Provided herein are methods for the cryopreservation of stem cells and/or progenitor cells, comprising the steps of (a) contacting stem cells and/or progenitor cells with a cryopreservation medium, said cryopreservation medium comprising between 4 v/v% and 25 v/v% of propylene glycol and between 1.0 w% and 10 w% of a sugar and (b) slow-freezing said cells, thereby obtaining a frozen composition comprising said cells and said cryopreservation medium.
