Whether he’s an elite athlete or a desk jockey, a healthy guy with a good diet should take one low-dose multivitamin, such as Centrum, each day. Nothing more. In the most comprehensive clinical trials in the world for healthy men, low doses of vitamins and minerals have been associated with the best results. The SU.VI.MAX French clinical trial, for instance, involved more than 10,000 healthy men and women who took either a supplement or a placebo every day for more than seven years. The men who took a daily supplement reduced their risk of heart disease, cancer, and early death.