feeling unwell after b12 injection Why do I feel worse a injection? Why do I feel worse
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doi: 10.1056/NEJMoa2002032 8 QinCZhouLHuZZhangSYangSTaoYet al

Vitamin B12 deficiency can result in blood, nerve, and mood disorders
"Emerging Roles of Vitamin B12 in Aging and Inflammation"

And call your doc if anything gets worse

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Semaglutide and B12 work together to support gut health
