Kojic Acid
Mushroom-derived brightener
BGood evidence (some RCTs)Safety: Use with caution
Chemical Function
Tyrosinase inhibitor that fades pigmentation.
Scientific Evidence
Studies show skin lightening; potential for irritation and allergy with prolonged use.
Quality of EvidenceModerate
Interactions
Can be sensitizing; patch-test; rotate with other brighteners rather than layering many.
Pro-Aging Relevance
Fades age spots, though irritation risk warrants caution.
The Science Behind Kojic Acid
Kojic acid blocks tyrosinase, the enzyme that makes pigment. It fades spots but can irritate and sensitize, so it is best used in rotation and patch-tested first.
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