Niacinamide — also called nicotinamide, a form of vitamin B3 — is one of the most researched actives in skincare. Unlike many ingredients that have a single claimed mechanism and limited evidence, niacinamide has been studied for multiple functions across decades of peer-reviewed research.
It is also water-soluble, stable, and well-tolerated by most skin types, including sensitive skin. This combination — strong evidence, multiple benefits, good tolerability — makes it genuinely unusual in an industry prone to overclaiming.
What it actually does.
Barrier function. Niacinamide increases the synthesis of ceramides, free fatty acids, and other lipids that make up the skin barrier. Multiple studies have demonstrated measurable improvement in barrier function and reduction in trans-epidermal water loss with regular niacinamide use. This is the most consistent and well-supported finding.
Pigmentation. Niacinamide inhibits the transfer of melanin from melanocytes (cells that produce pigment) to keratinocytes (skin cells). This reduces the appearance of dark spots and uneven skin tone. The research on this mechanism is solid.
Sebum regulation. Studies have shown that 2% niacinamide reduces sebum excretion in people with oily skin, which can reduce the appearance of enlarged pores and reduce breakout frequency.
Anti-inflammatory effects. Niacinamide has demonstrated anti-inflammatory properties in skin research, which is relevant for conditions involving inflammation — acne, rosacea, sensitive skin.
Collagen support. There is evidence that niacinamide supports collagen synthesis, though this effect is less pronounced than with retinoids and vitamin C.
Most skincare ingredients do one thing with varying evidence. Niacinamide does several things with good evidence for all of them. That’s genuinely unusual.
Effective concentrations.
Research has used concentrations ranging from 2% to 10%. Most of the well-documented effects occur at 4% to 5%. Higher concentrations are not necessarily more effective and can cause flushing in some people.
Niacinamide is compatible with most other skincare ingredients and can be layered with vitamin C, retinoids, AHAs, and BHAs without issue. The old advice to avoid combining it with vitamin C due to the formation of nicotinic acid is not supported by current research at standard product concentrations.
It works at any time of day, in any step of the routine, in any formulation that is stable and at an effective concentration.
If you’re going to add one evidence-based active to a skincare routine, niacinamide is a strong candidate. It’s not exciting. It doesn’t have a compelling origin story. It just works, consistently, across a broad range of concerns.
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