Can You Take L-Theanine and Caffeine Together?

Dose or timing may matter

The short answer

L-theanine promotes relaxation and alpha brain waves, while caffeine promotes alertness. They modulate each other's effects — theanine can reduce caffeine jitters while caffeine may reduce theanine's calming effect.

How to arrange timing

This combination is often taken intentionally for balanced focus. No spacing needed if desired effect is calm alertness.

Reference

Reference noted for this combination: Examine.com

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.