"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." ANYONE WHO SPENDS significant time in the gym is probably willing to admit that muscle building isn't ...

ANYONE WHO SPENDS significant time in the gym is probably willing to admit that muscle building isn't easy. It takes a ton of dedication, which is difficult to muster up day in and day out. So, it's ...

Medically reviewed by Allison Herries, RDNMedically reviewed by Allison Herries, RDN Hydroxymethylbutyrate (HMB), a byproduct of the body's leucine metabolism, is essential for protein metabolism, ...