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Furthermore, a doctor knows what signs to look for to show that you have vitamin B12 deficiency, so that you only get the dose you need
Do not assume these supplies are included unless the item description specifically says so
Swadling L, Maini MK, Can T
Once injected, B12 enters the bloodstream directly without requiring stomach acid, intrinsic factor (a protein necessary for B12 absorption), or healthy intestinal function
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