The modern version of this is called Therapeutic Plasma Exchange (TPE) or Plasmapheresis and it is used to treat a variety of conditions including cancer and au

The modern version of this is called Therapeutic Plasma Exchange (TPE) or Plasmapheresis and it is used to treat a variety of conditions including cancer and autoimmune: https://my.clevelandclinic.org/health/treatments/24197-plasmapheresis-plasma-exchange https://my.clevelandclinic.org/health/treatments/24197-plasm... There are also claims that it improves dementia / Alzheimer's symptoms and popular "longevity biomarkers".