hydroxymethyl butyrate

hydroxymethyl butyrate (hī·drōkˑ·sē·me·thl byōō·tī·rāt),

n a compound produced in the body as a byproduct of leucine degradation; used to enhance muscle growth and to protect against muscle damage during weight training. Precaution advised in patients with severe liver or kidney disease. Also called
beta-hydroxy beta-methylbutyric acid.
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