10 Supplements That Do Not Work as Advertised

Vitamin D for Heart Health
There is some evidence that vitamin D supplements can help protect you against rickets, but they won’t really contribute to heart health. © Scharvik/iStock/Thinnkstock

Sun exposure gives the biggest delivery of vitamin D to your body; as much as 80 to 90 percent of all your vitamin D intake happens this way [source: National Institutes of Health]. Supplementing your diet with vitamin D is a good way to prevent bone conditions such as rickets and osteomalacia, as well as to treat the skin condition psoriasis. But if you're taking vitamin D in an effort to reduce your risk of developing heart disease, don't bother. While studies indicate a person with higher levels of vitamin D circulating through his body has a lower risk of developing heart disease or having heart failure than a person with low levels of the vitamin, there's no conclusive evidence that supplementation in an effort to prevent heart failure or boost heart health makes any discernible difference in your health -- and some studies have found vitamin D supplementation had a negative effect on the heart, the very opposite of what you want from your vitamins and minerals [source: National Institutes of Health, Mayo Clinic].