Saponins are glycosides of steroids, steroid alkaloids (steroids with a nitrogen function) or triterpenes found in plants, especialy in the plant skins where they form a waxy protective coating. They dissolve in water to form a soapy froth.
Saponins are believed to be usefull in the human diet for controlling cholesterol.
Saponins have been identified in:
The saponin QS21 is being investigated for possible beneficial effects on the immune system.
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