A nutritional supplement is a substance with minerals and other ingredients that are intended to improve the health of the user. These supplements can be bought over-the-counter (OTC) or be advertised as “natural” or “sustainable.” However it is important to note that just because a product is labeled as a nutritional supplement, it does not mean that it is safe for consumption for pregnant women or minors. If you are buying any kind of nutritional supplement, take the time to read the label and speak with your doctor before using them in case you are pregnant or suffer from diabetes, high blood pressure, kidney disease, etc.