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The original was posted on /r/science by /u/CUAnschutzMed on 2025-09-05 17:05:10+00:00.
Original Title: A new study has found that caffeine, the world’s most consumed psychoactive substance, may impair the quality of donated blood and reduce the effectiveness of transfusions – especially in recipients whose red blood cell metabolism is influenced by a common genetic variant.
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