Does HMB-free acid supplementation increase plasma HMB and muscle mass in older men?

We analyzed the available evidence and found that HMB-free acid supplementation increases plasma HMB levels in older men, meaning the body absorbs it as expected [1]. However, the changes in muscle mass were small — only a minor gain in thigh muscle was observed, with no other meaningful health improvements noted [1]. The evidence we’ve reviewed so far leans toward absorption occurring without strong or consistent benefits for muscle growth or overall health in this group. We did not find any studies that contradicted these findings, but the lack of broader effects suggests the increase in blood HMB does not reliably translate into noticeable physical changes. What we’ve found so far is limited to one assertion, and while absorption is confirmed, the practical impact remains unclear. For older men considering HMB-free acid, the evidence suggests it may raise blood levels of HMB, but it’s unlikely to produce significant gains in muscle or health outcomes based on what’s been observed.