... can also be found in many other plants. It is part of a group of chemicals known as phytosterols. These steroid alcohols ... usually insoluble in water, and are chemically similar to cholesterol, a compound found in animals.Collected from plants, stigmasterol can be ... progesterone for medical use. Progesterone can also be used as a precursor for an assortment of estrogens, androgens, and corticoids, ...