Does Grapefruit Affect Berberine?

Amount or timing may matter

The short answer

Grapefruit inhibits CYP3A4 which metabolizes berberine. This may increase berberine blood levels and side effects.

How to arrange timing

Avoid grapefruit when taking berberine.

Reference

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