I do the Master-Cleanse specifically for the purpose of intestinal cleansing. I just finished 48 days MC, and am following with ten of juice--with a colonic every 10 days. UNBELIEVABLE results!
Take the task of digestion off the intestines, and let the lemon and cayenne do their thing! See the Master-Cleanse forum for details and if you have questions--it is an incredibly supportive and active group.