What is the number which is listed as the first ingredient on some bottles? September 21, 2020 19:31 Updated This is a formula number, allowing us to more easily identify which bottle contains which formula. Related articles Do you use dimethicone in your products? Does AlumierMD use parabens or sulfates in their products? Do AlumierMD products expire? What is “angel dusting”? What clinical testing was performed on AlumierMD products?