While there is ongoing debate over optimal use of supplements and their effectiveness, and while supplements cannot take the place of a healthy diet, Dr. Weil recommends them for a variety of reasons:
1. A good daily multivitamin/multi-mineral supplement can work as insurance against gaps in the diet - for example, to cover those days when you are on the road and simply can't get the fruits and vegetables you need.
2. The more regularly we supply our bodies with antioxidants and phytonutrients, the better our nutritional requirements will be met on a daily basis, and the better our overall health will be.
3. Supplements can provide natural therapeutic agents in optimal dosages that may be difficult to obtain from diet alone, and that may help prevent and address age-related diseases
...from Dr. Weil website.