According to species, tubers yield 1% to 8% of total sapogenins, the principal of which is diosgenin with small quantities of the 25β-epimer yamogenin. While D. composita may contain 4% to 6% total saponins, D. floribunda has 6% to 8% diosgenin. Disogenin is present as a dioscin, the glycosidic form from which it is obtained on hydrolysis.