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Top 10 niacinamide serum benefits
You can use niacinamide morning and night and it generally layers well with vitamin C, AHAs/BHAs and retinoids as long as you avoid introducing too many strong actives at once.
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Common questions about serums for oily skin and dark spots
In most modern formulas, niacinamide and vitamin C can be used together without any issue, and the combination can be quite helpful for oily skin with dark spots. Niacinamide supports the barrier, calms redness and helps reduce excess oil, while vitamin C provides antioxidant protection and gradual brightening. If your skin is on the sensitive side, you can make it easier by starting with lower‑strength vitamin C and using the combination only once a day, typically in the morning under sunscreen. If using two separate serums feels like too much, apply just one (for example vitamin C) in the morning and keep niacinamide for night, or use niacinamide daily and vitamin C on alternate days. If you notice stinging, redness that lasts beyond a few minutes, or new breakouts, scale back and reintroduce one ingredient at a time.