HMB (beta-hydroxy-beta-methylbutyrate) is a leucine metabolite marketed for recovery and muscle mass. Its relevance depends strongly on the population and exercise context: results are more uncertain in already-trained young athletes than marketing suggests.
What is HMB? HMB is a metabolite of leucine. Calcium HMB and free-acid HMB have been studied. Faster absorption of HMB-FA does not prove better sporting outcomes.
What do athlete studies show? > [!evidence-conflicting] The results are not uniform > The ISSN position stand reports favorable signals for some muscle-damage markers and intense training contexts. A 2020 meta-analysis in young adults found no significant improvement in lean mass or strength. A 2025 network meta-analysis found null or very uncertain effects across several outcomes in trained athletes.
When is the question most relevant? The most plausible context is unusual stress or reduced stimulation: starting training, returning after a break, heavy loading, immobilisation or older age. This does not mean HMB prevents injury, treats disease or guarantees recovery. For a well-fed recreational athlete who already trains consistently, added benefit is uncertain.
Studied doses: a reference, not a prescription Trials often use about 3 g HMB daily, sometimes split into three servings over several weeks. The ISSN also discusses about 38 mg/kg/day in some protocols. These are research regimens, not universal doses.
05FAQ ### Is HMB better than protein? No. It is not a complete protein or a substitute for adequate food.
01Does HMB build muscle? In young resistance-trained adults, pooled data show no clear benefit; other groups may differ.
المصادر
دراسات محكّمة ومراجع مؤسسية استُخدمت لهذا المقال.
- 1International Society of Sports Nutrition· 2025إرشادات رسميةمحتملعرض المصدر
- 2Journal of Cachexia, Sarcopenia and Muscle / PMC· 2025مصدر آخرمحدودعرض المصدر
- 3Frontiers in Nutrition / PMC· 2025تحليل تَلْوِيغير كافٍعرض المصدر
- 4Nutrients / PubMed· 2020تحليل تَلْوِيمتضاربعرض المصدر
- 5PubMed· 2018تجربة عشوائية محكومةمحدودعرض المصدر
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بقلم
Claire Mercier
Registered nutritionist focused on whole-food diets and metabolic health.
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