Niacinamide calms inflammation and evens out the red or brown marks acne leaves behind. It's one of the best-tolerated actives that exists, which is exactly why it's not a lead: gentle enough to layer with almost anything, but not strong enough to clear active breakouts on its own.
Worth having in a routine for the marks it leaves, not instead of something that treats the breakouts themselves. Pair it with benzoyl peroxide or a retinoid, don't use it as a substitute for either.
Ranked honestly against the other things people reach for. Same concern, different pathways.
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Take the quizSource: Acne vulgaris: management (NG198), Treatment of Acne Vulgaris During Pregnancy and Lactation: A Narrative Review · 0 affirmed claims