Does Caffeine Affect Iron?

May affect absorption or how you feel

The short answer

Caffeine reduces iron absorption by up to 80% due to polyphenol binding in the gut.

How to arrange timing

Take iron supplements at least 2 hours apart from coffee or 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.