Niacinamide appears in everything from gentle moisturizers to concentrated 15% treatment serums, which can make it seem as though the highest percentage must deliver the best results.
But niacinamide does not work that simply.
Human studies have reported improvements in pigmentation, barrier function, facial sebum, texture, and visible signs of aging at concentrations ranging from about 2% to 5%. Higher-concentration products also exist, but a higher number on the bottle doesn't automatically mean a better formula.
That distinction matters most when comparing Korean skincare. A 2% niacinamide serum built around propolis does a very different job than a 10% formula combined with tranexamic acid and arbutin, or a 15% serum designed around oiliness and visible pores.
So the more useful question is not simply, “How much niacinamide does it contain?” It is what that concentration is being used to accomplish.
What Exactly Is Niacinamide?
Niacinamide, also called nicotinamide, is a form of vitamin B3.
The NIH Office of Dietary Supplements explains that dietary niacin includes nicotinic acid and nicotinamide, and that vitamin B3 contributes to the formation of NAD and NADP, coenzymes involved in cellular metabolism. The body can also synthesize some niacin from the amino acid tryptophan.
When niacinamide is applied topically, research suggests effects relevant to several areas of skin biology, including epidermal barrier lipids, pigmentation, facial sebum, and signs of photoaging.
But those effects come from different studies using different concentrations and finished formulas. That is why you shouldn't treat “niacinamide” as if every niacinamide product works the same way.
What Does Human Research Actually Show?
Uneven Pigmentation
Niacinamide has meaningful human evidence for improving the appearance of uneven pigmentation.
Research published in the British Journal of Dermatology found that topical niacinamide reduced visible hyperpigmentation. Mechanistic experiments in the same research suggested that niacinamide affected melanosome transfer from melanocytes to surrounding keratinocytes rather than directly suppressing tyrosinase activity.
That distinction is useful because it explains why niacinamide can complement other pigmentation ingredients that work through different mechanisms.
For example, tranexamic acid or arbutin in the same formula should not be viewed as redundant simply because niacinamide is already present.
Skin Barrier
Research also supports niacinamide's role in barrier function.
A British Journal of Dermatology study found that nicotinamide increased the synthesis of ceramides, free fatty acids, and cholesterol in experimental skin models. Topical application also increased ceramide and free fatty acid levels in the stratum corneum and reduced transepidermal water loss in dry skin.
That makes “barrier support” more than a cosmetic marketing phrase.
It does not mean niacinamide replaces a well-formulated moisturizer, however. Ceramides, humectants, emollients, and occlusive ingredients continue to serve their respective functions.
Facial Oiliness
Human evidence also supports niacinamide's reputation for oily skin, though the findings warrant nuance.
Separate clinical trials evaluated a moisturizer containing 2% niacinamide in Japanese and Caucasian participants. In the Japanese trial, sebum excretion rate decreased significantly after two and four weeks. In the Caucasian study, facial sebum levels decreased after six weeks, whereas the measured sebum excretion rate did not change significantly.
So niacinamide may be useful in routines for oily-looking skin, but it is too simplistic to say that it universally “regulates sebum” in everyone.
Texture and Visible Signs of Aging
Researchers have also studied niacinamide beyond pigmentation and oiliness.
A 12-week double-blind, randomized split-face study involving 50 women compared a moisturizer containing 5% niacinamide with the same moisturizer without niacinamide. The niacinamide-treated side showed significant improvements in fine lines and wrinkles, hyperpigmented spots, texture, red blotchiness, and skin yellowing.
The study provides useful human evidence, but it also deserves context: Procter & Gamble employed the researchers and funded the work, and the trial evaluated a finished moisturizer, not isolated niacinamide.
That does not make the findings meaningless. It simply means they should be interpreted as evidence for that studied formula and concentration, not proof that every 5% niacinamide serum will produce identical results.
Does More Niacinamide Mean Better Results?
Not necessarily.
This is one of the most important distinctions when choosing a niacinamide product.
Useful human evidence exists at 2%, 4%, and 5%, including studies involving facial sebum, pigmentation, barrier function, and visible signs of aging.
So you shouldn't automatically dismiss a 2% product just because 10% and 15% serums are available.
Higher concentrations can still have a place. A brand may deliberately formulate a treatment around 10% or 15% niacinamide, especially for people targeting oiliness, blemish-related marks, or uneven texture.
