A nutritional supplement is a product with minerals and other ingredients that are intended to improve the user's health. They can be purchased from the market (OTC) or be marketed as being "natural" or "sustainable." However, just because the product is labeled a nutritional supplement, it does not mean that it is safe to consumption for pregnant women or minors. If you are pregnant or suffer from diabetes, high blood pressure kidney disease, any other medical condition you should study and comprehend the labels before purchasing any nutritional supplement.