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Head-to-head evidence comparison — which supplement is right for you?
BCAAs wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
8 of 16 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
5-10g per serving
Before fasted training, During long endurance sessions, Between meals
Powder (2:1:1 ratio)
2.5-6g betaine/TMG daily (performance studies commonly use ~2.5g; methylation/homocysteine use up to 6g)
with-meals
Betaine anhydrous (TMG)
24-72 hours post-exercise
During exercise
Ongoing
Immediate
2-6 weeks
4-8 weeks
4-8 weeks
Throughout use
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]).
Effects of Betaine Supplementation on Muscle Strength and Power: A Systematic Review.
Journal of strength and conditioning research (2017) · Systematic review
Some improvement in strength/power endpoints
Effects of chronic betaine supplementation on exercise performance: Systematic review and meta-analysis.
Journal of sports sciences (2024) · Meta analysis
Modest benefit on some performance measures
Betaine supplementation fails to improve body composition: a systematic review and meta-analysis.
The British journal of nutrition (2022) · Meta analysis
No significant change in body fat or lean mass
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.
AI-estimated from published studies. Interpret as directional guidance.
BCAAs has a higher evidence score (9/10 vs 5.8/10) and wins in 3 of 3 categories.
For build strength & muscle, BCAAs has a higher relevance score (65 vs 55).
No known interactions between BCAAs and TMG have been documented in our database. However, always consult a healthcare provider before combining supplements.