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What is 10% niacinamide serum? It is a water-based serum in which niacinamide, the amide form of vitamin B3, makes up 10% of the formula by weight. This page covers the ingredient itself: what niacinamide is chemically, how it differs from niacin, what published studies actually measured, and what the research does not show. If you want application steps, layering order and a daily routine, read our companion guide, How to Use 10% Niacinamide Serum.
Niacinamide at a Glance
| Property | Detail |
|---|---|
| INCI name | Niacinamide |
| Other names | Nicotinamide, vitamin B3 amide, 3-pyridinecarboxamide |
| Solubility | Highly water soluble (641 g/L at 20°C per DSM data), insoluble in oils, so it goes in the water phase |
| Supplier use level | 1% to 10% in skin care (DSM Niacinamide PC guidelines) |
| Concentrations in published skin studies | 2% to 5% in most controlled trials, 4% in several split-face studies |
| Concentrations reported in 2005 safety review | 0.0001% to 3% in products on the market at that time |
| Supplier pH window | Final formula pH 4.0 to 8.0 (DSM) |
What Niacinamide Is, Chemically
Vitamin B3 exists in two common forms: nicotinic acid (niacin) and nicotinamide (niacinamide). The two share vitamin activity in the body, but they behave differently. Niacinamide carries an amide group where niacin carries a carboxylic acid group. That small structural change matters to a cosmetic formulator for two reasons.
- Feel on skin. Niacin is well known for causing a warm, red flush. A 2021 review of the niacinamide literature in Antioxidants notes that, unlike nicotinic acid, nicotinamide does not cause flushing.
- Formula pH. Niacinamide is close to neutral in solution (DSM lists pH 6.0 to 7.5), so it sits comfortably in serums formulated near skin pH. Niacin is an acid and lowers pH.
Inside skin cells, niacinamide is a precursor of NAD+ and NADP, coenzymes cells use to handle energy and oxidative stress. The same review points out that the NAD+ pool is reported to be lower in aged skin, and that most of niacinamide's observed effects are thought to come through this coenzyme pathway rather than through one specific receptor. That is an honest summary of the science: the mechanism is a reasonable model, not a fully mapped pathway.
What the Studies Measured
Below is what peer-reviewed studies reported, with the design details that matter: who was tested, at what concentration, and for how long. Notice that none of the controlled trials summarized here used 10%. Most used 2% to 5%. That is common in cosmetic science, and it is one reason to read percentages on a label as a formulation choice, not as a promise of a stronger result.
Visible signs of aging: 5% niacinamide, 50 women, 12 weeks
Bissett and colleagues (2005, Dermatologic Surgery) ran a double-blind, split-face study in 50 white women. One side of the face received a 5% niacinamide moisturizer twice daily, the other side the same moisturizer without niacinamide, for 12 weeks. Compared with the control side, the niacinamide side showed measured reductions in the look of fine lines and wrinkles, hyperpigmented spots, red blotchiness and sallowness (yellowing). Skin elasticity, measured by cutometry, also improved.
Uneven tone: 5% and 2% niacinamide, 4 weeks
Hakozaki and colleagues (2002, British Journal of Dermatology) combined lab and human work. In a cell co-culture of keratinocytes and melanocytes, niacinamide reduced melanosome transfer, the hand-off of pigment packets from pigment cells to surface skin cells, by 35% to 68%. It did not reduce tyrosinase activity or melanin production inside the pigment cells. In people, a paired study of 18 women compared 5% niacinamide with a vehicle for 4 weeks, and a second study of 120 women compared 2% niacinamide plus sunscreen against sunscreen alone and against a vehicle. In both, niacinamide reduced the look of hyperpigmentation and increased measured skin lightness compared with the vehicle.
That mechanism is useful to understand. Niacinamide is not a tyrosinase inhibitor like many brightening ingredients. It works at a different step, which is why formulators often pair it with ingredients that act earlier in the pigment pathway.
Surface oil: 2% niacinamide, 130 people, 4 to 6 weeks
Draelos and colleagues (2006, Journal of Cosmetic and Laser Therapy) ran two studies. In 100 Japanese adults (50 niacinamide, 50 placebo), 2% niacinamide significantly lowered the measured sebum excretion rate after 2 and 4 weeks. In a 6-week split-face study in 30 white adults, casual sebum levels on the surface dropped significantly, but the sebum excretion rate did not. Two populations, two different outcomes: a good example of why one headline result should not be stretched across every skin type.
