Iowa Code § 191.6

The department may prescribe and establish standards for oleo, oleomargarine, or margarine manufactured or sold in this state and may adopt the standards set up by regulations of the food and drug administration of the United States department of health and human services, 21 C.F.R. §166.110, or any amendments thereto. Any standards so established shall not be contrary to or inconsistent with the provisions of section 190.1, subsection 6, entitled “Oleomargarine”.