Patent ID: 8828955

Claim:
A method for promoting glutathione production in human cells in need of promoting glutathione production in vivo or animal cells in need of promoting glutathione production in vivo, comprising steps of: preparing a glutathione production enhancer containing, as an active ingredient, a licorice extract composition that contains liquiritin, liquiritigenin, isoliquiritin and isoliquiritigenin, wherein dry solid content of glycyrrhizic acid in the licorice extract composition is no greater than 1.0 wt % in combination with a total combined amount of the liquiritin, liquiritigenin, isoliquiritin and isoliquiritigenin in the licorice extract composition of no less than 10.6 wt %; and administering an effective amount of the glutathione production enhancer to a predetermined site of a human or an animal for promoting glutathione production.