do b12 injections affect b12 levels Are Vitamin Shots Right for You? Sublingual B12 vs. B12 Injections:
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(2014) Serum Nutritional Biomarkers and Their Associations with Sleep among US Adults in Recent National Surveys
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however, because of the special identification method, not all samples were screened for hCG (Table 2)
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An elevated methylmalonic acid (MMA) level has been thought to be the most direct, metabolic indicator of B12 deficiency because B12 is the only cofactor required by the enzyme that degrades MMA
