Composition comprising vitamin C prepared during application, use of enzymes for forming vitamin C for topical use, and a cosmetic treatment method

A method of preparing a composition for topical use comprising the steps of (1) separately storing at least one enzyme selected from L-galactono-1,4-lactone dehydrogenase, L-galactose dehydrogenase, L-sorbosone dehydrogenase, L-gulono-1,4-lactone oxidase and mixtures thereof, or of an extract comprising said enzyme, and at least one precursor of ascorbic acid, and (2) putting said at least one enzyme into contact with said at least one precursor, whereby upon contact ascorbic acid is formed.

A method for cosmetic treatment, consisting of applying to the skin a composition for topical application for extemporaneous preparation, comprising ascorbic acid and a suitable support, the ascorbic acid being obtained by bringing at least one ascorbic acid precursor with the exception of ascorbic acid esters into contact with at least one enzyme that is capable of converting said precursor.

A method for cosmetic treatment of the skin consisting of applying to the skin, either simultaneously or successively, at least one enzyme that can convert an ascorbic acid precursor into ascorbic acid, and at least one ascorbic acid precursor with the exception of its esters.