Does Alcohol Affect Vitamin B1?

Amount or timing may matter

The short answer

Alcohol impairs thiamine (B1) absorption and increases its excretion.

How to arrange timing

Avoid alcohol within 4 hours of taking thiamine supplements.

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.