“Vitamin C serum brightens skin and reduces signs of aging.”
Vitamin C serums can lighten dark spots and smooth fine wrinkles a little, based on small randomized trials, but results vary by product.
A vitamin C serum gives, at best, a modest improvement in dark spots and fine lines, and it takes months. A higher percentage or a "brightening" label does not guarantee better results.
If you try one, use it daily for about three months before judging it, and stop if it stings or irritates.
Safety note: Low-pH L-ascorbic-acid products can sting, dry or irritate skin. Layering several acids, retinoids or scrubs at once raises irritation risk.
Talk to a healthcare professional if: a dark spot is new, changing, or uneven in shape or color, or a product makes your skin very irritated.
A 2023 review of seven small randomized studies with 139 people found smoother, less wrinkled and more even skin with topical vitamin C. Confidence is limited because the trials were small, used different formulas, and some combined vitamin C with laser treatment.
Vitamin C serums can lighten dark spots and smooth fine wrinkles a little, based on small randomized trials, but results vary by product. Benefits take months and depend on the form of vitamin C, its strength and how stable the product is.
In a six-month double-blind trial, a 5% vitamin C cream improved skin surface texture and reduced deep furrows compared with a placebo cream. A three-month split-face trial of a vitamin C serum in 19 adults found better scores for fine wrinkles, roughness and yellowing on the treated side than on the placebo side. Skin hydration improved equally with vitamin C and placebo, and no ideal strength has been established.
- Correia G, Magina S. Efficacy of topical vitamin C in melasma and photoaging: a systematic review. Journal of Cosmetic Dermatology. 2023;22(7):1938-1945. doi:10.1111/jocd.15748. PMID:37128827
- Humbert PG, Haftek M, Creidi P, Lapière C, Nusgens B, Richard A, Schmitt D, Rougier A, Zahouani H. Topical ascorbic acid on photoaged skin. Clinical, topographical and ultrastructural evaluation: double-blind study vs. placebo. Experimental Dermatology. 2003;12(3):237-244. DOI: 10.1034/j.1600-0625.2003.00008.x. PMID: 12823436
- Traikovich SS. Use of topical ascorbic acid and its effects on photodamaged skin topography. Archives of Otolaryngology: Head & Neck Surgery. 1999;125(10):1091-1098. DOI: 10.1001/archotol.125.10.1091. PMID: 10522500