Wrinkles and texture: 4% niacinamide, 30 people, 8 weeks
The 2021 Antioxidants review summarizes a randomized, placebo-controlled split-face study by Kawada and colleagues in 30 subjects. After 8 weeks, wrinkle grades on the 4% niacinamide side were significantly lower than before application and lower than the vehicle side. Measured surface roughness was also lower.
Patchy facial discoloration: 4% niacinamide vs 4% hydroquinone, 27 people, 8 weeks
The same review describes a double-blind, left-right split-face trial in 27 people with patchy facial discoloration. Good to excellent visible improvement was reported in 44% of the niacinamide sides and 55% of the hydroquinone sides, with side effects reported on 18% and 29% of sides. The authors described the two as comparable in this setting. Hydroquinone is a drug ingredient in the United States, so this comparison is useful context, not a reason to view a cosmetic serum as a substitute for one.
Barrier lipids: lab data on keratinocytes
As summarized in the 2021 Antioxidants review, Tanno and colleagues (2000, British Journal of Dermatology) reported that niacinamide increased the synthesis of ceramides, free fatty acids and cholesterol in cultured human keratinocytes. These are the lipids that fill the spaces between surface skin cells. This was a cell study. It explains why niacinamide is described as barrier-supportive, but it is not the same thing as a measured result on a person's face.
Summary Table: Concentration, Design and Result
| Study | Niacinamide | Who and how long | What was measured |
|---|---|---|---|
| Bissett 2005 | 5% | 50 women, 12 weeks, split face | Fewer visible fine lines, spots, blotchiness and sallowness; better elasticity |
| Hakozaki 2002 | 5% and 2% | 18 and 120 women, 4 weeks; plus cell co-culture | Less visible hyperpigmentation; 35% to 68% less melanosome transfer in vitro |
| Draelos 2006 | 2% | 100 adults (4 weeks) and 30 adults (6 weeks) | Lower sebum excretion rate in one group; lower surface sebum in the other |
| Kawada (in Boo 2021) | 4% | 30 subjects, 8 weeks, split face | Lower wrinkle grades and surface roughness |
| Tanno 2000 | Lab concentrations | Cultured keratinocytes | More ceramide and barrier lipid synthesis |
Why Formulators Choose 10%
If most trials used 2% to 5%, why do so many serums, including ours, use 10%? There are practical reasons, and it is worth being clear about which are evidence and which are formulation judgment.
- Inside the supplier range. DSM recommends 1% to 10% niacinamide in skin care, so 10% is the top of the supplier range, not beyond it.
- Headroom for dilution. Skin Perfection's 10% serum can be used as a base for serum boosters. Adding boosters dilutes the niacinamide slightly, so starting at 10% keeps the final mix near the top of the supplier range even after boosters are added.
- Single-step simplicity. A serum is a thin layer. Many people apply 3 to 4 drops, and the amount that stays on skin is small. A higher starting concentration is a common formulator choice for leave-on serums.
- Tolerance. Niacinamide is generally well tolerated, and the CIR Expert Panel concluded in 2005 that niacinamide is safe as used in cosmetics. That review covered products up to 3%, so it does not specifically address 10%. Anyone with reactive skin should patch test first, as explained in the how-to guide linked above.
What we will not claim: there is no published controlled trial we could verify showing that 10% gives better visible results than 5%. If you see a brand say 10% is "twice as effective" as 5%, ask for the study.
What Is in Skin Perfection's 10% Niacinamide Serum
Our 10% Niacinamide Serum is a short, transparent formula. Here is what each ingredient does from a formulator's point of view.
| Ingredient | Role in the formula |
|---|---|
| Niacinamide (10%) | Primary active, water phase |
| Water and aloe leaf juice | Base and conditioning feel |
| Glycerin and sodium hyaluronate | Humectants that pull water toward the skin surface |
| Zinc PCA | Oil-balancing support often paired with niacinamide |
| Vitamin E | Antioxidant for the formula |
| Phenoxyethanol | Preservative that keeps a water-based product free from microbial contamination |
The serum is paraben free and vegan. If you want extra hydration, our Hyaluronic Acid Plumping Serum layers well with it, and formulators who build their own bases can use Sodium Hyaluronate Powder.
