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CL Answer What are the side effects of magnesium supplements
Effect of physiological doses of oral vitamin B12 on plasma homocysteine: a randomized, placebo-controlled, double-blind trial in India
The bigger risk is contamination if the needle has touched anything other than the inside of the vial
Even if your lab values say you are normal, your body still may be needing more as lab accuracy for vitamin B12 is highly debated
Keep in mind, though, that impaired kidney function may impact how much vitamin B12 you will want to take
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