Creatine vs HMB
The best-evidenced supplement on this entire site against a purpose-built anti-catabolic — one for building strength and lean mass, the other specifically for not losing it.
Short answer
Neither creatine nor HMB needs a prescription, and both have human data, so the goal decides it. Creatine is marketed for strength, muscle and cognition; HMB is the choice for readers interested in muscle preservation, sarcopenia and lean mass on GLP-1s.
Creatine
Creatine monohydrate
The best-evidenced supplement here: strong human data for strength and lean mass with training, a real cognitive signal under stress, and a clean safety record — 'anti-aging' claims still outrun the data.
Full Creatine evidence reviewHMB
β-hydroxy β-methylbutyrate
Anti-catabolic leucine metabolite with real RCT support for preserving lean mass in bed rest, disuse and sarcopenia — but trivial effects in trained athletes and no trials at all in GLP-1 users.
Full HMB evidence reviewCreatine vs HMB: head to head
- FDA status / approved use
Creatine
Sold as a supplement; among the most studied supplements availableHMB
Sold as a dietary supplement; not FDA-approved to treat or prevent any condition- Marketed for
Creatine
Strength, muscle, cognitionHMB
Muscle preservation, sarcopenia, lean mass on GLP-1s- Outcome areas
Creatine
Muscle / strength / lean mass; Cognitive function / memory; Exercise performance / enduranceHMB
Muscle / strength / lean mass- Evidence grade
Creatine
Clinical dataHMB
Clinical data- How it works
Creatine
Loads the phosphocreatine pool that rapidly regenerates ATP during short, intense effortHMB
Slows muscle protein breakdown; modestly boosts protein synthesis via mTORC1- Route and dosing
Creatine
Oral creatine monohydrate, 3 to 5 g dailyHMB
Oral, 3 g daily, usually split into two 1.5 g doses- Headline human result
Creatine
Pooled effect sizes of 0.17 for body composition and 0.24 for short exercise tasks across 100 placebo-controlled studiesHMB
In a 10-day bed-rest trial of 24 older adults, placebo lost about 2 kg lean mass; 3 g/day HMB essentially none- Strongest evidence
Creatine
ISSN Position Stand, JISSN 2017Creatine evidence reviewPubMed 28615996HMB
Sarcopenia meta-analysis, Maturitas 2025HMB evidence reviewPubMed 39999663- Key safety signal
Creatine
Main side effect is a few pounds of water weight; no compelling evidence of kidney harmHMB
Safe for at least a year in trials; little long-term data in frail patients on many drugs- How it is obtained
Creatine
Over the counter as a dietary supplementHMB
Over the counter as a dietary supplement
| Creatine | HMB | |
|---|---|---|
| FDA status / approved use | Sold as a supplement; among the most studied supplements available | Sold as a dietary supplement; not FDA-approved to treat or prevent any condition |
| Marketed for | Strength, muscle, cognition | Muscle preservation, sarcopenia, lean mass on GLP-1s |
| Outcome areas | Muscle / strength / lean mass; Cognitive function / memory; Exercise performance / endurance | Muscle / strength / lean mass |
| Evidence grade | Clinical data | Clinical data |
| How it works | Loads the phosphocreatine pool that rapidly regenerates ATP during short, intense effort | Slows muscle protein breakdown; modestly boosts protein synthesis via mTORC1 |
| Route and dosing | Oral creatine monohydrate, 3 to 5 g daily | Oral, 3 g daily, usually split into two 1.5 g doses |
| Headline human result | Pooled effect sizes of 0.17 for body composition and 0.24 for short exercise tasks across 100 placebo-controlled studies | In a 10-day bed-rest trial of 24 older adults, placebo lost about 2 kg lean mass; 3 g/day HMB essentially none |
| Strongest evidence | ISSN Position Stand, JISSN 2017Creatine evidence reviewPubMed 28615996 | Sarcopenia meta-analysis, Maturitas 2025HMB evidence reviewPubMed 39999663 |
| Key safety signal | Main side effect is a few pounds of water weight; no compelling evidence of kidney harm | Safe for at least a year in trials; little long-term data in frail patients on many drugs |
| How it is obtained | Over the counter as a dietary supplement | Over the counter as a dietary supplement |
marks a row where the two differ. “Not established” marks a cell the available evidence does not answer. Evidence grades come from our evidence matrix, which grades each molecule on the human data for the use it is marketed for.