But concentration tells you how much niacinamide is present—not whether the finished formula is better for your particular skin.
A 15% niacinamide treatment and a 2% propolis serum are not competing to do exactly the same job.
This is why the supporting ingredients matter almost as much as the percentage itself.
What to Look for in a Niacinamide Formula
Start with a clearly disclosed concentration when a product is marketed primarily as a niacinamide treatment.
Then look at what accompanies it.
A pigmentation-focused formula may combine niacinamide with tranexamic acid, arbutin, or N-acetylglucosamine. An oil-focused formula may include Zinc PCA. A lower-percentage formula may place niacinamide inside a broader hydrating or soothing serum rather than making it the dominant active.
Do not try to calculate an undisclosed percentage from INCI position alone. Ingredient order can tell you something about formula structure, but it cannot reliably give you an exact concentration.
And do not rank products solely by the niacinamide number.
The three Korean formulas below are useful because each represents a genuinely different way of using the ingredient.
How to Choose the Right Niacinamide Product
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| Product Name | Best For | Formula Details | Key Feature |
|---|---|---|---|
| Anua Niacinamide 10% + TXA 4% Serum | Dark Spots & Uneven Tone | 10% Niacinamide, 3rd Ingredient | + 4% TXA & 2% Arbutin |
| COSRX The Niacinamide 15 Serum | Oily Skin & Visible Pores | 15% Niacinamide + Zinc PCA | Sebum & Pore Care |
| Beauty of Joseon Glow Serum (Propolis + Niacinamide) | Lower-Strength Daily Care | 2% Niacinamide + 60% Propolis | Gentle Daily Glow |
For Dark Spots and Uneven Tone: Anua Niacinamide 10% + TXA 4% Serum
• Best for: Uneven-looking tone, dark spots, and post-blemish marks
Anua officially discloses 10% niacinamide, 4% tranexamic acid, and 2% arbutin. Its current ingredient list places niacinamide immediately after water and glycerin, followed by tranexamic acid.
That makes this more than a high-percentage niacinamide serum.
A randomized, double-blind study in 42 Korean women tested a moisturizer containing 2% niacinamide + 2% tranexamic acid for eight weeks and found greater improvement in irregular facial pigmentation than vehicle.
That study did not test Anua and used different concentrations, so it should not be interpreted as proof of this serum's exact results. It does, however, provide a reasonable clinical rationale for combining niacinamide and tranexamic acid in a pigmentation-focused formula.
Anua adds another pigmentation ingredient with arbutin, while the broader formula also includes multiple forms of hyaluronic acid, panthenol, Ceramide NP, Centella-derived compounds, and 3-O-ethyl ascorbic acid.
The appeal isn't simply “10% niacinamide.” Itis a multi-pathway formula built specifically around uneven tone.
Choose this if pigmentation is your main concern and you want niacinamide combined with dedicated tone-focused actives rather than used alone.
• Where to buy: Amazon, Ulta
For Oily Skin and Visible Pores: COSRX The Niacinamide 15 Serum
• Best for: Oily or combination skin, excess shine, and visible pores
COSRX officially discloses 15% niacinamide. The current INCI is relatively concise, with niacinamide following water and pentylene glycol.
The supporting ingredients make the formula more interesting than its percentage alone.
It contains N-acetylglucosamine (NAG), Zinc PCA, allantoin, and tocopherol.
NAG is especially relevant because a 10-week randomized, double-blind, vehicle-controlled study involving 202 women evaluated a regimen containing 4% niacinamide + 2% NAG and found significantly greater reductions in visible irregular facial pigmentation than vehicle.
Again, that trial used a different finished formula and different concentrations, so it does not prove the performance of this COSRX serum. It does show that the niacinamide-plus-NAG combination has clinical precedent.
COSRX positions this product for oily, combination, and blemish-prone skin and confirms the presence of Zinc PCA alongside 15% niacinamide.
Choose this if oiliness and visible pores are your priority and you specifically want a concentrated, niacinamide-forward treatment rather than a broader pigmentation serum.
• Where to buy: Amazon, Costco
For Lower-Strength Daily Care: Beauty of Joseon Glow Serum (Propolis + Niacinamide)
• Best for: Someone who wants niacinamide within a propolis-focused daily serum rather than as a high-strength treatment
Beauty of Joseon takes almost the opposite approach.
