Can You Take Guarana and Phenibut Together?

Dose or timing may matter

The short answer

Guarana's caffeine-driven stimulation may counteract phenibut's potent GABAergic sedation.

How to arrange timing

Separate by several hours based on desired effect.

Reference

Reference noted for this combination: Haskell et al., 2007, J Psychopharmacol

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.