Which vitamin is often used in serums for brightening skin?

Which vitamin is often used in serums for brightening skin? Vitamin C is the answer.

Vitamin C is the skincare name for ascorbic acid and related vitamin-C derivatives. Applied topically, it is valued for antioxidant activity and for helping reduce the appearance of uneven pigmentation by interfering with melanin production. That makes it a common ingredient in brightening serums, especially those marketed for dullness and dark spots.

Vitamin C is also an essential dietary nutrient involved in collagen formation, wound healing, and connective-tissue maintenance. In skincare, however, eating vitamin-C-rich foods and applying a vitamin-C serum are different uses: dietary vitamin C supports the body generally, while a topical product delivers the ingredient directly to the skin.

A common mix-up is confusing vitamin C with niacinamide, also called vitamin B3. Niacinamide is another popular ingredient for uneven tone and barrier support, but it is not the stored answer to this question. Vitamin C formulas can oxidize when exposed to light and air, so packaging and product stability matter.