The brand discloses 60% propolis extract and 2% niacinamide, making this a propolis-forward formula rather than a concentrated niacinamide treatment.
That 2% should not automatically be viewed as insignificant. Human trials have reported measurable effects on facial sebum from products containing 2% niacinamide.
The formula also contains betaine salicylate, which Beauty of Joseon identifies as a BHA, along with glycerin, sodium hyaluronate, Centella asiatica extract, tea tree extract, turmeric extract, and tocopherol.
That matters when interpreting results. If this serum helps with texture or congestion, you can't automatically credit those changes to niacinamide alone.
It also means this isn't necessarily the best choice for every highly sensitive skin type simply because the niacinamide concentration is lower; Beauty of Joseon recommends patch testing for sensitive skin.
Choose this if you prefer a lower-niacinamide formula where propolis and supporting ingredients play a larger role than the label percentage suggests.
• Where to buy: Amazon, CVS, Ulta
Ingredients That Pair Well with Niacinamide
One of niacinamide's biggest advantages is its versatility. It works well with many active ingredients and can easily fit into most skincare routines:
- Vitamin C — Vitamin C helps brighten the skin and provides antioxidant protection, while niacinamide helps improve skin tone and strengthen the skin barrier.
- Hyaluronic Acid — Hyaluronic acid attracts moisture to the skin, and niacinamide helps reduce moisture loss by supporting the skin barrier. Together, they help keep skin hydrated and comfortable.
- Ceramides — Help support the skin's natural moisture barrier and maintain healthy hydration.
- Retinol — Retinol encourages skin renewal, while niacinamide helps reduce dryness and irritation by supporting the skin barrier.
- Peptides — Peptides help improve skin firmness, while niacinamide supports hydration and overall skin health.
- Tranexamic Acid — Particularly relevant in pigmentation-focused routines; topical combinations of niacinamide and TXA have been evaluated clinically.
Nutrients That Support Normal Vitamin B3 Metabolism
Topical niacinamide and dietary vitamin B3 are not interchangeable.The NIH explains that niacin includes nicotinic acid and nicotinamide and that the body can also convert some dietary tryptophan into niacin equivalents.
- Niacin (Vitamin B3) — Supports the formation and function of NAD and NADP throughout the body.
- Tryptophan — An essential amino acid that can contribute to the body's niacin supply.
- Vitamin B6 — Participates in amino acid metabolism, including pathways involving tryptophan.
- Riboflavin (Vitamin B2) — Contributes to normal energy metabolism and biochemical pathways involved in nutrient conversion.
Adequate nutrition supports normal vitamin B3 metabolism, but eating more niacin does not reproduce the localized effects of a topical niacinamide formula.
Frequently Asked Questions
Can I use niacinamide every day?
Many niacinamide products are designed for daily use, but the frequency should still be based on the full formula and your skin's tolerance. A simple 2% serum and a concentrated 15% treatment shouldn't be approached in exactly the same way.
Can niacinamide cause purging?
Niacinamide is not typically considered a cell-turnover active like retinoids or exfoliating acids. New breakouts after starting a product may instead reflect irritation, sensitivity to the formula, or an interaction with another active ingredient.
Can I use niacinamide with retinol?
Niacinamide and retinoids can be part of the same routine. Because niacinamide has evidence related to barrier function, it can be particularly useful in routines that also contain potentially drying actives, although the tolerability of the complete formulas still matters.
Can I use niacinamide with vitamin C?
Yes. Modern niacinamide and vitamin C products do not need to be universally separated. You can include both in the same routine if your skin tolerates the formulations well.
Sources & Further Reading
DermNet — Nicotinamide
The researchers were affiliated with Procter & Gamble, an important consideration when interpreting the results.
Related Articles
- Ceramides for Skin: How They Support the Skin Barrier and What to Look for in a Formula
- Vitamin C for Skin: What the Research Shows and How to Choose the Right Form and Concentration
- Hyaluronic Acid for Skin: How It Hydrates and Whether Molecular Weight Really Matters
- Retinol for Skin: What It Really Does, How to Use It, and How Retinal Compares
- Peptides for Skin: What the Research Shows and How to Choose a Korean Peptide Formula
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