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

June 11, 2026

One of the most repeated claims in skincare is that vitamin C and niacinamide cancel each other out. The short answer, based on current evidence, is that they can be used together. Here is what the research actually shows.

Where the myth came from

The idea that these two ingredients should not be combined traces back to laboratory work from the 1960s. Under high heat and very low pH, pure niacinamide and pure ascorbic acid can react to form niacin, a compound linked to temporary flushing. Those were extreme conditions used to study the raw molecules, not the stable, pH-balanced formulations sold today. At normal storage and skin temperatures, this reaction is not a practical concern.

What each ingredient does

Vitamin C is one of the best-studied antioxidants in skincare. A review in Nutrients describes its central role in supporting collagen synthesis and in protecting skin against UV-induced free radical damage (Pullar et al., 2017, PMID 28805671).

Niacinamide works through different pathways. A landmark clinical study found that niacinamide reduces the transfer of pigment-carrying melanosomes from melanocytes to skin cells, with measurable improvements in the appearance of hyperpigmentation after several weeks of use (Hakozaki et al., 2002, PMID 12100180). A later review summarised its broader profile, noting photo-protective, oil-balancing and skin-tone effects that depend on concentration (Wohlrab & Kreft, 2014, PMID 24993939).

Why using them together makes sense

Because the two ingredients act on different mechanisms, pairing them is complementary rather than contradictory. Vitamin C supports antioxidant defence and collagen, while niacinamide supports a more even-looking tone and a comfortable skin barrier. Most modern serums are formulated to keep both stable.

How to layer them

A simple approach works for most people:

Apply the thinner, water-based formula first and allow it to settle for about a minute.
Follow with the next product, then moisturiser.
If your skin is new to actives, introduce one at a time so you can judge how it responds.

If you prefer to keep things separate, vitamin C in the morning and niacinamide in the evening is also perfectly reasonable. At Verdo we stock Medik8 C-Tetra vitamin C serum and Medik8 Niacinamide, and our team in Parnell can help you build a routine that suits your skin.

Disclaimer: This article is for general information only and is not medical advice. The studies cited are from peer-reviewed journals and are provided for educational context. Individual results vary. Speak with a qualified healthcare professional or dermatologist before changing your skincare routine. Verdo Cosmetics makes no therapeutic claims about the products or services mentioned.

Frequently asked questions

Do vitamin C and niacinamide cancel each other out?

Not in modern formulations. The belief comes from 1960s lab studies that combined the raw molecules under high heat and very low pH. Today's stable, pH-balanced serums do not recreate those conditions, so the two can be used together.

Should I apply vitamin C or niacinamide first?

Apply the thinner, water-based product first, wait about a minute, then apply the next layer and your moisturiser. If you would rather separate them, use vitamin C in the morning and niacinamide at night.

What does each ingredient actually do?

Vitamin C supports collagen synthesis and antioxidant protection against UV damage (Pullar et al., 2017). Niacinamide reduces the transfer of pigment to skin cells and supports an even tone and comfortable barrier (Hakozaki et al., 2002).

Can sensitive skin use both together?

Many people with sensitive skin tolerate both, but it is sensible to introduce one active at a time and patch test first. If you are unsure, speak with a skincare professional or dermatologist.

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