We have had to switch to an alternate formula for ProPhree Calorie supplement by another manufacturer, but the main source of our nutrition comes from formulas provided by other companies. Even so, we have run into supply issues. Because so many patients from Abbott formulas have switched the the formulas that we have used for years we are now bnot receiving our formula(s) because too many patients are demanding from Nutricia and the manufacturer & third party DME supplier have my primary formula on backorder. I have recieved a 1 month supply in the last 3 months! I have experienced significant GI upset by the switch. My children have only mildly been affected by the switches.