P&B shakes work well for people who have strong peristaltic movement, but may have clogged bowels. This is often indicated by very thin bowel movements. P&B shakes work by sweeping the lining of the colon and taking old mucus and fecal matter with it. Proper hydration is essential when doing the shakes.
Oxypowder contains primarily magnesium and works by drawing fluid into the bowel which liquefies the fecal material. It is said that the formula also releases oxygen the helps colon health. It is good for people who tend to have hard dry bowel movements and frequent constipation. Once again plenty of water is important, a mineral supplement would be good for those who lose a lot of fluid on the cleanse.
For those who lack good peristaltic movement an herbal laxative may be the first thing needed. Products contains senna leaf, Cascara Sagrada, Turkey rhubarb, or the compound Triphala all stimulate peristaltic movement and help with elimination. Some of these herbs can cause dependency and long term use is not recommended. Once peristalsis is established, switching to a high fiber cleanse can continue the cleansing process.