What Do Ceramides Do for the Skin Barrier?
Ceramides are fats that help hold the skin’s outer layer together, which is why they appear in moisturizers aimed at dry or easily irritated skin.
What Niacinamide Does, in Plain Terms
Niacinamide is a gentle form of vitamin B3 that may support the skin barrier and even tone modestly; it helps, but it is not a fix on its own.
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