Niacinamide Gel, Honestly: What 5% Does, Who a Gel Suits — and What Is in Ours

Niacinamide is the rare skincare ingredient that is both fashionable and well studied. It is also sold in a confusing range of strengths and textures — 2% to 20%, in serums, creams, toners and gels — with very little explanation of what the differences mean.

This is the honest version for one format in particular: the niacinamide gel. What niacinamide has been shown to do and at what strength, who a gel texture actually suits, and — because we sell one — exactly what is in ours, including the part we would rather you read here than discover on your face. If you only want the routine, skip to how to use it.

What niacinamide is — and what makes a gel different

Niacinamide — also written nicotinamide — is a water-soluble form of vitamin B3. Skin cells use it to make NAD+, a coenzyme involved in energy production and repair. Unlike niacin (nicotinic acid), the other common form of vitamin B3, it is not known for causing skin flushing.

Because it dissolves in water, niacinamide does not need oils to carry it. That is what makes the gel format possible: water, a humectant such as glycerin, a plant- or seaweed-derived gelling agent, and the active. No oils, no waxes, nothing left sitting on the surface. The niacinamide is the same molecule whether it arrives in a gel, a serum or a cream — the texture changes how it feels and who will enjoy using it, not what it does.

One distinction worth making, because the two share a name: in some countries, pharmacies sell a 4% nicotinamide gel as a medicine for acne. A cosmetic niacinamide gel moisturiser — including ours — is a different thing. It is a moisturiser, regulated as a cosmetic, and it is not a treatment for acne or any other skin condition.

What niacinamide has actually been shown to do

Uneven tone and dark spots

This is where the evidence is most direct. A 2002 study in the British Journal of Dermatology compared a 5% niacinamide moisturiser with the identical moisturiser minus the niacinamide, in 18 Japanese women with hyperpigmentation. After four weeks, niacinamide had significantly decreased hyperpigmentation and increased skin lightness compared with the plain moisturiser.

The same paper explains how. Niacinamide did not inhibit tyrosinase, the enzyme that makes melanin — the route many brightening ingredients take. Instead, in laboratory skin models it reduced the transfer of pigment from the cells that make it to the surrounding skin cells, by 35–68%. That matters practically: niacinamide works by a different route from kojic acid or alpha-arbutin, so pairing it with one of them is a reasonable combination rather than a duplication.

Fine lines, texture and sallowness

In a 2005 randomised, double-blind trial, 50 women with signs of facial photoageing applied 5% niacinamide to one half of the face and the identical cream without it to the other half, twice a day for twelve weeks. The niacinamide side showed significant reductions in fine lines and wrinkles, hyperpigmented spots, red blotchiness and sallowness, and improved elasticity on instrument measurement.

Oil and shine

Here the evidence is real, but more mixed than the marketing suggests. A 2006 paper reported two trials of a 2% niacinamide moisturiser. In the first, 100 people in Japan used either the niacinamide moisturiser or a placebo; the niacinamide group had a significantly lower sebum excretion rate after two and four weeks. In the second, a six-week split-face study of 30 people in the United States, the amount of oil sitting on the skin surface fell significantly — but the rate at which skin produced it did not.

A fair summary: niacinamide can reduce how oily skin looks and measures, the effect is modest, and it did not show up the same way in every group tested. It will not turn oily skin into dry skin.

The skin barrier

A 2000 study found that niacinamide increased the production of ceramides — the lipids that hold the skin barrier together — in cultured skin cells by four- to five-fold, along with free fatty acids and cholesterol. Applied to dry skin, it raised ceramide and fatty acid levels in the outer layer and reduced water loss through the skin. It is the least glamorous finding and arguably the most useful: a better barrier is what makes every other active easier to tolerate.

Who ran the studies — and why that matters

Now the part most articles leave out. Both 5% trials above came from the research laboratories of Procter & Gamble, which sells niacinamide moisturisers. The barrier study came from Kanebo, a Japanese cosmetics company. That does not make the work wrong — these are controlled, peer-reviewed studies in respected journals — but it is a reason to want confirmation from someone with nothing to sell.

That exists. A 2021 review from a university medical school, declaring no conflicts of interest, went through the accumulated evidence and concluded that topical niacinamide reduces the progression of skin ageing and hyperpigmentation in clinical trials, and is well tolerated. The same review adds a note of humility worth repeating: there is still no convincing evidence of a single specific molecular target. Niacinamide appears to work by supporting the cell’s general energy and repair systems rather than by flipping one switch.

Industry-funded does not mean wrong. It means you should want a second opinion — and with niacinamide, there is one.

Is 10% niacinamide better than 5%?

Niacinamide serums are now routinely sold at 10%, and some at 20%. It is reasonable to assume that more is better. We have not found a published trial showing that it is: the controlled studies behind niacinamide’s reputation used 2% to 5%, and we are not aware of a head-to-head comparison in which 10% out-performed 5%.

