What Is Niacinamide? — The Complete Guide
Niacinamide is a form of vitamin B3 — the most quietly effective ingredient in skincare.
The science.
Niacinamide is the amide form of vitamin B3 (nicotinic acid). It's water-soluble, stable in formulation, and tolerated by most skin types. It's been in clinical use for over 60 years.
How it works
Niacinamide regulates sebum production, reduces visible pore appearance, calms inflammation, reduces post-acne hyperpigmentation, and supports the skin barrier. It works at the cellular level by increasing ceramide synthesis.
Right for which skin types?
All skin types. Particularly strong for: oily/acne-prone skin, post-acne pigmentation, rosacea-prone skin, sensitive skin.
How to use it
5-10% concentration, once or twice daily. Apply after cleansing, before heavier serums. Layer with vitamin C, retinol, hyaluronic acid — niacinamide plays well with everything.
Side effects
Rarely. Higher concentrations (10%+) can trigger histamine flushing in sensitive skin. Drop to 5% buffered.
Top recommendations.
- Niacinamide 10% + Zinc 1% by The Ordinary — $13 · Category benchmark
- Niacinamide 5% Calming Serum by Paula's Choice — $56 · Sensitive skin
- Pure Niacinamide Booster by SkinCeuticals — $135 · Clinical-grade
Common questions.
Can I use niacinamide and vitamin C together?
Yes. The 'they cancel each other out' claim is from a 1960s study with raw nicotinic acid. Modern formulations layer fine.
How long until results?
Sebum and pores: 2-4 weeks. Pigmentation: 8-12 weeks. Niacinamide is the slowest-acting effective ingredient.
Should I use it morning or evening?
Either or both. Niacinamide is photo-stable and doesn't increase UV sensitivity.