- Clinical data:
- Tested in humans — but investigational, discontinued, or proven only on a surrogate marker (not the marketed outcome).
Our verdict
Creatine has the strongest human evidence of any compound covered here: real strength and lean-mass gains with training, a genuine cognitive signal under stress, and a clean decades-long safety record. HMB works differently and for a different problem — it's anti-catabolic, with real trial support for preserving lean mass during bed rest, disuse, and sarcopenia, but trivial effects in already-training athletes and zero trials specifically in GLP-1 users despite heavy marketing toward that group.
Creatine fits if
You're actively training and want to build strength and lean mass, not just preserve what you have.
HMB fits if
You're in a catabolic situation (illness, injury, bed rest, or possibly GLP-1-driven muscle loss, though untested there specifically) and preservation is the goal, not growth.
Creatine vs HMB: common questions
- Is either creatine or HMB FDA-approved?
- No. Creatine is sold as a supplement; among the most studied supplements available. HMB is sold as a dietary supplement; not FDA-approved to treat or prevent any condition.
- Which has stronger human evidence, creatine or HMB?
- Neither clearly. Both have human clinical data. The key source for creatine is ISSN Position Stand, JISSN 2017; for HMB, it is Sarcopenia meta-analysis, Maturitas 2025.
- What are the main safety concerns with creatine and HMB?
- With creatine, main side effect is a few pounds of water weight; no compelling evidence of kidney harm. HMB is safe for at least a year in trials; little long-term data in frail patients on many drugs.
Key studies behind each
Creatine
- Branch JD. (2003). Effect of creatine supplementation on body composition and performance: a meta-analysis. Int J Sport Nutr Exerc Metab. PubMed 12945830
- Kreider RB, Kalman DS, Antonio J, et al. (2017). International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. PubMed 28615996
- Avgerinos KI, Spyrou N, Bougioukas KI, Kapogiannis D. (2018). Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials. Exp Gerontol. PubMed 29704637
- Rae C, Digney AL, McEwan SR, Bates TC. (2003). Oral creatine monohydrate supplementation improves brain performance: a double-blind, placebo-controlled, cross-over trial. Proc Biol Sci. PubMed 14561278
HMB
- Nissen S, Sharp R, Ray M, Rathmacher JA, Rice D, Fuller JC Jr, Connelly AS, Abumrad N. (1996). Effect of leucine metabolite beta-hydroxy-beta-methylbutyrate on muscle metabolism during resistance-exercise training. J Appl Physiol (1985). PubMed 8941534
- Wilkinson DJ, Hossain T, Hill DS, Phillips BE, Crossland H, Williams J, et al. (2013). Effects of leucine and its metabolite β-hydroxy-β-methylbutyrate on human skeletal muscle protein metabolism. J Physiol. PubMed 23551944
- Wilkinson DJ, Hossain T, Limb MC, Phillips BE, Lund J, Williams JP, et al. (2018). Impact of the calcium form of β-hydroxy-β-methylbutyrate upon human skeletal muscle protein metabolism. Clin Nutr. PubMed 29097038
- Fuller JC Jr, Sharp RL, Angus HF, Baier SM, Rathmacher JA. (2011). Free acid gel form of β-hydroxy-β-methylbutyrate (HMB) improves HMB clearance from plasma in human subjects compared with the calcium HMB salt. Br J Nutr. PubMed 21134325
The full evidence reviews
- Creatine monohydrate: the best-evidenced supplement, graded honestly
Strong, replicated human data for strength and lean mass; a real but smaller cognitive signal under stress; a clean safety record — and a longevity story that's plausible but not yet proven.
Updated August 2026
- HMB supplement: what β-hydroxy β-methylbutyrate actually does for muscle
The evidence splits hard by population — meaningful in bed rest, disuse, and sarcopenia, weak to null in trained athletes, and completely untested in anyone taking a GLP-1.
Updated August 2026