A niacinamide serum is one of the easiest active products to add to a routine. Niacinamide, also called nicotinamide, is a form of vitamin B3. It is well tolerated by most skin types, stable in the bottle, and useful for several common concerns at once: oiliness, uneven tone, a weak skin barrier and the look of pores.
What this guide draws on
Recommendations in this guide come from published information on niacinamide, common formula designs and label conventions. We did not trial individual serums, so the advice is about what to look for, not which product to buy.
What niacinamide can do
- Support the skin barrier by helping the skin to make its own ceramides.
- Reduce the look of excess oil and shine in some people.
- Even out skin tone and fade dark marks gradually.
- Calm redness and help blemish-prone skin.
- Soften the look of enlarged pores, mainly by reducing oil.
Results are modest and gradual. It is a supporting ingredient, not a dramatic treatment.
Strength
| Strength | What to know |
|---|---|
| 2% to 5% | The range used in most studies; effective and gentle |
| 10% | Very common in serums; fine for many people; may cause flushing or irritation in some |
| 15% to 20% | Little evidence of extra benefit; more risk of irritation |
More is not better. If a 10% serum makes your skin red or itchy, a 4% or 5% product may suit you well.
Formula features to look for
- Water-based, lightweight texture. It layers easily under other products.
- Supporting ingredients. Zinc is often added for oily skin. Hyaluronic acid, glycerin and panthenol add hydration. Ceramides suit dry or sensitive skin.
- Fragrance-free, if your skin is reactive.
- Simple packaging. Niacinamide is stable, so it does not need special bottles.
Niacinamide is also found in many moisturizers, sunscreens and cleansers. If your moisturizer already contains it, a separate serum may be unnecessary. Using several niacinamide products together adds up, and can cause irritation.
Who it suits
| Skin type or concern | How niacinamide helps |
|---|---|
| Oily or combination | Reduces shine; suits both oily and dry zones. See Skincare Routine for Combination Skin |
| Acne-prone | Calming; supports the barrier during drying treatments |
| Dry or sensitive | Supports barrier repair. See Skin Barrier Care: How to Build a Gentle Routine |
| Uneven tone, dark marks | Gradual brightening over months |
| Mature skin | Barrier support and tone |
How to use it
- Cleanse.
- Apply a few drops to the face, morning or evening, or both.
- Follow with moisturizer.
- Use sunscreen in the morning.
It can be layered with most ingredients, including hyaluronic acid, retinol and acids. Many people find that it makes retinol easier to tolerate. See How to Layer Serums and Moisturizers.
Niacinamide and vitamin C
An old belief holds that the two cancel each other out. That idea came from early studies using unstable forms under conditions that do not match modern products. They can be used in the same routine. If the combination irritates your skin, apply vitamin C in the morning and niacinamide at night. See Vitamin C Serum Buying Guide: Ingredients and Packaging.
Possible side effects
- Mild redness, warmth or flushing, particularly at 10% and above.
- Itching, or small bumps.
- A slightly tacky feel with some formulas.
Stop, and try a lower strength, if these occur. Patch test first, if your skin is sensitive.
How long until you see a difference?
- Less shine: two to four weeks.
- A smoother, more even look: eight to twelve weeks.
Label claims
- "Pore-minimizing" means the appearance of pores. Pore size itself does not change.
- "With zinc" suggests a formula aimed at oily skin.
- "Brightening" refers to tone. It is not skin lightening.
- A percentage on the front is helpful. If none is given, the amount may be low.
Look up any unfamiliar ingredient in the Skincare Ingredient Checker.
Related on ArniSun
- Vitamin C Serum Buying Guide: Ingredients and Packaging
- How to Layer Serums and Moisturizers
- Skincare Routine for Combination Skin
- Skin Barrier Care: How to Build a Gentle Routine
- Skincare Ingredient Checker: Look Up Ingredient Information
Sources and further reading
Frequently asked questions
Is 10% niacinamide too strong?
It suits many people, but it can cause redness or irritation in some. Strengths of 2% to 5% are effective and gentler.
Can I use niacinamide every day?
Yes. It is suitable for daily use, morning and night, for most skin types.
Can niacinamide cause breakouts?
It does not usually cause acne. If bumps appear after starting it, the strength may be too high, or another ingredient in the formula may not suit you.