Niacinamide Stability: What Formulators Watch
Niacinamide is one of the more forgiving actives in a cosmetic lab, but it has limits.
- pH. DSM, a major niacinamide supplier, recommends a final formula pH of 4.0 to 8.0. DSM lists the pH of a niacinamide solution itself at about 6.0 to 7.5.
- Hydrolysis. DSM lists strong acids, strong bases and oxidizing agents as incompatible because they can hydrolyze niacinamide to nicotinic acid, the form associated with flushing. It also warns against enzyme-containing ingredients (amidases) for the same reason.
- Heat. The same guidelines allow processing cold or hot up to 70°C (158°F), added to the water phase.
- Pairing with low-pH products. Because the recommended window starts at pH 4.0, very acidic products such as low-pH L-ascorbic acid serums are better kept in a separate bottle rather than combined with niacinamide in one formula.
- Storage. Cap tightly, keep out of direct sun, and use within the period on the open-jar symbol.
If you are adding a booster to the serum, our house rule is 9 drops per 1% per fluid ounce. Use each booster at the highest rate its manufacturer recommends. For example, Argireline at its 10% maximum is 90 drops in 1 oz of serum, and Matrixyl 3000 at 8% is 72 drops.
For how niacinamide compares with peptides and how the two pair in one routine, see Niacinamide vs Peptides: How They Compare and Pair.
What the Research Does Not Show
- Most trials ran 4 to 12 weeks. We found no long-term controlled cosmetic trials beyond that.
- Several studies were in one population (for example, white women, or Japanese adults). Results may differ across skin types and tones.
- Lab data on ceramides and pigment transfer explain a likely mechanism. They are not a measured result on human skin.
Frequently Asked Questions
Is niacinamide the same as niacin?
No. Both are forms of vitamin B3, but niacinamide is the amide form and niacin is nicotinic acid. Niacin is known for causing a warm red flush; niacinamide is reported not to. On a label, look for "niacinamide" in the INCI list.
Is 10% niacinamide stronger than 5%?
It contains twice as much niacinamide, but we could not find a controlled study showing twice the visible result. Most published trials used 2% to 5%. A 10% serum is a formulation choice that leaves room for dilution with boosters.
How long did people use niacinamide in the studies before changes were measured?
Measured changes were reported at 2 to 4 weeks for surface oil, 4 weeks for uneven tone, 8 weeks for texture and wrinkle grades, and 12 weeks for the broader appearance-of-aging study.
Why should niacinamide and low-pH vitamin C be kept in separate products?
Supplier guidelines place niacinamide in a final formula pH of 4.0 to 8.0 and list strong acids as incompatible. Very low-pH vitamin C serums sit below that window. Keeping them in separate products, used at different times of day, lets each stay in its own range.
Does niacinamide work like a tyrosinase inhibitor?
Lab work by Hakozaki and colleagues found it did not inhibit tyrosinase or melanin production. Instead it reduced the transfer of pigment from pigment cells to surface skin cells, a different step in the process.
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.
About the Author
Written by Kari Thomas, cosmetic formulator and founder of Skin Perfection.
Sources
- Bissett DL, et al. Niacinamide: a B vitamin that improves aging facial skin appearance. Dermatologic Surgery. 2005;31(7 Pt 2):860-865. PubMed 16029679
- Hakozaki T, Minwalla L, Zhuang J, et al. The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer. British Journal of Dermatology. 2002;147(1):20-31. Journal page
- Draelos ZD, Matsubara A, Smiles K. The effect of 2% niacinamide on facial sebum production. Journal of Cosmetic and Laser Therapy. 2006;8(2):96-101. PubMed 16766489
- Boo YC. Mechanistic basis and clinical evidence for the applications of nicotinamide (niacinamide) to control skin aging and pigmentation. Antioxidants. 2021;10(8):1315. PMC8389214
- DSM Nutritional Products. Niacinamide PC formulation guidelines. September 2023. Supplier technical document
- Cosmetic Ingredient Review Expert Panel. Final report of the safety assessment of niacinamide and niacin. International Journal of Toxicology. 2005;24(Suppl 5):1-31. DOI 10.1080/10915810500434183