I've used EdU in a trial of several proliferation assays including BrdU, CellTrace, and a few others. We cultured cells in both RPMI 1640 and DMEM and found that the media made little difference. Our standard RPMI contained 25 mM HEPES, 10% FCS, 1% NEAA, 5x105 mM b2-mercaptoethanol, 100Uml1 penicillin, and 100 ugml1 streptomycin. We settled in 2x105 cells per well in a 96 well format.