I take Centrum multivitamin and folic acid. I'm thinking of adding glucosamine and chondroitin.
There is probably enough folic acid in general multivitamins to satisfy men's folic acid needs
(they need at least 400 mcg/day
), but women of reproductive age, especially those on the pill, need more
(the pill and some other medications prevent the absorption of folic acid
). Not only does it prevent birth defects, it has also been shown to prevent cervical and colorectal cancers and possibly breast and stomach cancers.
Studies show that only 9% of Americans eat the recommended servings of fruits and vegetables. If you're not eating many green vegetables or fortified cereals, you could use some folic acid.
I can't offer specific evidence that a multivitamin improves my performance, but I feel like I'm in pretty good health and that regular vitamin consumption has helped. There are adverse effects if you take too much of certain vitamins
(fat-soluble
) and minerals. Water-soluble vitamins, like vitamin c, are simply flushed from the body if you take too much, but fat-soluble vitamins, vitamins a, d, e & k, are stored in your liver if they aren't needed, which can eventually be toxic. High levels of minerals, like iron, can cause organ and bone damage over time.
If you take no more than a multivitamin
(unless your doctor specifies otherwise
), you shouldn't have any cause for concern. You can, however, have your vitamin and mineral levels checked for a relatively low cost
(I've seen companies offer blood tests for around $35
).