How should I store my purified collagenase?

This product is stable for at least two years from date of manufacture if stored unopened between -15 to – 25°C.
Internal studies have shown the reconstituted enzyme is stable as a frozen solution between -15 to – 25°C for at least 1 year as long as no other protease enzymes had been added to the solution. Additional studies have shown the reconstituted collagenase was successfully frozen and thawed three times as a concentrated or dilute solution without apparent loss of potency as assessed by the CDA assay. The product is shipped on Enviro Ice packs to provide the most stable conditions during shipment.