Tyrosinase Inhibitor / Fermentation-Derived Brightener
A chelating agent derived from fungal fermentation (sake, soy sauce). Competitively inhibits tyrosinase — the enzyme responsible for melanin synthesis. Effective for hyperpigmentation and melasma, particularly in combination with glycolic acid. Can cause sensitisation at higher concentrations — patch test recommended.
At these concentrations this ingredient should appear above the 1% line on the INCI list. If you see it listed after preservatives or fragrance allergens, the dose is likely too low to work as marketed.
Topical 1–4% in serums, creams or spot treatments. PM use preferred; follow with SPF. Patch test first.
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