The body requires a certain amount of vitamins and minerals every day to function properly. Experts agree that supplementing your diet with a good multi-vitamin and mineral supplement is not a bad idea. Think of it as an insurance policy for your body.
Many vitamins and minerals play crucial roles in the body's metabolic and anabolic processes. If you are deficient, your body is not going to be functioning as smoothly as it should and you could be hurting your progress and your health.