Vitamin C Serums & Skincare

Vitamin C (L-ascorbic acid) is an antioxidant that is thought to help defend skin against free radical damage from UV and pollution. Studies suggest it may also help support the look of firmer, smoother skin and help visibly brighten an uneven-looking complexion.

Many dermatologists suggest applying vitamin C in the morning on clean, dry skin, since its antioxidant properties may help complement your daytime sun protection. It is best followed by moisturizer and a broad-spectrum SPF, which is recommended for everyone regardless of the products used.

Research suggests that concentrations of roughly 10 to 20 percent at a low pH offer good skin penetration, while going above 20 percent does not appear to add benefit and may increase the chance of irritation. If you have sensitive skin, starting lower and using it every other day to build tolerance is commonly suggested.

L-ascorbic acid is naturally unstable and can oxidize when exposed to air, light, and heat, which causes a clear or pale serum to darken toward yellow, amber, or brown. An oxidized serum is generally considered less effective, so storing it in a cool, dark place and discarding it once it darkens significantly is usually recommended.

Vitamin C is frequently formulated alongside vitamin E and ferulic acid, a pairing that studies suggest improves stability and antioxidant performance. Many people also use it with niacinamide and hyaluronic acid; if you are layering several active ingredients or have sensitive skin, introducing them gradually and patch testing first is a sensible approach.