Does Tea Affect Vitamin B1?

May affect absorption or how you feel

The short answer

Tannins in tea may reduce thiamine (B1) availability through binding.

How to arrange timing

Take B1 at least 1 hour apart from tea.

Reference

Reference noted for this food and supplement combination: NIH ODS 2024

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.