Biological preparations comprising extracellular vesicles known as exosomes for therapeutic applications for the treatment of neurological and physiological disorders, namely, cancer, immune-based diseases, metabolic and fibrotic disorders, infectious diseases, and rare diseases; biological preparations comprising extracellular vesicles known as exosomes for use in the manufacture of pharmaceuticals in the areas of oncology, immune-based diseases, metabolic and fibrotic disorders, neurologica...