Can You Use Niacinamide and Vitamin C Together?

Yes — niacinamide and vitamin C are compatible, and using them in the same routine is entirely reasonable. The idea that they cancel each other out has circulated in skincare communities for years, but it traces back to old laboratory conditions that have little relevance to how modern skincare is formulated. Most people who use both do so without any issue.

Where did the "cancel each other out" idea come from?

The concern originates from early laboratory research in which niacinamide and pure vitamin C (ascorbic acid), when combined under heat over an extended period, could react to produce a compound associated with temporary skin flushing. That described a specific set of unstable conditions — not the stabilised, carefully formulated products available today. The finding has been repeated across beauty content long after the science moved on, which is a good example of how skincare misinformation tends to persist once it takes hold.

Current dermatological thinking is that the two ingredients sit comfortably alongside each other. In the JAAD 2025 Delphi study, niacinamide reached consensus for redness and dark spots, and vitamin C for fine lines and dark spots — they overlap around the look of uneven tone, approached through different mechanisms, which is part of why combining them can make sense.

How do you use them together?

There is no single correct answer, and the approach that works best is usually the simplest one for your routine. Applying the thinner, more liquid product first and the heavier one after is the general layering principle — if one is a dedicated treatment serum and the other is in a moisturiser, the order largely takes care of itself. Many formulas now include both ingredients together, which removes the question entirely.

Some people prefer to use vitamin C in the morning and niacinamide in the evening, keeping them separate as a matter of preference rather than necessity. There is nothing wrong with this approach, though it adds a step that most skin types do not require.

If both are new to your routine, introducing one at a time over a week or two gives you a clearer picture of how your skin responds to each. Consistency over time tends to matter more than precise layering order.

Is there anyone who should be more careful?

For most skin types, no particular caution is needed. Where occasional flushing or temporary redness has been reported — usually anecdotal rather than well-documented in research — it tends to involve very high concentrations of both ingredients used together. Starting at moderate concentrations and building up is sensible general advice for introducing any new active, and it applies here too.