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Injections : Often necessary for severe deficiencies, injections deliver B12 directly to the body and offer longer-lasting benefits
The vial lasts long enough at these low doses that stability is never a concern within the 28-day window
Tissue slices were stained overnight with primary antisera (Supplementary Table 1) before incubation with appropriate secondary antisera (Supplementary Table 1)
by age 60, levels drop to around 80 ng/mL
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