Bioassay of crude drugs for hair growth promoting activity in mice by a new simple method.

A simple method appropriate for measuring hair growth in mice has been devised in relation to the test animal's age and body region as well as of the hair-removing technique. Four commercial hair conics and 33 crude drugs were tested by this method for their effects on. hair growth in the posterior dorsal region of 5-week-old mice. The alcoholic extracts of Cinchona succirubra (bark), Dictamnus dasycarpus (root bark), Brassica juncea (seed) and Sophora flavescens (root) were found to promote hair growth in mice .