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21 days agoThere is a fair indication that old cells can be bad for you which is why some cells that encourage the self destruct mechanic get studied for aging. Donating basically kicks your body into making new blood so it likely has a good effect in that way.
if your bleeding out and going into surgery the blood will help more than harm. down the road when you are all tip top you could always give blood yourself. Its a one mans trash is another mans treasure situation.