BodyBio PC is extracted from soy lecithin. We test every batch of PC and have found zero presence of soy proteins in our supplement - it is the protein component of soy that is allergenic and/or estrogenic. Our PC is created using a proprietary extraction process leaving a highly purified complex of PC, PE, and PI. Because of our extraction process, the final product is a complex of isolated phospholipids that form liposomes while soy lecithin will not form liposomes in the body. Liposomes pass through the digestive system, allowing nutrients to get directly to the cells.