Dosage

Generally, licorice root of pharmaceutical grade, must contain not less than 4% glycyrrhizic acid, calculated on the basis of the dried root. In addition, the presence of glycyrrhetic acid must be shown by a thin-layer chromatography (TLC) assay. Also the water-soluble extractive content must be not less than 20.

Oral
glabridin

It is recommended that, unless otherwise prescribed, an average daily dose of crude plant material …

Topical
glabridin

Licorice may be used in the formulation of topical creams or lotions for cosmetic purposes…