The Protease Inhibitor Cocktail 2 MultiPurpose is supplied as a lyophilisate. Reconstitution in 1 ml of water results in a 100X stock solution. Prepare aliquots and freeze. Prevent repeated freezing / thawing. The Inhibitor Cocktail is stable for 3 years (lyophilized) if stored at -20°C or approx. 1 month if reconstituted and stored at -20°C.