can b12 injections make you feel unwell Why do I worse after a injection? Vitamin B12 Injection Side Effects

Sep-Oct 2003;54(5):531-9

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This occurs when serum levels are high but the B12 isnt being properly taken up by tissues

This article examines the relationship between B12 and sleep, optimal timing for supplementation, and when to seek medical advice

Evidence suggests that these effects occur because of the changes in gut bacteria and microbially induced chemical reactions