Niacinamide for Oily Skin: 5% vs 10% (Which to Use)
Niacinamide for oily skin, explained: what it does, 5% vs 10% strength, how to slot it into your routine, plus gentle picks from budget to premium.
Short answer: Niacinamide (vitamin B3) is a gentle, low-conflict ingredient commonly used in oily-skin routines for the look of shine, pores and barrier support. A controlled study found a 2% niacinamide moisturizer lowered some measures of facial sebum, and separate controlled studies assessed 5% for appearance outcomes. No study we found shows that 10% or 12% works better than 5%. Follow the product label, patch-test first, and layer it under moisturizer and SPF.
What niacinamide actually is
Niacinamide is a form of vitamin B3, used in skincare as a water-soluble active. You'll see it on ingredient lists either as the headline star (a dedicated serum) or as a quiet supporting player inside cleansers, moisturizers, and sunscreens.
Part of why it's so common: it's one of the safer first actives to try. It doesn't need a specific pH to "work" the way a vitamin C or an exfoliating acid does, it isn't known to make skin more sun-sensitive the way some acids or retinoids can, and it generally plays nicely alongside other ingredients. That's why it shows up in so many formulas — and why it's an easy first "active" if you're new to building a routine.
Why oily skin tends to like it
Niacinamide is widely used in cosmetics for a few things oily-skin readers care about:
- The look of shine and oil balance. It's commonly associated with a more balanced, less greasy appearance through the day. In one controlled study, a 2% niacinamide moisturizer lowered some measures of facial sebum (details in the strength section below). Results are individual and not guaranteed.
- The appearance of pores. Oily skin often comes with more visible pores. Niacinamide is frequently included in "pore-refining" formulas to make pores look less prominent — a cosmetic, surface-level effect, not a structural change.
- Barrier support. The trap with oily skin is over-stripping it with harsh cleansers and treatments, which can leave it tight and reactive. Niacinamide is widely used to support a healthy-looking barrier, which is part of why it pairs so well with the rest of an oily routine.
Important: these are cosmetic, appearance-level reasons people choose niacinamide. It is not a treatment for acne or any skin condition. For persistent breakouts, painful cysts, or anything that worries you, see a dermatologist.
If you're still sorting out the basics, our oily-skin AM/PM routine shows exactly where a niacinamide serum slots in.
What strength: 5% vs 10%, and what the evidence actually shows
This is where most people overthink it, and where the evidence is narrower than product labels suggest. Here is what the controlled studies we found actually tested:
| What was studied | What it found | What it does not show |
|---|---|---|
| 2% niacinamide moisturizer: a placebo-controlled trial in Japan (4 weeks) and a randomized split-face trial in white adults (6 weeks) | Lower facial sebum measures, though in the 6-week trial only one of the two sebum measures fell (Draelos et al., 2006) | What a serum at a different strength or in a different formula will do |
| 5% niacinamide moisturizer vs the same moisturizer without it, 12 weeks, women aged 40–60 | Improvements in the look of fine lines, spots, texture and red blotchiness, in a study run by a skincare manufacturer (Bissett et al., 2004) | Anything about oily skin specifically, or about 10% |
| 5% niacinamide moisturizer, and 2% niacinamide combined with sunscreen, controlled studies in Japanese women | Less visible hyperpigmentation after 4 weeks, also in studies run by a skincare manufacturer (Hakozaki et al., 2002) | That a higher percentage works better |
10% and 12% are marketed product strengths, not evidence-based tiers. Many popular serums are sold at 10% or 12%, but none of the studies above used those strengths, and none compared 5% with 10% head to head. A higher number on the bottle is not evidence of a better result, and the result from one formula cannot be assigned to every serum.
If you're new to niacinamide or your skin is easily irritated, a lower-strength formula is a reasonable place to start. If a 10% product leaves your skin feeling tight or looking flushed, treat that as a signal to use it less often or switch to a lower strength, not to push higher.
Some people report a mild flush or tingle when they start using niacinamide. If it persists or is uncomfortable, use it less often or stop.
What this evidence can and cannot show
- What it can show: in these controlled studies, specific 2% and 5% niacinamide moisturizers changed measured sebum or the look of the skin compared with a control product.
- What it cannot show: what a different product will do. Each study used one specific formulation and one population (adults in Japan, white adults, women aged 40–60, Japanese women). None compared 5% with 10% head to head, and none establishes that a higher percentage is better.
- Who ran them: two of the three studies were run by researchers at a skincare manufacturer. That does not make them wrong, but it is worth knowing.
- What it is not: evidence that niacinamide treats acne or any skin condition. The benefits discussed here are cosmetic.
How to add it to your routine (and what to pair it with)
Niacinamide is one of the easiest actives to slot in because it's flexible and low-conflict.
Where it goes: after cleansing, on clean skin, before your moisturizer. It works AM, PM, or both.
How to introduce it: follow the product label and patch-test first. If irritation occurs, use it less often or stop. Adding one new product at a time makes it easier to tell what your skin is reacting to, and avoids the tight, irritated feeling that makes people quit an ingredient that would've suited them.
