Iowa Code § 190.6
No milk, cream, skimmed milk, buttermilk, condensed or evaporated milk, powdered or desiccated milk, condensed skimmed milk, ice cream, or any fluid derivatives of any of them shall be made from or have added thereto any fat or oil other than milk fat, and no product so made or prepared shall be sold, offered or exposed for sale, or possessed with the intent to sell, under any trade name or other designation of any kind. Provided however, that it shall be lawful to produce and sell a condensed or evaporated milk product in which the milk fat has been replaced by an edible vegetable fat made from soybean oil. Such a product shall be given a distinctive name to distinguish it from natural, condensed, or evaporated milk, which name shall not include the words "milk" or "milk products" or any derivative thereof, and the label under which such a product is sold at retail shall clearly state the vegetable fat content of the product.
Iowa Code § 190.6