Patent ID: 8574568

Claim:
A method for stabilization of reduced coenzyme Q 10 against oxidation, comprising providing a reduced coenzyme Q 10 -containing composition containing reduced coenzyme Q 10 and a propylene glycol fatty acid ester, wherein the retention rate of reduced coenzyme Q 10 after being preserved in air at 40° C. for 2 weeks is not less than 80 wt %, by mixing a propylene glycol fatty acid ester with reduced coenzyme Q 10 to prepare a composition which protects reduced coenzyme Q 10 from oxidation, wherein a fatty acid residue of the propylene glycol fatty acid ester is one or more fatty acid residues selected from the group consisting of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid and linolenic acid, and wherein the amount of propylene glycol fatty acid ester in the composition is not less than 20 wt % and the amount of reduced coenzyme Q 10 in the composition is not more than 40 wt %.