Another consideration here is that for men, donating blood about once a year has positive health effects (see the section “Blood donation” here), so if you’re a man, it might be worth it even without the altruistic benefits.
Another consideration here is that for men, donating blood about once a year has positive health effects (see the section “Blood donation” here), so if you’re a man, it might be worth it even without the altruistic benefits.