TOPICAL COMPOSITIONS CONTAINING VITAMIN C
The present invention provides topical compositions comprising a combination ascorbic acid, caffeine, an inorganic salt, and water that are single aqueous phase compositions.
1 . A topical composition comprising about 5% to about 22% by weight of ascorbic acid based on the total weight of the composition, about 1 to about 5% by weight of caffeine based on the total weight of the composition, at least 0.2% by weight of an inorganic salt selected from the group consisting of sodium sulfite, potassium sulfite, sodium bisulfite, and sodium metabisulfite based on the total weight of the composition, and at least 28% by weight of water based on the total weight of the composition, wherein the composition is a single aqueous phase.
2 . The composition of claim 1 further comprising at least 35% by weight of 1,3-propanediol based on the total weight of the composition.
3 . The composition of claim 1 further comprising at least 0.1% by weight of ethylenediaminetetraacetic acid based on the total weight of the composition.
4 . The composition of claim 1 , wherein the inorganic salt is sodium bisulfite.
5 . The composition of claim 1 further comprising hyaluronic acid.
6 . A topical composition comprising about 10% by weight of ascorbic acid based on the total weight of the composition, about 2% by weight of caffeine based on the total weight of the composition, about 0.5% by weight of sodium bisulfite based on the total weight of the composition, at least 38% by weight of water based on the total weight of the composition, about 40% by weight 1,3-propanediol based on the total weight of the composition, and about 0.2% by weight of ethylenediaminetetraacetic acid based on the total weight of the composition, wherein the composition is a single aqueous phase.
7 . A topical composition comprising about 15% by weight of ascorbic acid based on the total weight of the composition, about 2% by weight of caffeine based on the total weight of the composition, about 0.5% by weight of sodium bisulfite based on the total weight of the composition, at least 33% by weight of water based on the total weight of the composition, about 45% by weight 1,3-propanediol based on the total weight of the composition, and about 0.2% by weight of ethylenediaminetetraacetic acid based on the total weight of the composition.
8 . A topical composition comprising about 20% by weight of ascorbic acid based on the total weight of the composition, about 2% by weight of caffeine based on the total weight of the composition, about 0.5% by weight of sodium bisulfite based on the total weight of the composition, at least 28% by weight of water based on the total weight of the composition, about 45% by weight 1,3-propanediol based on the total weight of the composition, and about 0.2% by weight of ethylenediaminetetraacetic acid based on the total weight of the composition.
9 . A cosmetic method for treating skin, comprising topically applying to skin in need of treatment for skin brightening or lightening the topical composition of claim 1 .