Abstract: A mobile treatment apparatus for use in treating a user of the apparatus with medical or therapeutic gases, comprising a mixing unit for containing water and having a motionless mixing means; a gas cartridge unit removably mounted to the mixing unit via a cartridge piercing module, wherein a pressure-regulating valve regulates a flow rate of a gas from the cartridge through the mixing means, to achieve a specified gas-water mixture that is effective for transdermal delivery of the gas to the user; and a wearable receiver suit for forming a space around at least an area of the user's body to be treated, wherein the suit is connected to the mixing unit, for delivery of the gas to treat the area via the transdermal delivery.