Home/Ingredients/HMB (β-Hydroxy β-Methylbutyrate)/Optimum Nutrition
Optimum Nutrition HMB 1000mg, 90 capsules
BESTSELLERPERFORMANCE
OPTIMUM NUTRITION

HMB 1000mg

★★★★★4.6(1,800 reviews)
KEY INFORMATION
Serving Size3 capsules
Total Servings30
Per Serving3 g HMB
Best TimePre-workout
CERTIFICATIONS & DIET
Non-GMO Gluten Free
SPECIFICATIONS
FormCapsules
Active Ingredientβ-Hydroxy β-Methylbutyrate (Calcium HMB)
Container90 capsules
$32~/month
Buy on iHerb →Buy on Amazon →

Affiliate disclosure: links may earn us a commission at no extra cost to you.

About this product

β-hydroxy β-methylbutyrate (HMB) is a metabolite of the essential amino acid leucine. About 5% of dietary leucine is converted to HMB, which acts on the mTOR and ubiquitin-proteasome pathways to favor muscle protein synthesis and suppress muscle protein breakdown. HMB shines in catabolic states: bed rest, illness, calorie deficit, and aging. Meta-analyses show consistent benefits for lean mass retention and recovery in older adults and clinical patients, with smaller benefits in healthy younger trainees. Standard dose is 3 g per day, split or taken before training.

WHY HMB MATTERS

A leucine metabolite that suppresses muscle breakdown. Strong evidence in older adults, fasted training, and bed rest.

Read the full ingredient guide →

Not sure where to start?

Take our quiz. We'll compose a complete stack that fits your goals, body, and budget, in minutes.

Take the quiz →