It takes between 7 to 10 working days for US customers, and between 3 and 5 working days for customers in Europe
It is important however, to know what disease process may be contributing to a B12 deficiency and to follow the correct dosing protocol for oral or injectable B12 supplementation
Your body doesnt make vitamin B12 on its own
Elevated B12 is more commonly caused by myeloproliferative disorders, certain cancers, renal failure, or excessive supplementation
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Doses beyond that threshold produced no additional benefit but increased cost per injection cycle by 300%