Does Caffeine Affect Guarana?

Use extra care with this combination

The short answer

Guarana naturally contains caffeine (3-7%). Adding exogenous caffeine stacks total caffeine dose, risking tachycardia, anxiety, and insomnia.

How to arrange timing

Calculate total caffeine from all sources. Do not exceed 400mg/day combined.

Reference

Reference noted for this food and supplement combination: EFSA 2015; Examine.com

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.