Can You Take Vitamin B3 and Vitamin C Together?

May affect absorption

The short answer

High-dose vitamin C may convert some niacin to niacinamide, potentially reducing the vasodilatory (flushing) effects but also altering bioavailability.

How to arrange timing

Take at least 1 hour apart if using high-dose niacin for cardiovascular purposes.

Reference

Reference noted for this combination: NIH ODS 2024

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.