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Head-to-head evidence comparison — which supplement is right for you?
BCAAs wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
7 of 13 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
2 of 2 studies with measurable effects showed benefit.
Top outcomes
5-10g per serving
Before fasted training, During long endurance sessions, Between meals
Powder (2:1:1 ratio)
1-1.5g per kg body weight
1-2.5 hours before endurance exercise, Consume with large volume of fluid (1-2L)
Glycerol powder (65% concentration typical)
24-72 hours post-exercise
During exercise
Ongoing
Immediate
During exercise (1-3 hours post-ingestion)
During exercise in heat
During exercise
1-2 hours post-ingestion
Systematic review with meta-analysis: Branched-chain amino acid supplementation in liver disease
European journal of clinical investigation (2023) · Meta analysis · n=2308
According to meta-analyses, long-term (at least 6 months) BCAA supplementation in cirrhotic patients significantly improved event-free survival (p = .008; RR .61 95% CI .42-.88) and tended to improve overall survival (p = .05; RR .58 95% CI .34-1.00).
Branched-chain amino acids for people with hepatic encephalopathy
The Cochrane database of systematic reviews (2017) · Meta analysis · n=827
In a random-effects meta-analysis of mortality, we found no difference between BCAA and controls (risk ratio (RR) 0.88, 95% confidence interval (CI) 0.69 to 1.11; 760 participants; 15 trials; moderate quality of evidence).
Causal Relationship Between Branched-Chain Amino Acids and Hypertension: A Mendelian Randomization Study
Journal of the American Heart Association (2024) · Meta analysis · n=845
As suggested by the meta-analysis results, elevated BCAA levels were associated with a higher risk of hypertension (isoleucine: summary odds ratio, 1.26 [95% CI, 1.08-1.47]; leucine: summary odds ratio, 1.28 [95% CI, 1.07-1.52]; valine: summary odds ratio, 1.32 [95% CI, 1.12-1.57]).
Nutritional Ergogenic Aids in Combat Sports: A Systematic Review and Meta-Analysis
Nutrients (2022) · Meta analysis
In this regard, abilities including the number of attacks, reaction time, handgrip strength, power and TTE, among others, were improved.
The effect of pre-exercise oral hyperhydration on endurance exercise performance, heart rate, and thermoregulation: a meta-analytical review
Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme (2024) · Meta analysis
Meta-analysis determined overall effect size (Hedges' g), and meta-regression the influence of independent moderators (ambient temperature, hyperhydration agent, exercise mode, extent of hyperhydration).
Meta-analysis: Effects of glycerol administration on plasma volume, haemoglobin, and haematocrit
Drug testing and analysis (2013) · Meta analysis
The meta-analysis revealed that the increase in plasma volume was 3.3% larger (95%-CI: 1.1-5.5%) after glycerol administration when compared to fluid only.
Evidence limited to resistance training populations. Systematic review found negligible benefits on body composition in athletes. Benefits may be more apparent in caloric deficit or fasted states but data is limited.
Based on meta-analysis showing hyperhydration effects on endurance. Conservative effectiveness given limited direct glycerol performance studies in the provided evidence. GI side effects increase notably at higher doses.
AI-estimated from published studies. Interpret as directional guidance.
BCAAs has a higher evidence score (9/10 vs 7.5/10) and wins in 2 of 3 categories.
For improve endurance, Glycerol has a higher relevance score (80 vs 60).
No known interactions between BCAAs and Glycerol have been documented in our database. However, always consult a healthcare provider before combining supplements.