Dietary supplements are herbs, vitamins, minerals and other products that are intended to provide certain nutrients which may be insufficient in the body. They come in the form of drinks, pills, powders, energy bars and capsules.
There is no intensive testing for dietary supplements, but they are usually regulated by the FDA. Supplements are best for people who are allergic to certain foods. For example, people who do not consume dairy and poultry products can still have calcium through supplements. Before using a dietary supplement, it is sensible to consult a doctor first. Some supplements have active ingredients that may result in side effects, as stated by NIH.