Short answer: niacinamide (vitamin B3) is one of the better-studied actives in skincare — it supports the skin barrier, calms the look of redness, and can refine the visible size of pores. Most of the evidence sits between 2% and 5%; higher percentages don't reliably do more and can increase the odds of tingling or flushing, especially on reactive skin.

By the LAVOÙE team · Last updated 2026-09-22. General information, not medical or dermatological advice.

What niacinamide actually does

Niacinamide is the active form of vitamin B3 used topically. In skin, it's a precursor for two coenzymes (NAD and NADP) that cells use for basic energy metabolism and repair. In practical terms, that translates into a few well-documented effects:

  • Barrier support. Niacinamide helps skin cells produce more ceramides and fatty acids — the "mortar" that holds the barrier together — which is linked to lower transepidermal water loss (skin holding onto moisture better).
  • Calmer-looking redness. It has a mild anti-inflammatory action, which is why it's a common first step for reactive or redness-prone skin.
  • Refined pore appearance. By helping regulate sebum production, niacinamide is associated with visibly smaller-looking pores over consistent use — not a permanent change to pore size, which isn't possible topically, but a visible one.

Why the percentage matters more than the ingredient list

"Contains niacinamide" tells you nothing about dose. Most of the published evidence for visible redness and barrier benefits clusters in the 2–5% range. Above roughly 5%, and especially near or above 10%, more people report tingling, flushing, or irritation without a clear added benefit — the dose-response curve flattens out well before you get anywhere close to niacinamide's theoretical maximum solubility.

We hold Niacinamide Barrier Drops at 3% niacinamide, specifically because it sits inside the range with the strongest evidence while staying comfortable for skin that's already reactive — the exact audience the product is formulated for.

The niacinamide + vitamin C myth

You'll still see warnings that niacinamide and vitamin C "cancel each other out" or turn into niacin (which causes flushing) when combined. This traces back to older, high-heat lab conditions that don't reflect how a modern serum is formulated or how it sits on skin at room temperature. Most current formulation guidance treats the interaction as a non-issue at normal use concentrations and pH. If you're layering niacinamide with a vitamin C step, the practical reason to separate them isn't chemistry — it's that vitamin C is a morning, pre-SPF step, while niacinamide can go morning or evening.

Who benefits most

  • Redness-prone or reactive skin looking for a calming daily step
  • Skin with visibly enlarged-looking pores
  • Anyone easing into actives for the first time — niacinamide is generally one of the better-tolerated starting points

Who should be careful

Niacinamide is well-tolerated for most people, but very high concentrations (well above what's typically sold, and well above our 3%) have been associated with flushing in some users. If you notice persistent stinging, redness, or breakouts that don't settle within the first week or two, discontinue and consult a dermatologist — as with any new active, patch test first.

Frequently asked questions

What percentage of niacinamide is actually effective? Most of the evidence for visible benefit sits between 2% and 5%. Higher isn't necessarily better.

Can I use niacinamide every day? Yes — it's one of the better-tolerated actives for daily use, morning or evening.

Does niacinamide help with acne? Its sebum-regulating and anti-inflammatory effects are associated with a calmer-looking complexion, but it isn't a substitute for a dedicated acne treatment if you have persistent breakouts — talk to a dermatologist for that.

Can I use niacinamide with PDRN or peptides? Yes, they're commonly layered. Apply lighter, water-based serums first and introduce one new active at a time so you can tell what your skin likes.

Sources

  • Bissett D.L. et al., "Niacinamide: A B Vitamin that Improves Aging Facial Skin Appearance," Dermatologic Surgery: barrier and appearance effects.
  • Gehring W., "Nicotinic acid/niacinamide and the skin," Journal of Cosmetic Dermatology: mechanism review.
  • Wohlrab J. and Kreft D., "Niacinamide — mechanisms of actions and its topical use in dermatology," Skin Pharmacology and Physiology: dose-response discussion.

Product mentioned: Niacinamide Barrier Drops, 3% niacinamide.