Does Caffeine Affect GABA?

Amount or timing may matter

The short answer

Caffeine antagonizes GABA receptor activity. It directly opposes GABA's calming and anxiolytic effects at the neuronal level.

How to arrange timing

Separate GABA supplements from caffeine by at least 4 hours for optimal calming effect.

Reference

Reference noted for this food and supplement combination: Examine.com 2024; Daly et al. 1983

Important context

The effect can also change with food amount, supplement 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.