Dietary supplements are products that supplement the diet. Supplements are supposed to provide vitamins and nutrients that the body lacks for a particular reason. They are often confused with medication. Medicines are a more effective way to combat symptoms such as weakness and are prescribed by a doctor for a reason. Although supplements are by design only a dietary supplement, taken in the wrong doses or in the wrong cases, they can be harmful. To properly supplement your diet with supplements, it is worth taking consultation with a nutritionist, be a doctor.