Common Supplements and their effect purpose

There are alot of supplments out in the marketplace and most folks aren't sure what they are used for.

Here is a brief outline of a few most folks don't know about:
Calcium: RDA-1000mg/day - Milk/milk products - Strong bones, teeth, regulate heart beat and muscle action/nerve function, blood clotting.
Chromium: no RDA - Corn oil, whole grain cereals - Glocose metabolism (energy)
Iodine ; 150mcg/day - Seafood, iodized salt - Helps form hormone thryozine which regulates metalbolism.
Magnesium : No RDA - Nuts, green vegetables, whole grains - Maintains bodys PH balance, assists in metabolizing carbohydrates and minerals.
Selenium: 50-200 mcg/day - Seafood, lean meats, grains - Protects body tissues against oxidative damage from radiation and assists with normal metabolic processing.
Zinc: 15mg/day - Lean meats, eggs, seafood, whole grains - Improves digestion and metabolism, aids in healing from injury, may reduce bad (LDL) cholesterol.

Most of the above are included in a good multi-vitamin/mineral supplement. I recommend taking an extra 500 mg zinc in addition to a high potency multivitamin/mineral supplement.