partially and theobromine only modestly.

Pathways80

Alertness is the strongest supported focus role; the saved findings also assign cerebral-energy coverage. The saved findings cover alertness and cerebral energy, with a smaller calm-attention contribution.
Depth
Alertness is the strongest supported focus role; the saved findings also assign cerebral-energy coverage.
Breadth
The saved findings cover alertness and cerebral energy, with a smaller calm-attention contribution.

Evidence81

Acetyl L-carnitine leads the saved evidence finding, although its supplied context does not establish acute focus enhancement. Most counted preparations match the saved preparation checks; theobromine does not.
Evidence strength
Acetyl L-carnitine leads the saved evidence finding, although its supplied context does not establish acute focus enhancement.
Studied preparation
Most counted preparations match the saved preparation checks; theobromine does not.

Formulation logic100

The included ingredients meet the saved partner requirements. No configured ingredient conflict was found in the supplied facts.
Partner coverage
The included ingredients meet the saved partner requirements.
Conflicts
No configured ingredient conflict was found in the supplied facts.
Effective doses
All ingredients counted by this rule meet its minimum amount criterion; this does not establish a proven effective dose.
Study evidence
Caffeine Supportive 128 studies
Theanine Supportive 19 studies
Metabolism Support
Impact
High effect
C+ Ingredient FitD PathwaysC EvidenceA+ Formulation Logic
Acetyl L-Carnitine · 1 Gram(s)Caffeine · 180 mg

Caffeine can briefly raise resting energy expenditure, with a modest acute effect rather than established lasting fat loss. The amount in one serving does not reproduce a repeated daily study regimen. Acetyl L-carnitine’s role in fatty-acid transport does not establish extra energy expenditure from supplementation.

How this product is rated for Metabolism Support

Ingredient fit68

The relevant ingredients sit within a broader formula, reducing its focus on energy expenditure. Retained amounts partly cover the comparison anchors, which are not proven effective doses for a lasting metabolic boost.
Goal fit
The relevant ingredients sit within a broader formula, reducing its focus on energy expenditure.
Dose adequacy
Retained amounts partly cover the comparison anchors, which are not proven effective doses for a lasting metabolic boost.

Pathways48

Adrenergic drive is the strongest recorded area; this does not establish a lasting increase in calorie expenditure.
Depth
Adrenergic drive is the strongest recorded area; this does not establish a lasting increase in calorie expenditure.
Breadth
Only adrenergic drive reached the coverage threshold.

Evidence62

Caffeine leads the eligible evidence findings; its specific study population and outcomes limit expectations of a general metabolism boost.
Evidence strength
Caffeine leads the eligible evidence findings; its specific study population and outcomes limit expectations of a general metabolism boost.
Studied preparation
Caffeine matches the supplied preparation comparison, while acetyl L-carnitine lacks a studied-preparation match.

Formulation logic100

No configured ingredient conflict was found. All retained ingredients meet the minimum comparison threshold; that threshold is not a proven effective dose for increasing calorie expenditure.
Partner coverage
The retained ingredients have no unmet partner requirement in the supplied findings.
Conflicts
No configured ingredient conflict was found.
Effective doses
All retained ingredients meet the minimum comparison threshold; that threshold is not a proven effective dose for increasing calorie expenditure.
Study evidence
Caffeine Disputed 40 studies
Productivity Boost
Impact
High effect
B- Ingredient FitB+ PathwaysB EvidenceA+ Formulation Logic
Acetyl L-Carnitine · 1 Gram(s)Acetyl L-Carnitine · 1 Gram(s)Theanine · 90 mgCaffeine · 180 mg

Caffeine supports short-term alertness and attention, while theanine has limited evidence for reducing sustained-attention errors. The 90 mg theanine in the selected 8.0 Gram(s) serving is below the amount used in the cited standalone study. Acetyl L-carnitine received a saved contribution, but its clinical and mechanistic evidence does not establish routine productivity benefits in healthy working adults.

How this product is rated for Productivity Boost

Ingredient fit74

The relevant ingredients sit alongside ingredients aimed at other uses, making the formula less focused on productivity. The declared amounts provide substantial but uneven support against the saved references.
Goal fit
The relevant ingredients sit alongside ingredients aimed at other uses, making the formula less focused on productivity.
Dose adequacy
The declared amounts provide substantial but uneven support against the saved references.

