Can You Take L-Theanine and Phenibut Together?

Use extra care with this pair

The short answer

L-Theanine and phenibut both have calming CNS effects; combined use may lead to excessive sedation.

How to arrange timing

Avoid combining without professional guidance.

Reference

Reference noted for this combination: Kimura et al., 2007, Biol Psychol

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.