When it says sterol, don't confuse sterol with steroid or think that it has some muscle-building or fat cutting properties. Plant sterols are good for general heart health and are supposed to reduce cholesterol, and reduce heart disease. It would be good to take on a Prohormone cycle, where your cholestorol goes all out of wack, or if you're concerned about your heart health, but don't expect to see muscle-building properties from taking them.