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1. An aqueous cosmetic skin-care composition comprising; (a) about 0.5 wt. % of baicalin and/or about 10 wt. % vitamin C;(b) about 5 wt. % of each of the hydrotropes caffeine and niacinamide, wherein the amount of said hydrotropes is effective to increase transdermal penetration of baicalin and/or vitamin C; and(c) water;wherein said skin care composition is in the form of a lotion, serum, gel, milk, foam, liquid foundation, or cream, and is suitable for topical application to the skin. 2. The composition of claim 1, wherein the composition is a serum. 3...
1. An aqueous cosmetic skin-care composition comprising; (a) about 0.5 wt. % of baicalin and/or about 10 wt. % vitamin C;(b) about 5 wt. % of each of the hydrotropes caffeine and niacinamide, wherein the amount of said hydrotropes is effective to increase transdermal penetration of baicalin and/or vitamin C; and(c) water;wherein said skin care composition is in the form of a lotion, serum, gel, milk, foam, liquid foundation, or cream, and is suitable for topical application to the skin. 2. The composition of claim 1, wherein the composition is a serum. 3. The composition of claim 2, wherein the serum further comprises dipropylene glycol, PEG-4, and/or alcohol. 4. The composition of claim 1, wherein the composition is an oil-in-water emulsion. 5. The composition of claim 4, wherein the oil-in-water emulsion further comprises: polysorbate 61, phenoxyethanol, sodium stearoyl glutamate, disodium EDTA, octocrylene, isopropyl lauroyl sarcosinate, octyldodecanol (and) oxtyldodecyl xyloside, glyceryl stearate, stearyl alcohol, caprylyl glycol, p-anisic acid, and/or isotridecyl isononanoate. 6. The composition of claim 1, further comprising: (d) at least one additive conventionally used in the cosmetics field selected from the group consisting of a thickener, a fragrance, a pearlescent agent, a preservative, a sunscreen, an anionic polymer, a nonionic polymer, a cationic polymer, an amphoteric polymer, a protein, a protein hydrolysate, a fatty acid, a vitamin, panthenol, a silicone, a vegetable oil, an animal oil, a mineral oil, a synthetic oil, a gelling agent, an antioxidant, a solvent, a filler, an odor absorber, and a coloring material. 7. A method for increasing the bioavailability of vitamin C and/or baicalin comprising topically applying to skin an aqueous cosmetic skin-care composition according to claim 1. 8. A method for protecting skin from photoaging comprising applying a composition according to claim 1 to the skin. 9. An aqueous cosmetic skin-care composition comprising; (a) about 0.5 wt. % of baicalin and about 10 wt. % vitamin C; (b) about 5 wt. % of each of the hydrotropes caffeine and niacinamide, wherein the amount of said hydrotropes is effective to increase transdermal penetration of baicalin and vitamin C;(c) water; and(d) at least one additive conventionally used in the cosmetics field selected from the group consisting of a thickener, a fragrance, a pearlescent agent, a preservative, a sunscreen, an anionic polymer, a nonionic polymer, a cationic polymer, an amphoteric polymer, a protein, a protein hydrolysate, a fatty acid, a vitamin, panthenol, a silicone, a vegetable oil, an animal oil, a mineral oil, a synthetic oil, a gelling agent, an antioxidant, a solvent, a filler, an odor absorber, and a coloring material;wherein said skin care composition is in the form of a lotion, serum, gel, milk, foam, liquid foundation or cream and is suitable for topical application to the skin. 10. The composition of claim 9, wherein the composition is a serum. 11. The composition of claim 9, wherein the composition further comprises dipropylene glycol, PEG-4, and/or alcohol. 12. The composition of claim 9 comprising 5 wt. % to 40 wt. % of component (d). 13. A method for increasing the bioavailability of vitamin C and/or baicalin comprising topically applying to skin an aqueous cosmetic skin-care composition according to claim 9. 14. A method for protecting skin from photoaging comprising applying a composition according to claim 9 to the skin.