Another good web site can be found here . Again, try to avoid processed foods with partially-hydrogenated oils in it. You don't need to buy any other supplements from the health food store. No chromium picolinate, no HMB, no CLA, no Arginine or any other individual amino acid, no L-Carnitine. Save your money.
Some people say that supplements are things that are found in food.
But there are many drugs that are found in food. A better definition is that a supplement is found naturally in food, but also is used by the body as fuel or a building block for muscles, bones, etc. A drug is a chemical, either found in nature or manufactured in a laboratory, that effects the body via some chemical reaction or receptor interaction. Caffine is a drug. Its found in many edible plants, but it has a stimulating effect on the body.