Can You Use Niacinamide and Vitamin C Together? What the Science Says

One of the most repeated rules in skincare is that you should never use niacinamide and vitamin C together — supposedly they cancel each other out or turn into something irritating. It is one of the most persistent myths in skincare, and the research says the opposite. Here is what is actually true, and exactly how to use both.

Where the myth came from

The claim traces back to laboratory studies from the 1960s showing that niacinamide and L-ascorbic acid could react to form nicotinic acid, a compound that can cause temporary flushing. The catch: that reaction required sustained high heat over long periods — conditions that simply never happen on your skin or inside a modern, stabilized formula. A 2021 review of nicotinamide research confirms the concern does not apply to real-world use.

What the research actually shows

In real formulations, niacinamide and vitamin C are stable and well tolerated together. Niacinamide (vitamin B3) is one of the most broadly compatible actives in skincare — a 2024 review of its mechanisms highlights that it strengthens the skin barrier, calms inflammation, and regulates oil, with no meaningful conflicts against other ingredients. Vitamin C, meanwhile, is a potent antioxidant that neutralizes free radicals, supports collagen, and brightens uneven tone, as summarized in this clinical review of topical vitamin C.

Why pairing them is actually a good idea

The two are complementary. Vitamin C brings antioxidant defense and brightening; niacinamide adds barrier support, oil control, and redness relief. Used together they cover tone, texture, and barrier health in one routine — and niacinamide can even reduce the tingling some people feel from vitamin C.

How to use them together

• Layer them: in the morning, apply your vitamin C serum first, then niacinamide, then moisturizer and SPF.
• Or use a combined formula. A good starting point for niacinamide is The Ordinary Niacinamide 10% + Zinc 1%, and the CeraVe Skin Renewing Vitamin C Serum already pairs 10% vitamin C with barrier-supporting ceramides.
• Very sensitive skin? Split them — vitamin C (try SkinCeuticals C E Ferulic) in the morning, niacinamide at night.

The bottom line

You can absolutely use niacinamide and vitamin C together — the "they cancel out" rule is a myth built on lab conditions that do not exist on your face. For the full, cited breakdown of which skincare ingredients really conflict (and which pairings are myths), see our skincare ingredient guide.