Vitamin C 10% Face Serum

Ascorbic Acid — An antioxidant that brightens dullness and helps defend against daytime free-radical damage — a morning serum ingredient. The label states 10%. Works from ~10%. OTC cap 20%. Give it 8–12 weeks for dark spots. Best for Normal, Combination, Oily. A morning antioxidant that brightens. High-strength L-ascorbic acid at a low pH can sting sensitive skin — go for a gentler derivative. Pricey for the %: beats 20% of the 11 Ascorbic Acid serums that state their strength.

Sodium Hyaluronate — A humectant that holds water in the upper skin — pure hydration, tolerated by essentially everyone, at any concentration. The strength is not printed, so we cannot judge the dose; that counts against the brand. Works from ~1%. Works Ongoing while you use it; no weeks-long build-up to wait for. Suits all skin types. Pure hydration — suits everyone, and dry or dehydrated skin most of all. Apply on damp skin and seal it in.

The Roles of Vitamin C in Skin Health ›

Skincare ingredients recommended by cosmetic dermatologists: A Delphi consensus study ›

A review of topical vitamin C derivatives and their efficacy ›