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Such difference is unknown in neonatal mice and rats

You can buy vitamin pills off the counter without a doctors supervision or prescription

Lactating women require 2.0 mcg daily to ensure adequate B12 in breast milk

Once a depleted system gets the B12 it needs it may start using that B12 in processes that require other vitamins and minerals, in this way the B12 injection can leave you depleted in other vitamins and minerals

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