The sorption and subsequent desorption of 4He gas by grapheme oxide (GO) and hydrazine-reduced grapheme oxide (RGO-Hz) powders have been investigated in the temperature interval 2 – 25 K. It is found that the Hz-reduction of GO increases the sorptive capacitance of RGO-Hz by a factor of 3.3 in comparison with GO. It is assumed that the sorptive capacity of the RGO-Hz sample increases because the O2-containing groups are removed in the process of Hz-reduction of GO, which makes the interlayer space accessible for sorption