b12 injections hypothyroidism Could Vitamin B-12 Help Your Symptoms? Feeling tired, foggy, or run-down?
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[DOI] [PMC free article] [PubMed] [Google Scholar] 289.Hughes, R
Improvements in symptoms related to vitamin deficiencies may start appearing within a few days or weeks after starting the injections

Birch, Nicola E

Can I switch forms if my labs improve but symptoms persist
