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Exact reference ranges also vary between individual laboratories, but generally a serum vitamin B12 of under 148pmol/L or 200ng/L is thought to indicate a deficiency[2]
This effect is useful for both people with diabetes and those at risk for it, especially those who are overweight

The frequency of your B-12 injections can also be influenced by factors such as diet, lifestyle, and absorption issues
too high signals overresponse and is a contraindication to continuing
