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Description
Users often report increased energy and mental clarity within the first week a direct result of enhanced cellular metabolism

In addition to limited absorption via the IF, the intake of high-dose supplements leads to passive diffusion, i.e., the vitamin can freely enter the bloodstream without IF binding and receptor uptake

There are two hypotheses

This means that it is not possible to overdose on vitamin B12, and as far as we know there is no upper limit on the amount of B12 that can be taken safely by an otherwise healthy person
