How safe is the master cleanse? this cleanse includes 10 days of drinking fresh lemonade sweetened with maple syrup and cayenne, and no food.

It's relative.: If you are a healthy 26 year old male without diabetes or any major chronic illness, the master cleanse is safe, but quite extreme. It is basically a ten-day fast, which is not good for your metabolism. I would suggest you find shorter "cleanse" options at your local health food store, that contain vitamins and nutrients to keep your body running, and in balance.