Disclosed are methods, compositions of matter, and protocols useful for the induction of a therapeutic immune modulatory response through administration of exosomes derived from a stem cell source. In one embodiment, said stem cell source is endometrial regenerative cells. Specifically, in one embodiment stem cell derived exosomes are used as a method of treating an autoimmune condition such as rheumatoid arthritis, multiple sclerosis, or systemic lupus erythromatosis.