Can You Take HMB and L-Leucine Together?

Use extra care with this pair

The short answer

HMB is a metabolite of L-Leucine. Taking both provides redundant mTOR pathway stimulation, as approximately 5% of leucine is naturally converted to HMB. The combination offers diminishing returns and may cause gastrointestinal discomfort.

How to arrange timing

Research suggests choosing either HMB or L-Leucine rather than both, as HMB is already derived from leucine metabolism.

Reference

Reference noted for this combination: Wilson JM, et al. International Society of Sports Nutrition Position Stand: beta-hydroxy-beta-methylbutyrate (HMB). J Int Soc Sports Nutr. 2013;10(1):6.

Important context

Whether supplements suit you together also depends on dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.