Food supplements are just for medical purpose. It is good for people who can't eat they are like medicines. It is not made for normal people who can eat. It is supplements not the food it can't replace food.. ya in long term it has side effects. For normal people it can overload Kidneys as so much of protein is also not good. Patietn in diseases require supplements more. Especially in hospital admitted patients who can't eat like in comatic state they need good nutrition which can be given through supplements. Where protein requirements are quite high and difficult to achieve their supplements play a great role. Every doctor should have knowledge of that is not compulsory bit little known can also work. But nutrionist should have complete knowledge of supplements as it is related to nutrition and important for them to have its knowledge.