Trace minerals or trace elements provide important amounts of key minerals the body needs in minute quantities compared protein, carbohydrate, fat, electrolytes and vitamins. The most common supplements include, copper, chromium, manganese, selenium and zinc. In addition, carnitine, choline, iodine, iron and molybdenum can also be included. For delivery into the stomach or intestine of adults, for example, standard amounts equal to the recommended dietary allowances (RDAs) are often provided in pre-mixed products by the manufacturer and usually met when approximately 1500 kcals of the commercial formula are given daily. For intravenous delivery, specific combinations of these are included in a single commercial sterile product, or as separate trace minerals, and are added by the Pharmacy each day.