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Unlike pills or injections that need to go through your digestive system, B12 shots bypass this process and start working right away
B12 injections work quickly and typically show noticeable effects within 48 to 72 hours
Do not take Vitamin B12 Injection if you: Are allergic to Vitamin B12, cobalt, or any other ingredients in the tablets Have hereditary optic atrophy (loss of some or most of the nerve fibers in the optic nerve) Vitamin B12 Tablets should not be used in newborns
If only 0.20.5mg reaches the dermis topically, then direct subcutaneous injection at 0.751.5mg theoretically delivers 37 the bioavailable dose
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