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Ingredient glossary
Niacinamide: What It Is and What It Does
Niacinamide is a form of vitamin B3 widely used in skincare for its role in supporting the skin barrier and helping with the appearance of oiliness and uneven tone. It is generally well tolerated, water-soluble, and is commonly found in serums and moisturisers aimed at combination and oily skin.
What it does
Niacinamide supports the skin's natural barrier function and is commonly used to help regulate the appearance of excess oil and refine the look of enlarged pores over consistent use. It is also used for its role in supporting a more even-looking skin tone. Unlike acids, it does not exfoliate — it works via supporting normal skin cell function rather than removing surface cells. Its effects tend to build gradually with regular use rather than appearing immediately.
Who it suits
Niacinamide is generally suited to a wide range of skin types, including oily, combination and sensitive skin, because it does not typically strip or exfoliate. It is often chosen by people dealing with visible pores, uneven tone or a compromised-feeling barrier. Its gentle profile means it is commonly recommended as a starting point for people new to active ingredients.
Cautions
Niacinamide is one of the better-tolerated actives, but formulas at very high concentrations can occasionally cause flushing or mild irritation in sensitive skin, particularly when introduced too quickly. There were historical reports of niacinamide reacting poorly with pure vitamin C in older formulations, though modern stabilised formulas are generally considered compatible. Anyone with a persistent skin condition should consult a pharmacist or dermatologist rather than self-treating with cosmetics.
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Frequently asked questions
- Can I use niacinamide with vitamin C?
- Modern, stabilised formulations of both are generally considered fine to use together or layered. Older concerns about the two cancelling each other out came from unstable, high-pH formulas that are uncommon today. If in doubt, using them at different times of day is a simple precaution.
- How long does niacinamide take to work?
- Most people use it consistently for around eight to twelve weeks before judging results, since visible changes in oiliness and tone build gradually with skin's natural turnover cycle rather than appearing overnight.
- Is niacinamide the same as niacin?
- They are related but not identical. Both are forms of vitamin B3, but niacin (nicotinic acid) can cause a flushing sensation when taken orally or applied topically, whereas niacinamide is the form specifically chosen for skincare because it does not typically cause that reaction.
This is general information about a cosmetic ingredient, not medical advice. It does not describe any specific product, and does not diagnose, treat or cure any condition. If you have a persistent skin or scalp concern, speak to a pharmacist, GP or dermatologist. See our editorial policy for how we handle claims.