Saponin is a class of glycoside compounds commonly found in various plants. Saponin can protect plants from microbial and fungal damage.Saponin is a secondary metabolite that facilitates the penetration of proteins through the cell membrane. Studies indicate that saponins are amphipathic glycosides, which can act as hemolytic agents. Research indicates that Saponin displays antinociceptive, anti-inflammatory and antipyretic activities, which may be due to its nonglycosidic moiety, sapogenin. Saponin can also be used in environmental research to recover chromium and other metals from sludge samples. Additional studies indicate that Saponin is useful in immunoassays since it can stimulate the Th1 immune response and the production of cytotoxic T-lymphocytes in response to exogenous antigens.