What is the number which is listed as the first ingredient on some bottles? September 21, 2020 19:34 This is a formula number, allowing us to more easily identify which bottle contains which formula. Related articles What is “Angel Dusting”? How long will my products last? What clinical testing was performed on AlumierMD products? Does AlumierMD use parabens or sulfates in their products? What can I expect right after a chemical peel?