Diosgenin is classified in the group of steroid sapogenin (The chemical structure of diosgenin is same as the steroid hormons.), and it is known as component of the root of Dioscorea japonica and Dioscorea batatas .
Diosgenin is contained in herbs such as Trigonella spp., Polygonatum spp., Smilax spp. and other several plants.
Diosgenin has the diversified pharmacological activities, and the following pharmacological activities are reported, based on the animal model experiments ;
（１） anticancer activity
（２） alleviating activity against food allergy
（３） Inhibitory effect for memory impairment induced by oxidative stress through administration of galactose
（４） Improvement effect for diabetic neuropathy