3 links have been added on this idea.
  1. Mr N

    Scientists are already running human trials for synthetic blood. This is huge!
    https://www.cnbc.com/2022/11/07/lab-grown-blood-transfused-to-people-in-world-first-clinical-trial.html

  2. With synthetic blood, doctors won’t have to worry about blood types during transfusion, which can improve patient safety.