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So long as your blood sugar is stable and youre well hydrated you will be set to go

For others, it may take 23 days, especially if they were significantly deficient
J Biol Chem 253:27692776 Rom WN, Basset P, Fells GA et al (1988) Alveolar macrophages release an insulin-like growth factor I-type molecule
Vitamin B12 Absorption The absorption of vitamin B12 is slightly more complicated than other vitamins due to its dependence on a protein called intrinsic factor
J Immunol