Another concern is that, even if your niyyat to donate blood is good, but if the blood that you donated is transfused to a bad man and caused him to be well and continue doing bad things, then your deed of donating blood is counted as haram.
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It is a good deed even if a non Muslim benefits from it. No one of the donners will be sinful for that.

Can you clarify the issue of blood donation? We are having problems in convincing the Muslim populace especially the youth to donate blood. One obstacle we are facing is the notion that they have – the blood a Muslim donates should go only to a Muslim

Medicine and medical treatments | March 5, 2014 12:34 pm
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I suffer from chronic muscular and joint pain. Although I take medication, a health professional mentioned to me that alcohol can help alleviate symptoms. Although I’m generally always in sort of pain but some days it varies from being mild,
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Does Islam allow hair loss treatment in the form of taking tablets and moisturisers (for men or women) to restore hair growth? (In our family, men and women are suffering with extreme hair loss, alhamdulillah)