Pathways80

The strongest assigned route is adenosine-blocking alertness, with full coverage in the saved findings. Two configured routes reach the coverage threshold, while the remaining routes contribute less or receive no coverage.
Depth
The strongest assigned route is adenosine-blocking alertness, with full coverage in the saved findings.
Breadth
Two configured routes reach the coverage threshold, while the remaining routes contribute less or receive no coverage.

Evidence76

Caffeine supplies the strongest counted evidence, with benefits limited to the populations and outcomes described for that ingredient.
Evidence strength
Caffeine supplies the strongest counted evidence, with benefits limited to the populations and outcomes described for that ingredient.
Studied preparation
The saved findings recognize the counted preparations as studied; this does not establish that this product improves work performance.

Formulation logic100

No configured ingredient conflict was identified in the supplied findings. The counted ingredients have no unmet partner requirement.
Partner coverage
The counted ingredients have no unmet partner requirement in the saved findings; this does not establish synergy.
Conflicts
No configured ingredient conflict was identified in the supplied findings.
Effective doses
All counted ingredients meet the saved minimum amount criterion, which is not proof of a clinically effective productivity dose.
Study evidence
Caffeine Supportive 108 studies
Theanine Supportive 5 studies
Fitness
Impact
High effect
C Ingredient FitB PathwaysA EvidenceA+ Formulation Logic
Citrulline · 2 Gram(s)Beta-Alanine · 1.6 Gram(s)Caffeine · 180 mg

Caffeine can acutely support exercise performance, especially endurance, while strength and sprint responses vary. Beta-alanine contributes toward a repeated loading regimen for high-intensity efforts around one to four minutes; a single serving does not establish an acute effect. Pure L-citrulline has mixed evidence for selected exercise outcomes, with preparation and protocol differences limiting expectations. These ingredients do not establish an extra combination benefit.

How this product is rated for Fitness

Ingredient fit63

Beta-Alanine provides a relevant fitness contribution. The selected serving supplies partial contributions toward the comparison exposures, without establishing an effective personal regimen.
Goal fit
Beta-Alanine contributes to the fitness findings, while other active ingredients make the formula less focused on this goal.
Dose adequacy
The selected serving supplies partial contributions toward the comparison exposures, without establishing an effective personal regimen.

Pathways76

The strongest contribution concerns central drive and fatigue perception. Another exercise-related area also receives substantial coverage.
Depth
The strongest saved contribution concerns central drive and fatigue perception, reflecting the relevant ingredients and serving amounts.
Breadth
Two exercise-related areas receive substantial coverage, providing some breadth in the saved findings.

Evidence91

Beta-alanine evidence concerns repeated loading for high-intensity efforts, rather than an acute effect from one serving.
Evidence strength
Beta-alanine evidence concerns repeated loading for high-intensity efforts, rather than an acute effect from one serving.
Studied preparation
The relevant preparations meet the saved criteria; this does not establish superiority of forms or replicate a complete study regimen.

Formulation logic100

The relevant ingredients have the partners they require, and no configured conflict was identified. Included amounts meet the saved minimum comparison.
Partner coverage
The relevant ingredients can contribute independently or have their required partners present; an additional combination benefit is not established.
Conflicts
No configured ingredient conflict was identified in the supplied findings.
Effective doses
All included ingredients meet the saved minimum amount comparison; this is not proof of benefit from a single serving.
Study evidence
Caffeine Supportive 255 studies
Citrulline Supportive 45 studies
Weight Loss
Impact
Moderate effect
C+ Ingredient FitD PathwaysD+ EvidenceA+ Formulation Logic
Caffeine · 180 mg

Caffeine can briefly increase heat production and energy use, though this is different from sustained weight loss. The serving supplies 180 mg of declared caffeine; larger amounts do not automatically mean more weight lost. Habitual caffeine use can reduce the practical effect. Acetyl L-carnitine cannot inherit weight-loss findings from plain L-carnitine, and theanine adds no established weight-loss benefit.

How this product is rated for Weight Loss

Ingredient fit68

Caffeine supplies the main weight-related connection, while the wider formula varies in focus and independent support.
Goal fit
Caffeine supplies the main weight-related connection, while the wider formula varies in focus and independent support.
Dose adequacy
Amounts provide partial support against the saved benchmarks, with no proven sustained weight-loss dose implied.

Pathways45

Heat production and energy use are the strongest connections in the saved findings. Only heat production and energy use reach substantial coverage.
Depth
Heat production and energy use are the strongest connections in the saved findings.
Breadth
Only heat production and energy use reach substantial coverage.

