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It also has a tyrosine residue to replace the first amino acid at the N-terminus, which researchers consider to help increase the stability of the peptide

This places them at elevated risk for B12 deficiency, and standard oral supplementation may not provide adequate absorption

If you are B12-deficient, your doctor will determine how much of the vitamin you need to take

It is involved in nearly every system that keeps you feeling alert, focused, and physically capable

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Most investigators specialized in endocrinology and internal medicine, with others specializing in family medicine, psychiatry and clinical psychology