... Serenoa repens Plant part used Fruit (Berry) Active Ingredient Fatty acids and Sterols (Oleic acid, for example) Specification ... and historically for humans. It contains constituents such as fatty acids, steroidal saponins, phytosterols, volatile oil, resin, ... fatty acids and phytosterols. These fatty acids include capric, caprylic, caproic, lauric, palmitic, and oleic acid and their ethyl esters. ...