Abstract: A method of producing the constituents of a therapeutic product from mammalian cells is described herein. Cells are isolated from a mammalian source. The cells are exposed to supercritical carbon dioxide (SCCO2) for 1 to 30 minutes, where the SCCO2 is maintained at a pressure of 1071 pounds per square inch (PSI) and a temperature of 31.1 to 45 degrees Celsius during the exposure. The exposure dissociates the cellular membranes of the cells to release intramembrane components therein to produce constituents of the therapeutic product. The mammalian cells may include at least one of platelets, stem cells, germ cells, and somatic cells. The methods described herein are particularly advantageous for releasing and capturing therapeutic intramembrane components from platelets and alpha-granules.