Nutrition is a large part of becoming - and staying - healthy. And vitamins, minerals and dietary supplements are the building blocks of good nutrition. In this manual, I have attempted to give a useful overview of the most common and beneficial vitamins, minerals, and dietary supplements that the human body requires for a long and healthy life, and offered what insight I can from more than forty-six years as a physician as well. In each case, I've covered at least some background on the substance itself, its benefits and biological function, and included basic information on toxicity and dosage. Each of us will have to experiment a little to find what seems to fit for individual needs and desires. And always consult your doctor, pharmacist or other health professional before taking any medication, vitamins, minerals, or supplements. What follows represents only a selection of the vitamins, minerals, and supplements you may encounter.