Evidence52

Caffeine leads the saved evidence comparison, supporting brief heat production rather than proven sustained weight loss.
Evidence strength
Caffeine leads the saved evidence comparison, supporting brief heat production rather than proven sustained weight loss.
Studied preparation
Only some included preparations are matched in the saved findings, limiting how confidently preparation-specific findings can be applied.

Formulation logic100

No required partner is missing. No assessed ingredient conflict was found.
Partner coverage
Included ingredients have no missing required partner.
Conflicts
No assessed ingredient conflict was found.
Effective doses
All included ingredients meet the saved minimum amount for inclusion, without establishing a universal effective weight-loss dose.
Study evidence
Caffeine Disputed 14 studies
Theanine Not classified

No linked studies yet.

Muscle Gain
Impact
High effect
C- Ingredient FitD+ PathwaysB EvidenceA+ Formulation Logic
Caffeine · 180 mgCitrulline · 2 Gram(s)Beta-Alanine · 1.6 Gram(s)

Caffeine may contribute to acute training performance, but that does not establish sustained muscle growth. The saved result recognizes a training-work-capacity contribution from the formula, while the supplied context limits independent hypertrophy claims for its other performance ingredients. Blood-flow, fatigue or acute-force mechanisms cannot be treated as proof of added muscle mass from a selected serving.

How this product is rated for Muscle Gain

Ingredient fit58

The formula emphasizes training-related ingredients, while additional actives and links to other goals reduce its focus on muscle gain.
Goal fit
The formula emphasizes training-related ingredients, while additional actives and links to other goals reduce its focus on muscle gain.
Dose adequacy
Recognized ingredients make differing partial contributions against the saved amount references; these are not validated clinical dose-response thresholds.

Pathways52

Only training work capacity and recovery reaches the saved coverage threshold; other muscle-gain areas remain smaller or absent.
Depth
Training work capacity and recovery is the strongest recognized area; this does not establish chronic muscle growth.
Breadth
Only training work capacity and recovery reaches the saved coverage threshold; other muscle-gain areas remain smaller or absent.

Evidence79

Caffeine drives the strongest saved evidence finding; evidence for acute performance does not establish sustained muscle gain.
Evidence strength
Caffeine drives the strongest saved evidence finding; evidence for acute performance does not establish sustained muscle gain.
Studied preparation
Beta-alanine lack the saved preparation match; other recognized preparations match, without proving chronic muscle gain.

Formulation logic100

No configured ingredient conflict was triggered; this covers only the evaluated combinations. Recognized ingredients meet the saved minimum amount threshold and have no missing required partners.
Partner coverage
Recognized ingredients work independently or have their required partners; this does not establish added muscle growth from combining them.
Conflicts
No configured ingredient conflict was triggered; this covers only the evaluated combinations.
Effective doses
All recognized ingredients meet the saved minimum amount threshold; that does not establish a proven hypertrophy dose.
Study evidence
Caffeine Supportive 31 studies

Ingredients

IngredientAmount per servingScore
L-Citrulline
2 Gram(s)
Beta-Alanine
1.6 Gram(s)
Acetyl-L-Carnitine (Acetyl-L-Carnitine HCl)
1 Gram(s)
Caffeine Anhydrous
180 mg 64
L-Theanine
90 mg 70
Theobromine
50 mg 80
Bioperine Black Pepper fruit extract
2.5 mg
Adults 18–50 Women
Report overview
Theobromine · 50 mg OverallScore80
B Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyB+ Value
Theobromine is listed at a relatively modest 50 mg per serving. A whole-product serving costs about $1.00.
How this ingredient is rated

Active Ingredient Quality & Bioavailability79

Theobromine has a separate listed amount, though its purity is not established by that amount alone. The evaluation flags an artificial color, sweetener, or hydrogenated oil; the saved facts do not identify which.
Theobromine Purity and Standardization
Theobromine has its own listed amount of 50 mg per serving; that alone does not establish purity.
Excipient Profile and Clean Label
The evaluation flags an artificial color, sweetener, or hydrogenated oil; the saved facts do not identify which.

Dose, Safety & Label Transparency82

The label specifies 50 mg of theobromine per serving.
Theobromine Dosage Efficacy and Safety
50 mg per serving is a modest amount that may contribute alongside other ingredients.
Labeling Transparency and Disclosure
The exact theobromine amount is listed as 50 mg per serving.

