Can You Take Glutamine Peptides and Sustamine (L-Alanyl-L-Glutamine) Together?

May affect absorption

The short answer

Sustamine is L-alanyl-L-glutamine, a dipeptide form of glutamine. Combined with glutamine peptides, the total glutamine load may exceed beneficial levels, causing GI discomfort without additional performance benefit.

How to arrange timing

Choose one glutamine source. Sustamine already provides superior bioavailability compared to free glutamine.

Reference

Reference noted for this combination: Harris RC et al. L-glutamine absorption is enhanced after ingestion of L-alanylglutamine compared with the free amino acid or wheat protein. Nutr Res. 2012;32(4):272-277

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.