Posted on February 17, 2021July 3, 2021 by COSMEDICIAN ADMINWhat is an EXOSOME? (Video) The main ingredient of EXOMIDE, Human Adipose Derived Mesenchymal cell exosomes (hereinafter “exosome”), is a very small Nano-sized natural transporter extracted from stem cells. The size is only about 1/1000th the thickness of human hair, but it’s full of various elements in skin cells as protein, nucleic acids, lipids and etc.