5 Pharmaceutical preparations and substances for the treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies being mitochondrial disease, joint strain and tears, ligament strain and tears, muscle atrophy, muscular dystrophy, neuromuscular diseases, neurological disorders, neurodegenerative disorders, inflammatory disorders, infectious diseases, genetic diseases, rare diseases, in-born errors of metabolism (IEMs), lysosomal storage disorders, urea cycle disorders, liver disorders and diseases, brain diseases, eye disorders and diseases and lung disorders and diseases; pharmaceutical preparations, namely, a drug delivery system comprising genetically engineered or purified exosomes in the form of a liquid solution or lyophilised preparation for therapeutic use for the treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies being mitochondrial disease, joint strain and tears, ligament strain and tears, muscle atrophy, muscular dystrophy, neuromuscular diseases, neurological disorders, neurodegenerative disorders, inflammatory disorders, infectious diseases, genetic diseases, rare diseases, in-born errors of metabolism (IEMs), lysosomal storage disorders, urea cycle disorders, liver disorders and diseases, brain diseases, eye disorders and diseases and lung disorders and diseases; pharmaceutical preparations, namely, exosomes to deliver protein or nucleic acids or viral vectors for genetic therapy; medicine for the treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies being mitochondrial disease, joint strain and tears, ligament strain and tears, muscle atrophy, muscular dystrophy, neuromuscular diseases, neurological disorders, neurodegenerative disorders, inflammatory disorders, infectious diseases, genetic diseases, rare diseases, in-born errors of metabolism (IEMs), lysosomal storage disorders, urea cycle disorders, liver disorders and diseases, brain diseases, eye disorders and diseases and lung disorders and diseases; Medical preparations for the treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies being mitochondrial disease, joint strain and tears, ligament strain and tears, muscle atrophy, muscular dystrophy, neuromuscular diseases, neurological disorders, neurodegenerative disorders, inflammatory disorders, infectious diseases, genetic diseases, rare diseases, in-born errors of metabolism (IEMs), lysosomal storage disorders, urea cycle disorders, liver disorders and diseases, brain diseases, eye disorders and diseases and lung disorders and diseases; biological preparations for medical purposes for the treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies being mitochondrial disease, joint strain and tears, ligament strain and tears, muscle atrophy, muscular dystrophy, neuromuscular diseases, neurological disorders, neurodegenerative disorders, inflammatory disorders, infectious diseases, genetic diseases, rare diseases, in-born errors of metabolism (IEMs), lysosomal storage disorders, urea cycle disorders, liver disorders and diseases, brain diseases, eye disorders and diseases and lung disorders and diseases; biological preparations for the treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies being mitochondrial disease, joint strain and tears, ligament strain and tears, muscle atrophy, muscular dystrophy, neuromuscular diseases, neurological disorders, neurodegenerative disorders, inflammatory disorders, infectious diseases, genetic diseases, rare diseases, in-born errors of metabolism (IEMs), lysosomal storage disorders and urea cycle disorders; biological preparations comprising exosome for the treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies being mitochondrial disease, joint strain and tears, ligament strain and tears, muscle atrophy, muscular dystrophy, neuromuscular diseases, neurological disorders, neurodegenerative disorders, inflammatory disorders, infectious diseases, genetic diseases, rare diseases, in-born errors of metabolism (IEMs), lysosomal storage disorders, urea cycle disorders, liver disorders and diseases, brain diseases, eye disorders and diseases and lung disorders and diseases; biological preparations comprising a therapeutic target protein-loaded, nucleic acid-loaded or virus-loaded exosome for the treatment of genetic diseases, respiratory diseases, or cancer; biological reagents for medical use; biological preparations for medical purposes, namely, for the prevention and treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies being mitochondrial disease, joint strain and tears, ligament strain and tears, muscle atrophy, muscular dystrophy, neuromuscular diseases, neurological disorders, neurodegenerative disorders, inflammatory disorders, infectious diseases, genetic diseases, rare diseases, in-born errors of metabolism (IEMs), lysosomal storage disorders, urea cycle disorders, liver disorders and diseases, brain diseases, eye disorders and diseases and lung disorders and diseases; mixed biological preparations for the prevention and treatment of infectious diseases; pharmaceuticals, medicines, biologics, biotherapeutics, biosimilars and therapeutics, namely, EV-based nucleic acid therapeutic agents for the prevention and treatment of infections or disease; diagnostic kits comprised of medical diagnostic reagents and assays for testing of bodily fluids for use in disease detection; diagnostic kits comprised of medical diagnostic reagents and assays that test for the presence of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies being mitochondrial disease, joint/ligament strain/tears, muscle atrophy, muscular dystrophy, neuromuscular diseases, neurological disorders, neurodegenerative disorders, inflammatory disorders, infectious diseases, genetic diseases, rare diseases, in-born errors of metabolism (IEMs), lysosomal storage disorders and urea cycle disorders