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What Does Niacinamide Do?

Niacinamide is in half the serums on the shelf and all over TikTok, usually at 10%. It does real, specific things — and it is also over-hyped as a cure-all. Here is what the vitamin B3 derivative actually does for your skin, and what it does not.

By Sweat the Details Editorial Team · Published · Updated

Note: This is general educational information, not medical advice. We decode how ingredients and materials are described on labels and spec sheets; we do not lab-test.
The short answer: Niacinamide is a form of vitamin B3. It mainly helps regulate oil, refine the look of pores, and support the skin barrier. It is a supporting active, not an acne cure or a miracle ingredient. Around 5–10% is the common effective range.

What Niacinamide Actually Does

Niacinamide (vitamin B3) is one of the better-studied skincare actives, and its real benefits are specific. It helps regulate sebum, which is why oily and combination skin reach for it. It can refine the appearance of enlarged pores over time. It supports the skin barrier by helping the skin retain moisture, and it has soothing, anti-inflammatory properties that can calm redness. These are meaningful, if undramatic, benefits.

What Percentage To Use

Around 5% to 10% is the common effective range, and 10% is the popular standard. More is not better: very high concentrations do not add proportional benefit and can cause some formulas to pill or irritate. Some products add 1% zinc for extra oil control — that is what distinguishes The Ordinary's version from Good Molecules'. A well-formulated 10% is plenty for most people.

What Niacinamide Cannot Do

It is a supporting active, not a treatment for active acne or deep wrinkles. Niacinamide helps oil and the look of pores; it will not clear a breakout the way a salicylic acid (BHA) can, and it is not a retinoid. The marketing often overstates it. Think of it as a gentle, everyday supporting player that makes a routine better — not the star that fixes everything. Pair it with the right actives for your actual concern.

What It Pairs With

Niacinamide plays well with almost everything, including vitamin C. The old warning against combining niacinamide and vitamin C is largely outdated for modern formulas. If your skin is sensitive, simply use vitamin C in the morning and niacinamide at night. It also layers safely with hyaluronic acid, snail mucin, and BHA. For the full order, see our layering guide.

FAQ

What does niacinamide do for your skin?

Niacinamide, a form of vitamin B3, mainly helps regulate oil, refine the appearance of pores, and support the skin barrier by improving moisture retention. It also has soothing, anti-inflammatory properties. It is a supporting active rather than a cure for any single concern.

What percentage of niacinamide should I use?

Around 5 to 10 percent is the common effective range, with 10 percent being the popular standard. Higher concentrations do not add proportional benefit and can cause some formulas to pill or irritate, so a well-formulated 10 percent is enough for most people.

Does niacinamide help with acne?

It can support oil control and calm inflammation, which may help acne-prone skin, but it is not a dedicated acne treatment. For clearing blackheads and congestion, a salicylic acid (BHA) is more targeted. Niacinamide works best as a supporting active alongside the right treatment.

Can you use niacinamide with vitamin C?

Yes. The old caution about combining them is largely outdated for modern formulas. If your skin is sensitive, use vitamin C in the morning and niacinamide at night. Both can be used daily and niacinamide layers safely with most other actives.

Learn more: BHA vs AHA explained · how to layer niacinamide, vitamin C & BHA
See it in our reviews: The Ordinary Niacinamide · Good Molecules · best serums for oily skin