Description
NutraBio HMB
1,000mg of HMB per serving as calcium beta-hydroxy beta-methylbutyrate, in vegetable capsules. 180 capsules, fully disclosed label.
⚠ Read the dosing before you buy: 1,000mg is one third of a daily dose
The researched dose is 3 grams per day. Each serving here is 1,000mg.
That means three servings daily, not one. NutraBio say so in their own directions, but it is easy to miss, and someone taking a single serving is at a third of the amount the studies used.
NutraBio also give a bodyweight-adjusted figure, which is more precise:
| 38mg per kg | or | 17mg per pound of bodyweight, daily |
So a 90kg lifter is looking at roughly 3.4g, and a 60kg athlete closer to 2.3g. Split it across two or three servings through the day rather than taking it all at once — that is how the research administered it.
Work out your own dose before you buy, because it determines how long a bottle lasts.
What HMB actually is — and the one thing that defines it
HMB is a metabolite of leucine, the amino acid that triggers muscle protein synthesis. Roughly 5% of the leucine you consume is converted to HMB, which means you already make small amounts from any protein you eat.
Here is the defining point: HMB is primarily anti-catabolic, not anabolic.
Its main researched action is reducing muscle protein breakdown rather than increasing muscle protein synthesis. It protects what you have rather than adding more.
That single distinction tells you exactly who should buy it, and it is the opposite of how HMB is usually marketed.
Who HMB genuinely works for
The research is clearest in situations where muscle breakdown is elevated:
- Training in a caloric deficit. The strongest practical case — when you are cutting, breakdown rises and preserving lean mass becomes the priority
- Returning after a layoff. Untrained or detrained individuals show the most consistent results in the literature
- Very high training volumes — two-a-days, camps, or sudden increases in load
- Older adults. HMB has a genuine body of research in age-related muscle loss, where breakdown outpaces synthesis
- Periods of immobilisation or injury, where preserving tissue is the whole goal
And who it does not
We would rather be straight with you.
In trained lifters eating at maintenance or a surplus, HMB's results are modest and inconsistent. If you are already training well, eating enough protein and gaining, this is not where your money is best spent — creatine is, by a wide margin.
There is also a fair question about whether it adds anything to adequate protein intake. If you are eating enough leucine, you are producing HMB from it. Supplementation raises the amount, but the marginal benefit in a well-fed trained lifter is small.
HMB is validated by the International Society of Sports Nutrition and backed by a substantial body of human research — but the research is clearest in the specific situations above, not as a general muscle builder.
Specs
| HMB | 1,000mg per serving, as calcium HMB monohydrate |
| Researched daily dose | 3g, or 38mg/kg bodyweight |
| Capsules | 180, vegetable |
| Other ingredients | None beyond the capsule |
| Manufacture | NutraBio's GMP-certified, FDA-inspected New Jersey facility |
| Testing | Third-party tested, results published at checkmysupps.com |
Vegetable capsules make this suitable for vegetarians and vegans — worth noting, since many capsule supplements use gelatin.
How to take it
- 3g daily total, or 38mg per kg of bodyweight.
- Split across two or three servings spread through the day — that is how the studies dosed it.
- Take one serving about an hour before training to help reduce exercise-induced muscle damage.
- If you cannot take it beforehand, take it immediately after instead.
- Every day, including rest days. HMB works by maintaining a consistent blood level.
- Give it two to four weeks. There is no acute effect to feel.
Who this is for
- Anyone cutting who wants to preserve lean mass — the clearest use case
- People returning to training after time off
- Older adults concerned about age-related muscle loss
- Athletes in very high volume blocks or camps
- Anyone immobilised by injury, where preserving tissue is the goal
- Vegetarians and vegans — vegetable capsules
Who this is not for
Trained lifters eating at maintenance or a surplus. Results are modest and inconsistent in that group, and creatine is a far better use of the same money.
Anyone expecting to feel something. HMB has no acute effect at all.
If you take one serving a day, you are at a third of the researched dose — factor the real cost in before buying.
If your protein intake is already high, the marginal benefit is small.
Not for anyone under 18, pregnant or nursing.
Stack it with: creatine — the two are frequently studied together and work by opposite mechanisms, one building and one preserving. Also see NutraBio Creatine + HMB, which combines both.
Frequently asked questions
How much HMB should I take?
3g daily, or 38mg per kg of bodyweight. Each serving here is 1,000mg, so that is three servings — split across the day.
What is HMB?
A metabolite of leucine. About 5% of dietary leucine converts to HMB, so you already produce small amounts from the protein you eat.
Does it build muscle?
Primarily it reduces muscle breakdown rather than increasing growth. It protects what you have, which is why it works best in a deficit or after a layoff.
Who benefits most?
People cutting, returning after time off, training at very high volumes, older adults, and anyone immobilised by injury.
Will it help if I'm already training well and eating enough?
Modestly at best. Results in trained, well-fed lifters are inconsistent. Creatine is the better purchase in that situation.
When should I take it?
Split into two or three servings daily, with one about an hour before training.
Should I take it on rest days?
Yes. It works by maintaining consistent blood levels.
How long until it works?
Two to four weeks. There is no acute effect to notice.
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