Value80

A whole-product serving costs about $1.00.
Price Per Serving Efficiency
A whole-product serving costs about $1.00.
Caffeine · 180 mg OverallScore64
D- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyD- Value
Each serving supplies 180 mg of caffeine, a moderate amount. The whole product costs about $1.00 per serving.
How this ingredient is rated

Active Ingredient Quality & Bioavailability40

The saved information does not identify a specific caffeine form.
Advanced Bioavailability and Release Profiles
Caffeine is recorded, but its specific form is unknown in the saved facts.

Dose, Safety & Label Transparency100

The recorded serving contains a moderate amount of caffeine.
Caffeine Dose Transparency
The saved facts record 180 mg of caffeine per serving.
Dosage Efficacy and Safety Margin
The recorded 180 mg per serving is considered moderate in the evaluation.
Secondary Stimulant Disclosure and Risk
The evaluated ingredient list identifies no additional stimulants.

Value40

The whole-product price per serving is relatively high.
Price Per Serving vs. Collection Median
The whole product costs about $1.00 per serving.
Theanine · 90 mg OverallScore70
B+ Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyF Value
Each serving provides 90 mg of L-theanine. At the whole-product price, that works out to about $1.11 per 100 mg of theanine.
How this ingredient is rated

Active Ingredient Quality & Bioavailability80

The form is L-theanine; the available facts do not establish a branded form or a purity claim.
Isomer Specificity (L-Theanine)
The ingredient is identified as L-theanine.
Branded Forms & Purity Standards
The available facts do not establish a branded form or a purity claim.

Dose, Safety & Label Transparency86

The disclosed 90 mg per serving is a relatively modest amount.
Theanine Dosage Efficacy
Each serving provides a relatively modest 90 mg of L-theanine, which may offer milder support.
Label Transparency & Blends
The 90 mg of L-theanine per serving is individually disclosed.

Value20

At the whole-product price, the cost is about $1.11 per 100 mg of theanine.
Price per 100mg L-Theanine
At the whole-product price, the cost is about $1.11 per 100 mg of theanine.
Report alternatives

Sources

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

  1. 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 participantsEnergy forAcetyl L-Carnitine
  2. The supplementation of acetyl-L-carnitine decreases fatigue and increases quality of life in patients with hepatitis C treated with pegylated interferon-α 2b plus ribavirin.
    Malaguarnera M; Vacante M; Bertino G; Neri S; Malaguarnera M; Gargante MP; Motta M; Lupo L; Chisari G; Bruno CM; Pennisi G; Bella R · Journal of interferon & cytokine research : the official journal of the International Society for Interferon and Cytokine Research · 2012
    Randomized trial60 participantsEnergy forAcetyl L-Carnitine
  3. Acetyl-L-carnitine reduces depression and improves quality of life in patients with minimal hepatic encephalopathy.
    Malaguarnera M; Bella R; Vacante M; Giordano M; Malaguarnera G; Gargante MP; Motta M; Mistretta A; Rampello L; Pennisi G · Scandinavian journal of gastroenterology · 2011
    Randomized trial67 participantsEnergy forAcetyl L-Carnitine
  4. A prospective study to evaluate the efficacy and safety of oral acetyl-L-carnitine for the treatment of chemotherapy-induced peripheral neuropathy.
    Sun Y; Shu Y; Liu B; Liu P; Wu C; Zheng R; Zhang X; Zhuang Z; Deng Y; Zheng L; Xu Q; Jiang B; Ouyang X; Gao J; Xu N; Li X; Jiang S; Liang C; Yao Y · Experimental and therapeutic medicine · 2020
    Randomized trial239 participantsEnergy forAcetyl L-Carnitine
  5. Metabolomic biomarkers for (R, S)-ketamine and (S)-ketamine in treatment-resistant depression and healthy controls: A systematic review.
    Kumar R; Nuñez NA; Joshi N; Joseph B; Verde A; Seshadri A; Cuellar Barboza AB; Prokop LJ; Medeiros GC; Singh B · Bipolar disorders · 2024
    Systematic reviewEnergy forAcetyl L-Carnitine
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. Sleep symptoms associated with intake of specific dietary nutrients.
    Grandner MA; Jackson N; Gerstner JR; Knutson KL · Journal of sleep research · 2014
    Cross-sectional study4,552 participantsEnergy forTheobromine
  17. 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
  18. 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
  19. 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
  20. 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