To use a nutritional supplement, you have to know what your patient needs, and what is provided in the formula. You need to read the detail information of each formula to select the most appropriate supplement. For PD patients, in general, the requirements are 1. fluid restriction, 2. slightly higher protein content, 3. low phosphate, 4, low sodium. That means you need to find one formula that contains higher calorie and protein per ml, and less phosphorus to protein ratio. Ensure is not the best choice based on this criteria, but under certain conditions, ensure can be a right choice for a PD patients.