What to pair it with (keep it gentle):
- A non-stripping cleanser — for most oily skin, a gel cleanser is the better default. See our gel vs foam cleanser breakdown.
- A lightweight, oil-free moisturizer on top — niacinamide is not a substitute for moisturizer. See our best moisturizers for oily skin roundup for picks by tier.
- A non-greasy SPF every morning (niacinamide doesn't replace sunscreen).
What to go slow with: introducing niacinamide at the same time as a brand-new exfoliating acid or retinoid is a recipe for irritation you can't diagnose. Add one new thing at a time.
Product picks by tier
All real, currently-sold products. We link, we don't price — tiers below are about positioning, not cost. The percentages are the strengths each product is sold at, not a ranking of results.
| Tier | Pick | Why it's here |
|---|---|---|
| Budget (5%) | Good Molecules Niacinamide 5% Serum with Ectoin | A lower-strength 5% serum — a reasonable starting point if you want to begin below 10% |
| Budget (10%) | The Ordinary Niacinamide 10% + Zinc 1% | The best-known budget option — a straightforward 10% niacinamide serum with 1% zinc PCA; widely available |
| Mid | Paula's Choice 10% Niacinamide Booster | A 10% booster the brand says you can use alone or mix into a moisturizer |
| Premium | Naturium Niacinamide Serum 12% Plus Zinc 2% | Sold at 12% with 2% zinc and hyaluronic acid — for people who specifically want a higher-percentage formula; no study we found shows 12% works better than 5% or 10% |
| Get it in a moisturizer | CeraVe PM Facial Moisturizing Lotion | Contains niacinamide in a lightweight, oil-free night moisturizer — a low-effort way to include it without adding a separate serum |
A practical note: if you'd rather not add another step, getting niacinamide inside your moisturizer (like the CeraVe PM) is a perfectly legitimate route. You don't need a dedicated serum to include the ingredient.
If you want a deeper look at the most popular starter, see our The Ordinary Niacinamide 10% review. And if you're weighing The Ordinary against Paula's Choice more broadly, we compared them in The Ordinary vs Paula's Choice.
Affiliate link. We may earn a commission if you buy through it, at no extra cost to you. It never changes what we recommend.
The Ordinary Niacinamide 10% + Zinc 1%
The brand's bestseller — 10% niacinamide with 1% zinc in a plain, fragrance-free base. Strong at 10%, so patch-test first and watch for pilling under other products.
How we researched this guide
- Independent ingredient studies: a controlled trial of a 2% niacinamide moisturizer and facial sebum (PubMed 16766489); a controlled 12-week study of a 5% niacinamide moisturizer and visible facial-skin outcomes (PubMed 18492135); and controlled 2% and 5% niacinamide pigmentation studies (PubMed 12100180). Abstracts checked 11 October 2026.
- What we did not do: NeedSkincare has not first-party tested these products, and this guide is not a clinical assessment.
For more, see CeraVe AM vs PM Lotion.
Frequently asked questions
Is 10% niacinamide too strong for oily skin?
There is no fixed answer. 10% is a common marketed strength, but the controlled studies we found used 2% and 5%, and none compared 5% with 10% directly. Follow the product label and patch-test first. If a 10% product leaves your skin tight, flushed, or irritated, use it less often or stop, and consider a lower-strength formula rather than pushing through. Strength should match your skin's tolerance, not the number on the bottle.
Do you use niacinamide before or after moisturizer?
Before. Apply niacinamide to clean skin first, then lock it in with moisturizer. It's a thin, water-based serum, so it goes under heavier, creamier layers — and SPF goes on last in the morning.
Can I use niacinamide with vitamin C, retinol, or exfoliating acids?
Generally yes — niacinamide is low-conflict and is often layered with other actives. The real risk isn't a chemical clash; it's piling on too many new things at once and irritating your skin. Introduce one new active at a time so you can tell what's working and what isn't. If you're combining several strong actives, a dermatologist can help you sequence them.
How long until I see a difference with niacinamide?
There is no promised timeline. In the controlled studies cited above, changes were measured after 4 to 12 weeks of use with 2% and 5% formulas; that is what those studies measured, not a guarantee for any particular serum, and some people notice little change at all. Treat it as a steady, supportive part of a routine rather than an overnight fix. If your main concern is active or painful breakouts, that's a conversation for a dermatologist, not a serum swap.
Does niacinamide stop oily skin from being oily?
It won't change your skin type. It's used for the look of balance and shine through the day — a cosmetic, appearance-level effect that varies person to person. A higher niacinamide percentage is not a proven fix either; a non-stripping cleanser and a lightweight moisturizer are the other parts of the routine to get right.
Related guides
We're an independent research team, not medical professionals. The benefits described here are cosmetic, and results vary from person to person. For acne, persistent irritation, pregnancy-safe routines, or any medical concern, please check with a dermatologist.
Every claim on NeedSkincare is sourced from published ingredient research and manufacturer data. We're an independent research team, not medical professionals — for anything medical, check with your dermatologist.