Supplements are substances extracted from various vegetable or mineral products. The role of nutritional supplements is to bring in food substances that are missing or suboptimal concentrations in the body. Dietary supplements are extremely effective when seeking a higher concentration of nutrients for different purposes: burn fat, antioxidants, etc.. Simple regular food intake may not provide the necessary nutrients that you wish to bring in the body, so alternative sources will be sought to ensure these nutrients. Consumption of dietary supplements provide the body the necessary nutrients it needs and you can not get from elsewhere (normal diet).