Skin treatment compositions
Arbutin-containing compositions are useful for topical application to provide enhanced luminosity, brightening or lightening to the skin of a user and are at least 85% as efficacious (with regard to skin lightening, when used alone or in a system as measured by Chromameter® b* parameter values) as substantially corresponding compositions containing hydroquinone in an amount from about the same molar amount to about 1.5 times the molar amount of arbutin.
1. An arbutin-containing composition comprising:
arbutin in an amount from about 5% to about 10% by weight of the total composition;
a preservative in an amount from about 0.01 to about 5% by weight of the total composition;
a chelating agent in an amount from about 0.01 to about 5% by weight of the total composition;
a humectant in an amount from about 1 to about 20% by weight of the total composition;
an emulsifier in an amount from about 1 to about 20% by weight of the total composition;
a pH adjustment agent in an amount from about 0.01 to about 5% by weight of the total composition; and
a reducing agent in an amount from about 0.1 to about 10% by weight of the total composition, wherein the composition is at least 85% as efficacious with regard to skin lightening, when used alone or in a system as measured by Chromameter® b* parameter values as a substantially corresponding composition containing hydroquinone in an amount from about the same molar amount to about 1.5 times the molar amount of arbutin.
2. The arbutin-containing composition of claim 1 comprising an oil phase comprising an emollient, a preservative and an antioxidant.
3. The arbutin-containing composition of claim 2 comprising
emollient in an amount from about 2 to about 25% by weight of the total composition;
preservative in an amount from about 0.01 to about 5% by weight based on the total composition; and
antioxidant in an amount from about 0.1 to about 2% by weight of the total composition.
4. The arbutin-containing composition of claim 1 , comprising 7% arbutin.