Niacinamide

Niacinamide (vitamin B3) is the quiet multitasker of skincare — it regulates oil, supports the barrier, refines the look of pores, calms redness, and helps even tone, all while being gentle enough for nearly everyone. It's one of the most versatile and well-tolerated ingredients you can use, which is why it appears in so many formulas. Use it morning or night, before heavier creams, at concentrations around 5% for most skin (higher isn't necessarily better and can irritate). Especially useful for Oily Skin, Pores and Acne & Breakouts.