For the big colon cleansing job, I used Schulze's formulas. www.herbdoc.com No, it's not stressful on the body to be cleaning it out. You just have to do it over time. If you got rid of so many toxins at once it would kill you. Be patient. Your body will thank you. What I think is stressful on the body is not getting enough good nutrients to keep your strength up. A body with cancer is extremely depleted in nutrients. It's starving. Our food supply today doesn't contain enough nutrients. Make sure you are getting the nutrients as foods themselves are detoxifying as well as re-building. Probably the worst thing is not getting enough protein to support your body. juicing fresh veggies and adding some Sunwarrior protein to that is good. Organ meats as your body needs the RNA and DNA to help build the body back up. Make sure you're getting enough B12 if you're vegetarian.