You need to be careful when you are shopping for some type of supplement. There are many fake supplements that are sold nowadays. But that doesn’t mean that all supplements are fake. "The majority of supplement manufacturers are responsible and careful," FDA's Yetley says. Consumers should still do search for right supplement with care, making sure they have necessary information and consulting with their doctors and other health professionals.

Supplement – claims.

According to FDA, manufacturers can use structure-function claims without FDA authorization. They base their claims on their review and interpretation of scientific literature. These claims must be accompanied with disclaimer "This statement has not been evaluated by Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease."

Another important vitamin supplement is supplement for vitamin D. The major function of vitamin D is to maintain normal blood levels of calcium and phosphorus, helping to form and maintain strong bones. Vitamin D can be found in foods (for example vitamin D fortified milk, fatty fish, and fish oils). Another important source of vitamin D is exposure to sunlight (ultraviolet rays).

Vitamin supplement - vitamin E.

Vitamin supplement for vitamin E is another example of important supplement. Vitamin E is a very powerful biological antioxidant, which plays a great role in preventing cell damage that may contribute to development of cardiovascular disease and cancer. Vitamin E can be found in, for example, vegetable oils, nuts, and green leafy vegetables. If you do not intake enough vitamin E with your foods, vitamin supplement will help.