7 Skin Care Ingredients You Should Never Mix, According to Derms

Vitamin C and niacinamide are great ingredients when it comes to pigmentation issues, according to board-certified dermatologist Dr. Jason H. Miller, MD. But... don't mix them: "Both vitamin C and niacinamide are great for correcting redness and uneven skin tone," he explains. "However, they can cancel each other out if applied together."

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