TL;DR
Yes. Modern stabilised niacinamide and vitamin C are safe together; use vitamin C in the AM for antioxidant protection and niacinamide any time for tone and barrier support.
- Old myth
- Early studies said they cancel — false for stabilised forms
- Best split
- Vitamin C AM, Niacinamide AM or PM
- Benefit
- Antioxidant + pigment control + barrier
- If irritated
- Use on alternate routines
The direct answer
You can absolutely combine them. The old claim that niacinamide and vitamin C deactivate each other came from unstable, old formulas; today’s stabilised forms work well side by side and even complement each other.
How to layer
- AM: cleanse → vitamin C serum → niacinamide → moisturiser → SPF.
- Or keep niacinamide for PM if you prefer a simpler morning.
- Both are water-based; apply thinnest first, wait 30–60 seconds between.
Why pair them for PIH
Vitamin C neutralises UV-generated free radicals (prevents new pigment); niacinamide slows melanin transfer to skin cells (fades existing marks). Together they cover prevention and correction.
FAQ
Will they cause flushing or redness?
Generally no with stabilised products. If your skin is sensitive, start niacinamide at 4% and vitamin C at 10–15%, then build up.
Which goes on first?
Order matters little for efficacy; apply the lighter serum first. Many prefer vitamin C first in the morning for antioxidant layering under SPF.
Can I add retinol too?
Yes, but keep retinol at night and separate from vitamin C. Niacinamide can be used alongside retinol to reduce irritation.