Similac preparations, a group of commercial modified milk products that are prepared especially for infant feeding. They are made from a nonfat base of cow’s milk supplemented with such substances as lactose, coconut and soy oils, and monosaccharides and disaccharides and are fortified with vitamins and minerals. The ratio of the various nutrients, such as iron or one of the other minerals, is altered in the different preparations to accommodate infants with particular nutritional requirements or nutritional problems, such as nephrogenic diabetes insipidus. The formulas are packaged in both powder and liquid forms.