Can You Take Vitamin B1 and Caffeine Together?

May affect absorption

The short answer

Caffeine may increase the excretion of thiamine (B1) and reduce its absorption when consumed simultaneously.

How to arrange timing

Space these at least 1-2 hours apart.

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.