Niacin (Vitamin B3)

Niacin is the base molecular form of vitamin B3, alongside its amide niacinamide. On skin it converts partly to niacinamide and shares its core benefits — barrier support, brightening, sebum balance — but niacin can trigger transient vasodilation (flushing) in sensitive individuals, which is why niacinamide is the preferred cosmetic form. In rinse-off or combination products niacin appears mainly as part of B3 complexes. Users reacting with redness to a "B3" product usually met niacin, not niacinamide. Effective, well-studied vitamin chemistry — just choose the amide form for leave-on facial care.