When reconstituted to 1ml, 1 unit makes a solution containing 100 mM AEBSF.HCl, 5mM bestatin, 1.5mM E-64, 2mM pepstatin A and 200uM phosphoramidon disodium salt.http://www.creative-enzymes.com/product/Protease-Inhibitor-Cocktail-VII-For-His-Tag-Sequences-DMSOFree_2763.html