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? Do AlumierMD products expire? What’s the difference between AlumierMD products and products sold at drugstores? Where are AlumierMD products manufactured? What is your return policy?