Research
Energy balance
Postexercise protein-leucine supplementation does not significantly improve subsequent high-intensity endurance performance.
Practitioners should note that while protein-leucine supplementation aids recovery, it may not enhance performance in high-intensity endurance activities.
StrongRefutesmedium confidence
but the effect on sprint power was trivial (day 4 = 0.4% ± 1.0%, day 6 = -0.3% ± 1.0%).
Why this rating
Based on study design from abstract.
Source
A Protein–Leucine Supplement Increases Branched-Chain Amino Acid and Nitrogen Turnover But Not Performance
André R. Nelson et al. · Medicine & Science in Sports & Exercise · 2011
DOI 10.1249/mss.0b013e3182290371
rct · n=12Cited 45×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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