What it is & primary uses
Beta-hydroxy-beta-methylbutyrate is a leucine metabolite studied for muscle preservation and training adaptation.
Main benefits
- May help preserve lean tissue in older, untrained or catabolic populations.
- Benefits are smaller and less reliable in well-trained adults already consuming adequate protein.
Studied protocols
Research doses are grouped by outcome. They describe study designs—not a personal prescription.
3 g/day HMB
- Study duration
- Commonly 4–12 weeks; protocol and outcome vary
- Interpretation
- Benefits are smaller and less reliable in well-trained adults already consuming adequate protein.
04Food sources & equivalents＋
Can food provide a studied amount?
Small amounts occur from leucine metabolism and in foods such as avocado can provide related dietary exposure, but food and extract milligrams are not automatically interchangeable.
Dietary exposure; verify composition before comparing with a studied supplement dose
- How this was estimated
- Dose Radar compares the declared active ingredient with official composition data or the studied standardized extract—not with marketing names.
- Important limitation
- Natural content, preparation, bioavailability and formulation vary. This comparison does not prove equal physiological effect.
Food equivalents compare ingredient mass using published composition values. They do not prove equal absorption, formulation, physiological effect, safety or personal need.
Source: NIH ODS exercise-performance fact sheet ↗05How to take it for absorption & tolerance＋
With or without food
Human research has not established a universally superior fed or fasted protocol for this ingredient.
- Practical approach
- Divided across the day. Keep the formulation and daily total consistent with the evidence context shown above.
- Watch for
- Medication and supplement interactions are not fully mapped
Meal guidance reflects human pharmacokinetic, clinical, official-label or evidence-review sources where available. A food pairing can change absorption or tolerability, but does not make a supplement necessary, effective or safe for every person.
Source: NIH ODS exercise-performance fact sheet ↗06Supplement interaction check＋
An unlisted pair means no established pair-specific interaction was identified in this review—not proof that every dose, product or person is safe.
This is not proof that every dose, product or user context is safe. Medication and condition checks still apply.
07Research notes＋
Moderate evidence for the stated context. Benefits are smaller and less reliable in well-trained adults already consuming adequate protein.
The displayed amount comes from human research or an official evidence summary. It is not a personalized prescription, and formulation can change whether the comparison is valid.
08Scientific references＋
Peer-reviewed human research and formal evidence reviews. Open each source to inspect the complete paper record.
NIH ODS exercise-performance fact sheet
Dose context: 3 g/day HMB
May help preserve lean tissue in older, untrained or catabolic populations. Benefits are smaller and less reliable in well-trained adults already consuming adequate protein.
HMB: live PubMed review search
Dose context: Ingredient-specific human literature; dose and formulation vary
This live index supports source verification. A new paper does not change the Dose Radar grade until its design, population and formulation are reviewed.
09Expert & media references＋
Podcast and practitioner statements are clearly separated from research. They may explain practice or emerging ideas, but do not prove efficacy.
Dose Radar will leave this lane empty rather than invent or infer a professional opinion.