The Claim
Beta-hydroxy-beta-methylbutyrate (HMB) supplementation at typical doses (3 g/day) for 4–12 weeks during resistance training has no meaningful effect on increases in bench press or leg press strength, body mass, fat-free mass, or fat mass in trained and competitive athletes, as demonstrated by trivial effect sizes (all ES < 0.20) and non-significant p-values across six randomized controlled trials involving 193 participants.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Taking HMB supplements at 3 grams per day for 4 to 12 weeks while doing resistance training does not lead to meaningful changes in strength, body weight, muscle mass, or fat mass in trained athletes.
See the scientific wording
Beta-hydroxy-beta-methylbutyrate (HMB) supplementation at typical doses (3 g/day) for 4–12 weeks during resistance training has no meaningful effect on increases in bench press or leg press strength, body mass, fat-free mass, or fat mass in trained and competitive athletes, as demonstrated by trivial effect sizes (all ES < 0.20) and non-significant p-values across six randomized controlled trials involving 193 participants.
What the research says
1 studyThis study looked at whether taking HMB supplements helps athletes get stronger or change their body shape during weight training. It found no real benefit — athletes didn’t get stronger or change their muscle or fat levels any more than those who didn’t take the supplement.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.