Niacinamide in Skincare: What Vitamin B3 Has Been Shown to Do, Which Concentration Makes Sense and How to Get Started

Niacinamide is the amide form of vitamin B3 and one of the best-studied actives in skincare: in studies with 2 to 5%, it reduces sebum production, makes dark spots and redness look paler and strengthens the skin barrier by stimulating the formation of ceramides. It is well tolerated, can be combined with almost anything and suits every skin type. This guide explains what is proven, which concentration makes sense, which myths you can forget and how to get started.

What is niacinamide?

Niacinamide (INCI: Niacinamide, also nicotinamide) is a water-soluble form of vitamin B3. In the body it is a building block of the coenzymes NAD and NADP, which are involved in energy production and repair processes in every skin cell. Applied to the skin, it penetrates the epidermis well and acts there at several points at once: on the sebaceous glands, on the pigment-producing cells and on the lipid synthesis of the stratum corneum. It is precisely this versatility that makes it a standard addition to toners, serums, creams and even sunscreens in Korean skincare.

Niacinamide should not be confused with nicotinic acid (niacin), the second form of vitamin B3. Nicotinic acid dilates the blood vessels and triggers the well-known feeling of heat with redness ("flush"); niacinamide does not.

Which effects are proven?

• Less sebum and shine: in two studies with 2% niacinamide, sebum excretion in 100 Japanese participants fell measurably after two and four weeks; in 30 participants in the USA, the amount of sebum on the skin surface decreased after six weeks (Draelos et al., 2006).
• Paler dark spots: niacinamide inhibits the transfer of pigment packages (melanosomes) from the pigment-producing cells to the skin cells. A 5% moisturiser made dark spots visibly paler in 18 women after four weeks (Hakozaki et al., 2002).
• More even, firmer-looking skin: 5% niacinamide twice a day for twelve weeks reduced fine lines, dark spots, blotchy redness and a dull yellowish tone in 50 women and improved elasticity (Bissett et al., 2005).
• Stronger skin barrier: niacinamide stimulates skin cells to produce more ceramides, free fatty acids and cholesterol. On dry skin, the ceramide content of the stratum corneum rose and water loss through the skin fell (Tanno et al., 2000).
• Pores: the evidence is thinner here. Less sebum and a smoother stratum corneum make pores look smaller; they do not actually shrink.

All the studies mentioned are in the range of 2 to 5%. This range is the reason why dermatologists and reviews (Wohlrab and Kreft, 2014; Forbat et al., 2017) classify niacinamide as a well-documented cosmetic active.

Which concentration makes sense?

The rule of thumb: a higher percentage brings no proven added value but increases the risk of the skin reacting with redness or tingling. If you want to tackle dark spots, 5% niacinamide plus tranexamic acid or arbutin and daily sunscreen achieves more than 15% niacinamide alone. You will find products for this in the dark spots collection.

Which myths about niacinamide are not true?

• "Niacinamide and vitamin C do not go together." The myth comes from laboratory experiments in which both substances reacted over a long period at high temperature. In finished products at room temperature this does not happen; many Korean vitamin C serums contain niacinamide in the same formula, for example the Dr. Althea vitamin C serums. If you use both separately, you can apply them directly one after the other.
• "Niacinamide makes you red." The feeling of heat with redness is caused by nicotinic acid, not niacinamide. If the skin reacts to a high-dose product with redness, it is usually due to the concentration or other ingredients; a 2 to 5% product is then the better choice.
• "Niacinamide shrinks pores." Pores have no muscles that could contract. They look smaller when less sebum sits in them and the skin around them is smooth and well hydrated. That is exactly what niacinamide can do, nothing more.
• "More is better." The studies on which niacinamide's reputation rests work with 2 to 5%. For 10 to 20% there are no comparative studies showing a stronger effect.

How well tolerated is niacinamide?

In clinical studies, niacinamide at 2 to 5% was described as well tolerated, even with twelve weeks of daily use. It does not make the skin sensitive to light, does not dry it out and is unproblematic during pregnancy. Two things are still worth noting: with very sensitive skin or an irritated barrier, a high-dose serum can tingle; a lower-dose product or a cream with niacinamide instead of a serum helps. And if you layer several products with niacinamide at the same time (toner, serum, cream, sunscreen), you quickly reach double-digit totals; one or two products containing niacinamide per routine are enough.

What can niacinamide be combined with?

• Retinol: the classic combination. Niacinamide strengthens the barrier and makes retinol easier to tolerate; both in the evening, niacinamide first or in the cream.
• BHA, AHA, PHA: unproblematic. Apply niacinamide after the acid toner or the pads; that way it soothes the skin and regulates sebum.
• Tranexamic acid, arbutin, vitamin C derivatives: for dark spots and glow. Ready-made combinations are more practical than three separate serums.
• Hyaluronic acid, ceramides, panthenol, centella, heartleaf: hydration and soothing, ideal for dry and sensitive skin. The Anua Peach Niacinamide Cream combines niacinamide with ceramides and panthenol. How centella and heartleaf work is explained in the centella guide and the heartleaf guide.

How do you get started?

1. Choose a product with 2 to 5%: a serum if pores, shine or dark spots are your main concern; a cream with niacinamide if your skin is more on the dry and sensitive side.
2. For the first week, apply once a day in the evening after the toner, then morning and evening.
3. Do not forget sunscreen in the morning. Without it, the effect on dark spots fizzles out, because UV light restarts pigment formation every day.
4. Patience: less shine shows after two to four weeks, a more even complexion after four to twelve weeks.
5. Only then, if necessary, switch to 10% with tranexamic acid if dark spots remain the main issue.

Where the serum sits in the order is explained in the routine guide; the Routine Builder puts together a complete routine with a suitable niacinamide product for you. You will find all products with this active in the niacinamide collection, and care for visible pores in the pores collection.

Which skin is niacinamide suitable for?

• Oily and combination skin: the core audience because of sebum regulation; light serums or essence toners such as the Anua Peach 77 Niacin Essence Toner.
• Blemish-prone skin: less sebum and redness around blemishes, especially in combination with BHA.
• Skin with dark spots and a dull complexion: 5% or combinations with tranexamic acid, always with sunscreen.
• Dry, sensitive skin: useful because of ceramide formation, but in a low dose and ideally in a cream.
• Mature skin: for elasticity, fine lines and an even tone, ideally with retinol or peptides.