Vegetarians and vegans may want to investigate the excipients used in their supplements. Excipients come from a variety of sources, not all of which are plant-based. Gelatin, for instance, which is used to make capsules is an animal-based product. However, a vegetarian version is available that uses carbohydrate gum and glycerin in a base of naturally derived antioxidants--just look for the word "Vegicap" on the label. Lactose, which is used as a binder, comes from milk; cellulose, another binder, comes from plants. The lubricant magnesium stearate may be manufactured from plant or animal sources. If the label doesn't indicate that the Supplement is free of animal ingredients, call the manufacturer for a definitive answer.