N.M. Stat. § 25-5-2
It shall be unlawful for any person to manufacture, mix, compound, sell or offer for sale, for human consumption in this state, flour (as defined in Section 1 [25-5-1 NMSA 1978]) unless the following vitamins and minerals are contained in each pound of such flour: not less than two milligrams and not more than two and one-half milligrams of thiamine; not less than one and two-tenths milligrams and not more than one and one-half milligrams of riboflavin; not less than sixteen milligrams and not more than twenty milligrams of niacin or niacin-amide; not less than thirteen milligrams and not more than sixteen and one-half milligrams of iron (Fe); except in the case of self-rising flour which in addition to the above ingredients shall contain not less than five hundred milligrams and not more than fifteen hundred milligrams of calcium (Ca); provided, however, that the terms of this section shall not apply to flour sold to distributors, bakers or other processors, if the purchaser furnishes to the seller a certificate in such form as the board shall by regulation prescribe, certifying that such flour will be (1) resold to a distributor, baker or other processor, or (2) used in the manufacture, mixing or compounding of flour, white bread or rolls enriched to meet the requirements of this act [25-5-1 to 25-5-9 NMSA 1978] or (3) used in the manufacture of products other than flour, white bread or rolls. It shall be unlawful for any such purchaser so furnishing any such certificate to use or resell the flour so purchased in any manner other than as prescribed in this section.
NMS § 25-5-2