Lyophilized hCG although stable at room temperature for 3 weeks, should be stored desiccated below -18^°C. Upon reconstitution CG-beta should be stored at 4^°C between 2-7 days and for future use below -18^°C. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA).Please prevent freeze-thaw cycles.