The tolerance data points the same way. The Cosmetic Ingredient Review’s safety assessment reported no irritation in use tests at up to 5%, no stinging at up to 10%, and found niacinamide to be neither a sensitiser nor a photosensitiser. Above that, the published record simply thins out. If a high-strength niacinamide product has left your skin red or itchy, dropping to 5% is a more logical next step than giving up on the ingredient.

Gel, serum or cream: which niacinamide format suits you?

What is in our niacinamide gel — and who it does not suit

Our Niacinamide Gel Moisturiser has thirteen ingredients, and this is all of them in plain language: water; alcohol; 5% niacinamide; glycerin, a humectant; cellulose gum and algin (from seaweed), which form the gel; organic ginkgo leaf extract; a light fragrance; and the pH adjusters, stabiliser and preservatives that keep a water-based formula safe to use. There are no oils, silicones or waxes. It is vegan, and it sits at the strength the trials used.

Now the honest part. Alcohol is the second ingredient, listed ahead of the niacinamide — which means the formula contains at least as much alcohol as it does niacinamide. It is there for a reason: it is what lets the gel spread thin and dry down in seconds with nothing left on the surface, which is exactly what oily skin wants under sunscreen. But alcohol at that level can feel drying or stingy on skin that is already dry, tight or reactive. If that describes you, this is not your moisturiser, and we would rather tell you than sell it to you.

• Reactive skin: the Sensitive Skin Moisturiser, Fragrance Free — no fragrance and no ethanol. It does not contain niacinamide.
• Dry skin: the Ceramide Barrier Night Cream in the evening. Also no niacinamide; it supplies barrier lipids directly instead.
• You like a gel but not alcohol: the Double Hydration Boost Gel + HA is an alcohol-free aloe and hyaluronic acid gel. No niacinamide, but the same weightless finish.
• Fragrance is your trigger: the niacinamide gel is lightly fragranced. None of the fragrance allergens that EU rules require to be declared appear on its ingredient list, but fragranced is not fragrance free — patch-test on the inner arm for a couple of days first.

How to use a niacinamide gel

1. Cleanse with a gentle cleanser — one that does not leave your face feeling tight.
2. Water-based serum first, if you use one: vitamin C in the morning, for example.
3. Niacinamide gel on clean, dry skin — a thin, even layer over the whole face, morning and evening. The 12-week trial applied niacinamide twice a day from the start; there is no build-up period.
4. Dry patches? Layer a cream over the top where you need it. A gel is a light moisturiser, not a rich one.
5. SPF every morning. Niacinamide is not a photosensitiser, so this is not about the gel — it is that UV exposure drives the dark spots you are trying to fade. The NHS advises at least SPF 30; ours is a tinted SPF50 stick.

What niacinamide layers well with

• Vitamin C. Yes, together. The old warning that the two cancel each other out concerns pure ascorbic acid reacting with niacinamide in solution over time — not two finished products meeting briefly on skin. Our Vitamin C Serum uses ascorbyl glucoside, a stabilised form, which makes it even less of a concern. Serum first, gel on top.
• Alpha-arbutin and kojic acid. These act on melanin production; niacinamide acts on pigment transfer. The Pigment Perfecting Serum (alpha-arbutin) goes under the gel, or the Dark Spot Face Cream with Kojic Acid can take the moisturiser step in the evening.
• Exfoliating acids. Fine in the same routine — just not introduced in the same fortnight. Add the Glycolic Acid Exfoliating Toner a few evenings a week once your skin has settled on the gel.
• Peptides and retinol alternatives. No known conflicts. We went through the evidence for both: peptides and retinol alternatives.

One rule covers all of it: introduce one new active at a time, two weeks apart. If your skin reacts, you will know to what.

A realistic timeline

• Day one: Skin feels hydrated, with a matte, weightless finish. That is the glycerin and the gel texture — real, but not the niacinamide at work yet.
• Weeks 2–4: The window in which the trials measured less oil and, at 5%, the first significant change in dark spots.
• Weeks 8–12: Fine lines, blotchiness and overall tone. Twelve weeks is where the longest trial ended; judge it then, not before.
• Beyond: Maintenance. Pigment returns with sun exposure, which is why the sunscreen matters more than the gel.

Where to start

If your skin is oily or combination and you want one product to do the work of a serum and a moisturiser, the Niacinamide Gel Moisturiser is 5% niacinamide — the strength the trials used — in a gel that disappears under sunscreen. Use it twice a day for twelve weeks, with SPF every morning. For dark spots specifically, pair it with the rest of the brightening and dark spot edit; for a lighter routine all round, see skincare for oily and blemish-prone skin or browse all moisturisers.

And if your skin is dry, tight or easily upset, skip this one. Niacinamide is a genuinely good ingredient; an alcohol-based gel is simply the wrong vehicle for you. The right product is the one you will still be comfortable using in week twelve.