What is the number which is listed as the first ingredient on some bottles? September 21, 2020 19:36 This is a formula number, allowing us to more easily identify which bottle contains which formula. Related articles Does AlumierMD use synthetic dyes in their products? What is “angel dusting”? Are the products vegan friendly? What’s the difference between AlumierMD products and products sold at drugstores? Do AlumierMD products expire?