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Intramuscular (IM) vitamin injections bypass the gastrointestinal system entirely, achieving 70 to 80% greater bioavailability than oral supplementation

If your B12 level is found to be below normal, replacing that vitamin B12 is very important, explains family physician Kenneth Goodman, MD

A 2020 study of epigenetic patterns in 1,600 adult participants found that those with low vitamin D levels were biologically older than those with adequate levels (2)

That approach keeps shelf-life decisions simple, documented, and consistent

I suppose it could be that the jabs are making me tired and that coupled with other factors (Christmas, family, stress of a new medical condition etc) is what is triggering them now