The CryoStor series of cell-specific, optimized freeze media, is designed to prepare and preserve cells in ultra low temperature environments (-70ºC to -196ºC). Cryostor CS5 Freeze Media, pre-formulated with 5% DMSO, provides a safe, protective environment during the freezing, storage, and thawing process for cells and tissues with a requirement for 5% DMSO. Through modulating the molecular-biological response to the cryopreservation process, CryoStor provides for enhanced cell viability and functionality while eliminating the need for serum, proteins or high levels of cytotoxic agents.