A gentler relative of hydroquinone — plausible chemistry, surprisingly little independent human data.
Alpha arbutin is a stabilized glucoside of hydroquinone that slowly releases small amounts of it in skin, inhibiting the pigment enzyme tyrosinase without hydroquinone's harshness. The mechanism is sound; the question is how well the gentle version performs in practice.
Typically 1–2% (the SCCS-reviewed safe range in creams).
Popular brightener, thin independent evidence
Despite its popularity, independent randomized trials of alpha arbutin alone are scarce — much of the support is in-vitro, in combination products, or manufacturer-run. It plausibly helps mild uneven tone; stronger-evidence options exist (azelaic, tranexamic).
Anchored to regulatory assessments — not hazard lists. Dose makes the poison; these are the conclusions at real-world cosmetic use.
SCCS considers alpha-arbutin safe at up to 2% in face creams; it flagged the theoretical release of hydroquinone as acceptable within these limits.
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