Systematic review finds no significant benefits of BCAA for endurance performance, suggesting limited effectiveness in athletes.
BCAA and leucine supplementation do not result in meaningful improvements in endurance performance or muscle recovery. Despite biochemical alterations, current evidence - limited by low methodological quality, surrogate outcomes, and risk of bias - does not support the use of BCAA as an effective strategy for endurance athletes.
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Guerra et al. (2026) studied this question.
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