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Sources Food sources Only certain bacteria and archaea can synthesize vitamin B 12 (123, 124)
Improved Absorption Vitamin B12 injections bypass the digestive system entirely, which allows the vitamin to be directly absorbed into the bloodstream
[74] Fruit and iron were also part of the diet, and it appears that at this point, Minot and Murphy were not quite sure that the liver was a very important factor
Injecting the medication should proceed slowly and steadily
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