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A body might react adversely to B12 shots for a variety of reasons
Normal psychological function
Blood test markers to discuss with a clinician Marker CBC with differential Why it matters Screens anemia, infection patterns, and general blood-cell context before interpreting fatigue changes
"That doesn't mean the medications are necessarily causing these symptoms, but it could suggest that reports of menstrual changes and body temperature fluctuations are worth studying more systematically." Researchers Hope to Expand Beyond Reddit The team hopes the findings encourage scientists and healthcare providers to pay closer attention to the kinds of side effects patients are discussing online
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