An in vitro culture medium for embryos consisting of IVF culture medium additionally containing G-CSF at a concentration of at least 0.5 ng/ml, preferably between 1.0 and 5.0 ng/ml, is described; a method for in vitro embryo culture, comprising the steps of incubating a plurality of embryos in an in vitro culture medium consisting of IVF culture medium additionally containing G-CSF at a concentration of at least 0.5 ng/ml and growing such embryos until the 8-cell stage is reached is also described.