If you have been looking for a cleanse that does not leave you starving and feeling deprived, then congratulations on discovering this one! As far as cleanses go this is the easiest one I have found and elicits the best results. The Standard Process 21-Day Purification works on 5 Vital bio-systems including the Colon, Liver, Lungs, Skin and Circulatory System. In addition to all those fine points it also help to clear toxins and exogenous hormones from your body.