Health claim
“Vitamin C serums at 10–20% concentration brighten hyperpigmentation more effectively than lower concentrations.”
Claim checked — mixed / earlyHigh risksupplements
Evidence Summary
Some evidence supports this, but findings are inconsistent or limited in scope.
Research indicates that 10–20% L‑ascorbic acid formulations can improve hyperpigmentation more than lower concentrations, but benefits plateau and higher levels increase irritation, so the advantage is not uniformly strong.
Extracted from
The Most Science-Backed Skincare Routine | Dr. Danny GuoDr. Danny Guo
Dr. Danny Guo outlines a concise, evidence‑informed skincare routine, emphasizing simplicity and scientifically supported product choices.
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