Supplements are available for sale non-prescription at your neighborhood pharmacy or online without a prescription. Still, you must check along with your doctor before taking any product or talk with a healthcare provider about other prescribed or over-the-counter medicines or supplements you’re already taking. It’s especially necessary to ask your doctor about taking a supplement if you’re pregnant or nursing, about to have surgery, or you have a health condition such as high blood pressure, heart problems, or diabetes.Also, don’t give a supplement to a child without checking with his or her healthcare provider.