Good point Crazyguy2; one I shared with jws while I was still in, but only asking as a question saying I was confused about why hemoglobin-based products made with expired human blood was now a conscience matter. It pays to appear humble looking for guidance.
Especially when they can get Hemopure (cows blood ) and the GB are ok with it!
https://wol.jw.org/en/wol/d/r1/lp-e/202006400
http://ajwrb.org/watchtower-approved-blood-transfusions
https://www.ohsu.edu/sites/default/files/2019-08/Wurzburger.pdf