What is the number which is listed as the first ingredient on some bottles? May 16, 2024 17:27 Updated This is a formula number, allowing us to identify which bottle contains which formula more easily. Related articles Does AlumierMD use synthetic dyes in their products? Why does my EverActive C&E™ + Peptide serum leave behind a white residue? Do AlumierMD products expire? Are the products vegan friendly? Can I combine professional treatments and home care products?