Niacinamide vs niacin: Which is better for skin?

Is niacinamide the same as niacin?

Not exactly. Niacin sometimes means vitamin B3 broadly, which includes both nicotinic acid and niacinamide. In comparisons and medicine names, niacin usually means nicotinic acid. Niacinamide and nicotinamide are two names for the same substance. The naming gives one vitamin several aliases, which is more administrative work than a skincare ingredient needs. Your body converts dietary niacin into niacinamide, but that does not make the two forms identical in their effects.13

Which should you choose for skincare?

Choose topical niacinamide for hydration, oiliness, uneven tone or fine lines. It can reduce water loss through the outer skin layer and improve the skin barrier, which helps keep moisture in and irritants out. Niacinamide is generally well tolerated, including by some people who cannot tolerate topical retinoids or fruit acids. Clinical trials support improvements in pigmentation and signs of skin aging, although exactly how niacinamide produces every effect remains uncertain.25

How do you use niacinamide?

Niacinamide appears in cleansers, moisturizers and sunscreens, so vitamin B3 does not require its own shelf.6

1. 1Choose a low concentration and start slowly if your skin is sensitive. Most skincare products contain 5% niacinamide or less.
2. 2Patch test a small amount on your forearm and wait 24 hours before broader use.
3. 3Use niacinamide after gentle cleansing, once or twice daily. It can fit into a morning or evening routine.
4. 4For a separate niacinamide product, applying it after moisturizer is one option. A niacinamide serum can also be combined with moisturizer.
5. 5Avoid using too many niacinamide products at once. Niacinamide can be paired with vitamin C, ceramides, hyaluronic acid or retinol.

How long do skin benefits take?

Think in weeks, not applications. A 2% niacinamide moisturizer reduced facial oil production after four to six weeks in a clinical trial. Studies of 4% to 5% formulas reported improvements in wrinkles and other signs of aging over eight to twelve weeks. Those are useful assessment windows, not a deadline for every formula. Niacinamide does not prevent sunburn or replace sunscreen.5

Who should be careful?

Topical niacinamide can occasionally cause itching, redness, mild burning or an allergic reaction. Stop using a product that causes these symptoms. If a niacinamide acne gel causes excessive dryness with twice daily use, reduce application to once daily or every other day.56

Do not start high dose niacin supplements for skincare. Most people get enough vitamin B3 from food, and high doses can cause liver problems, high blood sugar and low blood pressure. Oral nicotinamide also has potential side effects. If you take prescribed niacin, discuss other medicines and supplements with your doctor, and do not switch brands or tablet types yourself. Tell your doctor if you are pregnant, planning pregnancy or breastfeeding; if you become pregnant while taking niacin, stop it and call your doctor. Seek immediate medical help for breathing difficulty, swelling, faintness or yellowing of the skin or eyes.345