Can You Take L-Theanine and Suntheanine (L-Theanine) Together?

Use extra care with this pair

The short answer

Suntheanine is a patented pure L-Theanine produced by enzymatic synthesis. Taking generic L-Theanine alongside Suntheanine provides a double dose of the same compound, which may cause excessive sedation and drowsiness.

How to arrange timing

Do not combine Suntheanine with generic L-Theanine as they are the same compound. Choose one form.

Reference

Reference noted for this combination: Nobre AC, et al. L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pac J Clin Nutr. 2008;17 Suppl 1:167-168.

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.