Ghee is clarified butter that has been cooked slowly until all the moisture and milk solids have evaporated, leaving behind high-quality butterfat that is perfect for Bulletproof coffee giving it healthy fats and a nutty buttery flavor. Butter is made by churning cream or milk so it doesn't contain the fatty acids that are found in clarified butter. It also contains small amounts of lactose and casein which can be problematic for some people.