Sustagen has been around a long time. It is a supplement designed for people finding it difficult to meet their nutritional requirements through regular food alone. There are a variety of products for specific purposes. Nestle Health Science have just launched Sustagen Diabetic (vanilla flavour), specifically formulated to be low GI (34) for people with diabetes or pre-diabetes (type 1 or type 2) who are not eating well, or have a poor appetite, or are ill or recovering from illness. It provides essential nutrition without negatively impacting blood glucose levels. to be used under medical supervision.