A good multi vitamin should be a staple in every athletes cupboard. Even more so if you use prohormones/AAS/anti-estrogens. Since athletes generally push their bodies to the limit virtually everyday, the body needs far more nutrients than the average "Joe" in order to operate at it's best. You can be robbing yourself of gains drastically if the amount of nutrients your body needs are not met. Give your body the nutrients it needs to continue striving for whatever goals you have.