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Both leucine and alanine groups showed similar increases in leg-press one-repetition maximum (1RM) after the intervention.
Both leucine and alanine supplementation resulted in similar strength improvements, indicating that leucine may not be necessary for strength gains.
StrongSupportsmedium confidence
Similar increases were observed between groups in leg-press 1RM (LEU, 19.0% ± 9.4% and PLA, 21.0% ± 10.4%, P = 0.31).
Why this rating
Based on study design from abstract.
Source
Leucine Supplementation Has No Further Effect on Training-induced Muscle Adaptations
Isabel Thomazi de Andrade et al. · Medicine & Science in Sports & Exercise · 2020
DOI 10.1249/mss.0000000000002307
rct · n=25Cited 22×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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