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Multiple studies in this and in other countries have found B12 deficiency in 10 percent to 24 percent of people 75 and older
Precautions General The validity of diagnostic vitamin B12 or folic acid blood assays could be compromised by medications, and this should be considered before relying on such tests for therapy
Warnings and Precautions Hypokalemia: B12 therapy may cause a drop in potassium levels (hypokalemia), particularly during early treatment in patients with significant B12 deficiency
For SQ injections, it also depends on where your body tends to carry more fat
PLoS ONE 9 , e92966 (2014)
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