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The Recommended Dietary Intake (RDI) of vitamin B12 varies based on age, health conditions, and lifestyle factors

The influence of polymorphisms of glutathione S -transferases M1 and M3 on the development of human urothelial cancer

Your body has a limited capacity for B12 absorption

Chest 158, 18331834

There is no reliable timeline, because the human data does not exist

But its not the only use
