Frozen yogurt is a frozen dessert made with yogurt and sometimes other dairy and non-dairy products. Frozen yogurt is a frozen product containing the same basic ingredients as ice cream, but contains live bacterial cultures. Usually more tart than ice cream (the tanginess in part due to the lactic acid in the yogurt), as well as lower in fat (due to the use of milk instead of cream), it is different from ice milk and conventional soft serve. Unlike yogurt, frozen yogurt is not regulated by the U.S. Food and Drug Administration (FDA), but is regulated by some U.S. states, such as California.