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 Does AlumierMD use parabens or sulfates in their products? How long will my products last? What clinical testing was performed on AlumierMD products? What’s the difference between AlumierMD products and products sold at drugstores? Why is there so much packaging for the products?