is lecithin and the concentration is about 0 15 w v to about 0 4 w v the organic solvent is chloroform in step 220 the first aqueous solution and the organic solution are mixed so the chitosan and the phospholipid self assemble to form an aqueous micelle or a plurality of aqueous micelles dispersed in the lipid for forming the first emulsion of a water in oil type the drug is enclosed within the aqueous micelles in step 230 the first emulsion is added to the second aqueous solution and the first emulsion is dispersed uniformly in the second aqueous solution to form the second emulsion of a water in oil in water type the above second emulsion contains an emulsifier in an embodiment the emulsifier is a sodium cholate aqueous solution and the concentration of the sodium cholate aqueous solution is preferably about 1 w v a mixing method in the above step 220 and step 230 is using an ultrasonic processor in step 240 the organic solvent within the second emulsion is removed to obtain a plurality of oral drug carriers dispersed uniformly in the second aqueous solution in an embodiment the method of removing the organic solvent is using a rotary vacuum evaporator after step 240 further comprising a step of removing water from he second emulsion to obtain an oral drug carrier in powder formulations by freeze drying method a solution having an oral drug carrier is dispensed to centrifuge tubes and placed them in freeze drying bottles adding appropriate amount of liquid nitrogen to the freeze drying bottles making the solution freeze into a solid then the.