covid vaccine and b12 injection Common Questions About Bivalent COVID-19 Boosters | Johns Hopkins Long COVID and Pernicious Anaemia

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This can be problematic for people with certain health conditions or older adults whose digestive efficiency may be compromised

doi: 10.1016/j.tcb.2020.04.004

The studies were done on rodents, the b12 isnt available in the kidneys for very long, weeks, not months it seems.and whether humans with b12 deficiency because of a broken system can access this b12 we wont know without further research