Niacinamide for dark spots: does it help?

Niacinamide is a form of vitamin B3, and it appears in many serums and moisturizers sold for dark spots. The research on it is real but limited. This guide covers how niacinamide works on pigment, what the trials found, the strengths they used, and where the evidence stops. It is part of Skinli's guide to hyperpigmentation.

How niacinamide works on pigment

Most ingredients that fade dark spots, such as vitamin C and azelaic acid, block tyrosinase, the enzyme skin needs to make melanin. Niacinamide works at a later step.

Melanin is made inside pigment cells called melanocytes, packed into small bundles, and then passed to the skin cells around them. A 2002 study in the British Journal of Dermatology found that niacinamide left tyrosinase and melanin production unchanged in lab tests, and reduced the transfer of pigment bundles to the surrounding skin cells, by 35% to 68% in a lab model. The authors concluded it lightens skin by slowing this transfer.

A 2010 review in the Journal of Clinical and Aesthetic Dermatology describes the same action, and adds that niacinamide stays stable when exposed to light, moisture, acids and other conditions that break down vitamin C.

What the trials found

Study	Who	What was used	Result
2002, British Journal of Dermatology	18 Japanese women with facial dark spots	5% niacinamide moisturizer and a plain moisturizer, compared in a paired design	Fewer dark spots and lighter skin than the plain moisturizer after 4 weeks
Same 2002 study	120 people with facial tanning	Two of three treatments: plain cream, sunscreen, or 2% niacinamide with sunscreen	Niacinamide lightened skin compared with the plain cream
2011, Dermatology Research and Practice	27 people with melasma, in a trial run in Mexico	4% niacinamide on one side of the face, 4% hydroquinone on the other, 8 weeks, with sunscreen	Good to excellent improvement in 44% with niacinamide and 55% with hydroquinone. Side effects in 18% and 29%

In the 2011 trial, skin color measurements found no statistical difference between the two sides, and all patients improved with both creams. The authors called niacinamide safe and effective for melasma.

Where the evidence stops

Two gaps matter for readers of a site about acne.

• Acne marks on darker skin. The 2010 review says the safety and effect of niacinamide for marks left after inflammation in darker-skinned people have not been studied. The trials above were on melasma, tanning and facial spots in Japanese and Mexican patients.
• The AAD list. The American Academy of Dermatology (AAD) lists five ingredients that can fade dark spots without a prescription: azelaic acid, glycolic acid, kojic acid, retinoids and vitamin C. Niacinamide is not one of them.

One more point about the 2002 study: its authors worked in research and development at Procter & Gamble, a company that sells skin care products, per the study's author information. That is worth knowing when weighing a single study.

How to read these trial results

Three terms in the table above explain how much each result can tell you.

• A plain cream or "vehicle". This is the same cream without the active ingredient. Comparing against it shows whether the ingredient did anything beyond moisturizing.
• Double-blind. Neither the patients nor the researchers knew which cream was which while the study ran. The 2011 melasma trial was double-blind, which makes its ratings harder to bias.
• Paired or split-face design. Each person uses one cream on one side and the other cream on the other side, or both in a paired way. This removes differences between people, but it keeps the groups small.

All three trials above had fewer than 150 people, and the two treatment trials on spots had 18 and 27. Small trials can show that an ingredient does something. They cannot show how well it works for most people, or for groups the trials did not include.

Strengths used in studies

The trials used 2%, 4% and 5% niacinamide. The 2010 review describes 2% to 5% as the range that has shown some effect, used alone or combined with N-acetyl glucosamine, another ingredient studied for lightening. No medical guideline sets a dose of niacinamide for dark spots, and Skinli's plan does not include it.

The trials above did not test strengths higher than 5%, so there is no trial evidence that a higher percentage fades spots faster.

How long it takes

The 2002 study measured a change after 4 weeks, using computer analysis of high-resolution face photos. The 2011 melasma trial lasted eight weeks. Changes measured this way may be hard to see in a mirror. For comparison, the AAD says a flat mark a few shades darker than your skin usually fades within 6 to 12 months once its cause stops. Plan for months, and compare monthly photos in the same light.

When niacinamide makes sense

Niacinamide may suit you if:

• You have melasma or sun-related spots and want a gentle cream alongside sunscreen, ideally as part of a plan from a dermatologist.
• Stronger ingredients such as retinoids irritate your skin.
• You want an ingredient that stays stable in the bottle.

It is a weaker choice if:

• Your main problem is marks left by acne. The AAD says a retinoid applied to the skin can help lighten dark spots after acne clears, and that azelaic acid treats both acne and its marks. See azelaic acid for dark spots and retinol and tretinoin for dark spots.
• You have darker skin and acne marks, since that use has not been studied.

Niacinamide compared with other fading ingredients

Ingredient	How it works on pigment	On the AAD list?	Also treats acne?
Niacinamide	Slows the transfer of pigment to skin cells	No	Not covered by the sources read here
Vitamin C	Blocks tyrosinase	Yes	No
Azelaic acid	Blocks tyrosinase and acts on overactive pigment cells	Yes	Yes
Retinoids	Speed up turnover of surface skin cells	Yes	Yes

Because niacinamide works at a different step from vitamin C, the 2010 review says combinations with other lightening ingredients have been studied, such as niacinamide with N-acetyl glucosamine. The vitamin C page covers the ingredient many people use next to it.

Checking a product before you buy

Skinli names no brands, so use the label.

• Find the ingredient. Niacinamide appears in the ingredient list. Some products also show the percentage on the front.
• Avoid illegal lighteners. The FDA says no skin lightening product is legally sold over the counter in the US. A dark spot product that lists hydroquinone and is sold without a prescription is breaking that rule.
• Be careful with imports. The AAD says researchers have found steroids or mercury, missing from the label, in skin care products imported from other countries. It suggests products made in the United States or recommended by a dermatologist.

How to use it

1. Sunscreen first. Every trial above paired niacinamide with sunscreen or compared it against sunscreen. The AAD says effective treatment for dark spots begins with sunscreen, and recommends a tinted one with iron oxide and SPF 30 or higher.
2. Follow the label. Apply it as the product directs, on clean skin.
3. Patch test first. Try it on a small area for several days. The guide on how to patch test a new skincare product gives the steps.
4. Add one product at a time. If your skin reacts, you will know which product caused it.
5. Stop if it burns or stings. The AAD says irritation can darken dark spots, especially on darker skin.

Niacinamide and melasma treatment

The AAD's melasma page does not list niacinamide among the medicines dermatologists commonly prescribe. It names hydroquinone, tretinoin with a mild steroid, a triple cream, and gentler options such as azelaic acid, kojic acid and vitamin C. The 2011 trial suggests niacinamide may be another gentle option, but one trial of 27 people is a small amount of evidence. If melasma has not improved after three to six months of a non-prescription product, the AAD advises seeing a dermatologist. The melasma page has the full plan.

Summary of the evidence

Niacinamide has a clear way of working and small trials that show modest lightening, mostly for melasma and sun-related spots. It has not been tested for acne marks on darker skin, and it is not on the AAD's list. It can play a supporting part, and sunscreen comes first. For the full set of steps, read how to get rid of dark spots on your face.