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Types of HMB (Beta-Hydroxy Beta-Methylbutyrate): Forms & Bioavailability

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Forms Comparison

FormBioavailabilityBest For
Calcium HMB (HMB-Ca)GoodMost studied form — cost-effective; peak blood levels in 1-2 hours; take with food
HMB Free Acid (HMB-FA)High (faster absorption)Faster peak levels (~30 min) — may be superior acutely; more expensive; fewer long-term studies

Calcium HMB (HMB-Ca)

Bioavailability: Good. Best for: Most studied form — cost-effective; peak blood levels in 1-2 hours; take with food.

HMB Free Acid (HMB-FA)

Bioavailability: High (faster absorption). Best for: Faster peak levels (~30 min) — may be superior acutely; more expensive; fewer long-term studies.

Full HMB (Beta-Hydroxy Beta-Methylbutyrate) Guide

References

  1. (). Effect of dietary supplements on lean mass and strength gains with resistance exercise: a meta-analysis. Journal of Applied Physiology. DOI
  2. (). Effect of beta-hydroxy-beta-methylbutyrate supplementation on muscle loss in older adults: a systematic review and meta-analysis. Archives of Gerontology and Geriatrics. DOI
  3. (). Effects of leucine and its metabolite β-hydroxy-β-methylbutyrate on human skeletal muscle protein metabolism. Journal of Physiology. DOI