The largest, randomized, double-blind trial to date has confirmed what smaller studies have suggested and what many physicians have long believed: a daily multivitamin does not reduce the risk of CVD.
Over a median follow-up of 11.2 years, 1732 CV events occurred, but the rate of events was no higher among men taking placebo than those taking a daily multivitamin. Rates of major CV events were 11 and 10.8 per 1000 person-years in the multivitamin and placebo groups, respectively.
Here is the abstract from the actual study
Among this population of US male physicians, taking a daily multivitamin did not reduce major cardiovascular events, MI, stroke, and CVD mortality after more than a decade of treatment and follow-up.
In a not so surprising result, a large well controlled study does not find any benefit to taking a daily multivitamin to improve your cardio-vascular health. Multivitamins are attractive to people because they are a cheap, easy and painless way to feel like looking after your health.
The evidence is in people, it’s not really worth it. Taking vitamins is not a substitute for having a healthy diet and getting plenty of excersise. Unless you’re vitamin deficient, save your money.