People under the care of a medical doctor for any medical condition and all those taking prescribed medications should check with their doctor before beginning an Isagenix program or any other nutritional program. Show your doctor the ingredients list from all the products you plan to use. Explain that you want to begin following a healthy, low-calorie eating program that involves fasting and uses nutritional supplements. Request that your doctor monitor your results if you do begin an Isagenix program. As your health improves, you may not need as much medicine, but only your doctor can decide this.