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HMB – Muscle Protection and Anti-Catabolism
What is HMB?
HMB (beta-hydroxy-beta-methylbutyrate) is a metabolite of the essential amino acid leucine. When the body breaks down leucine, various intermediate products are formed – HMB is one of them, accounting for approximately 5% of leucine metabolism. Since the body endogenously produces only about 0.2–0.4 g of HMB per day on average, supplementing with 3 g daily represents a significant increase in the available amount.
Mechanisms of Action
Anti-catabolism
HMB inhibits the proteasomal protein degradation pathway (ubiquitin-proteasome system, UPS) – the main pathway by which muscle proteins are broken down. This degradation pathway is activated during negative energy balance, intense training, or inactivity. HMB can dampen it and thus protect muscles.
Muscle Protein Synthesis
HMB activates mTOR (similar to leucine, but weaker) and thus promotes muscle protein synthesis. It also stimulates satellite cell proliferation – important for muscle repair after training.
Cholesterol Synthesis
HMB is an intermediate product in the mevalonate pathway (cholesterol biosynthesis). It provides cholesterol for cell membranes, which can be particularly relevant for muscle cell integrity after intense training.
Who benefits most from HMB?
| Target Group | Benefit | Evidence |
|---|---|---|
| Beginner exercisers | ⭐⭐⭐⭐⭐ Strongest effect | Well-documented |
| Older athletes (60+) | ⭐⭐⭐⭐ Muscle preservation, sarcopenia prevention | Well-documented |
| Calorie deficit (diet) | ⭐⭐⭐⭐ Muscle protection | Moderately documented |
| Advanced athletes | ⭐⭐ Minimal | Mixed |
HMB Forms
- HMB-Ca (Calcium Salt): The classic, most studied form. Takes effect within 1–2 hours after intake.
- HMB-FA (Free Acid): Newer form, absorbed faster (peak after ~30 min). Possibly acutely more effective, but more expensive and fewer long-term studies.
Dosage
| Application | Dose | Timing |
|---|---|---|
| Standard Protocol | 3 g/day (3 × 1 g) | Distributed with meals |
| Around Training (HMB-FA) | 1 g before training | 30 min before training |
| Muscle Preservation in Older Age | 3 g/day | Daily, even on non-training days |
Critical Assessment of the Study Situation
HMB is a good example of how important it is to consider study quality and context. Early studies (especially by Steven Nissen, the patent holder) showed impressive results. Newer, independent studies show significantly more moderate effects – especially in trained athletes. The effect appears to be highly dependent on the initial state: The more muscle breakdown is threatened (beginners, elderly, calorie deficit), the stronger the HMB effect.
Frequently Asked Questions (FAQ)
Is HMB better than Leucine?
Not generally. Leucine is a stronger MPS trigger. HMB is better for anti-catabolism. For muscle building, leucine (via whey protein, etc.) is usually the better choice.
Related Terms
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