Once the cells are frozen and stored at cryogenic temperatures, scientists have determined that all cell activity stops. With no molecular movement there is no potential for further damage, which means the cells can be stored for extended periods of time without compromising their integrity.

Currently there is no use-by date for cord blood stem cells. Published research suggests that after 23 years of cryopreservation, cord blood stem cells show no degeneration. Comparatively, bone marrow and other human tissues and cells have been stored for decades and have remained viable. There is no reason to believe that the same would not be true for cord blood and tissue stem cells.