HMB, or beta-hydroxy beta-methylbutyrate, is a metabolite of the essential amino acid leucine. Leucine is well-known for its role in protein synthesis, and HMB is believed to be one of the compounds responsible for many of leucine's anti-catabolic (reducing muscle breakdown) effects. It is naturally produced in small quantities by the human body and can also be found in certain foods like grapefruit, alfalfa, and catfish. Due to its potential to support muscle maintenance and growth, HMB is commonly marketed as a dietary supplement for athletes, bodybuilders, and individuals seeking to preserve muscle mass, particularly during periods of intense training or caloric restriction. (NIH ODS)
Deep dive
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Known interactions
Category rule: glp1 × supplement
Note
GLP-1 medications slow stomach emptying, changing how/when oral supplements absorb; rapid weight loss raises the importance of protein and micronutrients.
Time oral supplements when nausea is lowest; prioritize protein and micronutrients; discuss with your provider.
Category rule: supplement × medication
Note
Some supplements change how the body processes medications (absorption, liver enzymes, or additive effects).
Specific pairs are checked against a licensed drug database and shown with their own severity. Always confirm with your provider or pharmacist.
Frequently asked
Sources referenced
["NIH Office of Dietary Supplements (ODS)", "MedlinePlus", "PubChem", "Cochrane Library", "DrugBank", "FDA label information for dietary supplements (general safety statements)", "Journal of the International Society of Sports Nutrition (referencing reviews and meta-analyses)"]
Stackwise compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician.
Related compounds
Others in the supplement category or studied for the same goals.