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Between shorter days, limited sunlight, and the seasonal rise in Covid and other illnesses, our bodies often need a little extra support

2025;doi:10.1001/jamainternmed.2025.1109

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Low levels of B12 interfere with these pathways, often leaving people more vulnerable to mood swings, irritability, and anxious thoughts

[DOI] [PMC free article] [PubMed] [Google Scholar] 8.Long-term metformin therapy and vitamin B12 deficiency: an association to bear in mind

But high blood levels of B12 do not mean symptoms are well treated
