The Lab · 5 min read

Niacinamide for the scalp

Q: Is niacinamide safe to use daily on the scalp?

Niacinamide has one of the cleanest tolerance profiles in dermatology, including in leave-on daily-use products. Patch test if you have a sensitive scalp and discontinue if irritation occurs.

Q: Can I use niacinamide if I already use it on my face?

Yes. The scalp is contiguous with facial skin, and many people who already use niacinamide on their face extend it naturally to scalp skincare.

Q: Does niacinamide make hair grow?

No ingredient on its own makes hair grow — that is a structure-function claim reserved for regulated drugs. Niacinamide has been studied for supporting the dermal papilla and scalp barrier at the cellular level.

Niacinamide for the scalp: how vitamin B3 supports the scalp barrier, what peer-reviewed research shows, and why we include it in Scalp Milk. Cosmetic ingredient research from the ooedn lab.

By ooedn lab · June 27, 2026 · ingredient research

the lab · ingredient deep-dive

niacinamide for the scalp.

Niacinamide is a form of vitamin B3 (3-pyridinecarboxamide) with three decades of dermatology research behind it as a barrier-support ingredient. In topical scalp formulations, niacinamide is studied for supporting the scalp barrier, modulating oxidative stress at the cellular level, and downregulating signaling molecules such as DKK-1 that are associated with the catagen phase of the hair cycle. Used cosmetically on the scalp, niacinamide is a low-irritation, well-tolerated workhorse — one of the most-studied actives in all of skincare, now extended to the skin where hair grows.

vitamin B33-pyridinecarboxamide

2–5%typical topical range

30+ yearsdermatology research

ingredient research — not a claim about ooedn.

the mechanism

Niacinamide is a precursor to NAD+ and NADP+ — coenzymes that drive cellular energy and redox balance. Topically, it has been documented to support epidermal barrier function by increasing the synthesis of ceramides and free fatty acids, the lipids that hold corneocytes together in the stratum corneum. That barrier-support work is well-established in the skincare literature and transfers directly to the scalp, which is contiguous facial skin.

On the scalp specifically, niacinamide has been studied for protecting dermal papilla cells (the signaling cells at the base of the hair follicle) from hydrogen-peroxide-induced oxidative stress, and for downregulating DKK-1 — a Wnt-pathway inhibitor associated with the transition out of the growth phase of the hair cycle (PMC8536842).

For cosmetic formulators, niacinamide is also valued for what it doesn't do: it is photostable, pH-tolerant across a wide range, layers well with most other actives including vitamin C and retinoids, and has an unusually clean irritation profile compared to other barrier ingredients.

in scalp milk

We include niacinamide in Scalp Milk as a barrier and antioxidant anchor alongside hyaluronic acid, panthenol, and glycerin on the hydration side, and resveratrol, caffeine, melatonin, coenzyme Q10 and EGCG on the antioxidant complex side. It's chosen for its track record across decades of dermatology research and its compatibility with daily, all-skin-types use.

the research

Niacinamide protects human dermal papilla cells from hydrogen peroxide-induced oxidative stress Journal of Dermatological Science / Annals of Dermatology · 2021 · PMC8536842
Niacinamide: a B vitamin that improves aging facial skin appearance Dermatologic Surgery · 2005 · Bissett DL, Oblong JE, Berge CA
Topical niacinamide reduces skin sallowness, hyperpigmentation, and red blotchiness, and improves barrier function International Journal of Cosmetic Science · 2004 · Hakozaki T et al.
Mechanism of action of niacinamide on the skin barrier: ceramide synthesis and stratum corneum lipids British Journal of Dermatology · 2000 · Tanno O, Ota Y, Kitamura N et al.

faq

what does niacinamide do for the scalp?

Niacinamide is a vitamin-B3 derivative studied for supporting the scalp barrier and for protecting cells at the base of the hair follicle from oxidative stress. It is one of the most-researched ingredients in skincare and translates directly to scalp care, since the scalp is contiguous facial skin.

is niacinamide safe to use daily on the scalp?

Yes — niacinamide has one of the cleanest tolerance profiles in dermatology, including in leave-on daily-use products. It is pH-tolerant, photostable, and compatible with most other actives. As with anything new, patch test if you have a sensitive scalp and discontinue if irritation occurs.

can I use niacinamide if I already use it on my face?

Yes. Niacinamide is non-cumulative in the sense that applying it to multiple areas does not produce additive irritation, and the scalp is contiguous with facial skin. Many people who already use niacinamide on their face find it a natural extension to scalp skincare.

does niacinamide make hair grow?

No ingredient on its own "makes hair grow" — that is a structure-function claim reserved for regulated drugs. Niacinamide has been studied at the cellular level for supporting the dermal papilla and the scalp barrier; we describe what the research shows and stop there.

reviewed by ooedn lab · last reviewed 2026-06-22

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Scalp Milk is a cosmetic leave-on mist. Not intended to diagnose, treat, cure, or prevent any disease.

Ingredient research summarized on this page describes the molecule, not the product. Cited studies are linked to peer-reviewed sources.