Almost 6000 male physicians 65 and older received either a daily multivitamin supplement or placebo. Testing after 8.5 years of follow-up showed no significant difference in verbal memory or global cognition. In yet another study, 1700 adults aged 50 or older were given a multivitamin or placebo beginning 6+ weeks following a heart attack. After 4.5 years the outcomes were no different for either group. Both studies were randomized and double-blind.
PositiveTip: Supplementing the diet of well-nourished adults has no clear benefits. Enough is enough!