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The best way to correct a deficiency of Vitamin B12 is through a Vitamin/Nutrient IV that contains vitamin B12 and/or via vitamin B12 injections
[7] Niacin can cause vasodilation, so it should be avoided in those with serious hypotension
The frequency depends on your deficiency
A lot-matched certificate of analysis can add context, but it does not prove that a product is safe for people
Berlin H, Berlin R, Brante G (1968) Oral treatment of pernicious anemia with high doses of vitamin B12 without intrinsic factor
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