Are There Any Side Effects to Watch Out For?
For most people, no. The main thing to watch for is overloading your skin with too many potent actives in one sitting, not because niacinamide and vitamin C fight each other, but because any high-strength actives, layered together too aggressively, can overwhelm sensitive or beginner skin. If you’re new to actives, ease in by alternating nights, niacinamide one night, vitamin C the next, and build up from there once your skin adjusts.
