The Multiple Micronutrient Supplementation (MMS) Technical Advisory Group (TAG) at the New York Academy of Sciences (NYAS) and the Micronutrient Forum (MNF) convened a technical consultation to develop an open access United Nations International Multiple Micronutrient Antenatal Preparation (UNIMMAP)–MMS Product Specification for the manufacturing of this product. The specifications offered in this paper cover: ingredients, excipients, and processing aids used in the manufacturing of UNIMMAP–MMS; stability studies recommended under different testing conditions and climatic zones; packaging considerations; manufacturing standards, including pharmacopeia standards, manufacturing practices, certificates of analysis, change control, and quality agreement; finished product specifications, including tablet characterization and purity, potency assay; analytical test methods; and storage and transportation requirements.