Yes that is all correct and has been written about extensively in books by doctors and even pharmacists who decry the way the medical profession is being handled and that is why I decided to apply the old saying about “the tail wagging the dog,” where the tail is only supposed to be a small part of the picture yet is in the end far too significant. There are more deaths attributed to drugs than there are to supplements by a long shot. It is frankly not supposed to be this way, but you will see a very good rendition of how it came about by listening to the Ty Bollinger series on cancer. which is still available online.
Naturally eating a proper diet and having enough exercise is supposed to be the base of good health, but supplements can be used very effectively to bring on healing.