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Whether you have a deficiency or you simply want to make certain that you're eating a well-rounded diet, there are many foods that contain vitamin B12
What dose should I choose
The two cysteine residues (positions 7 and 14) form an intramolecular disulfide bond that constrains the molecule into a small loop, mirroring the corresponding region of native human growth hormone (residues 177191) with an N-terminal Tyr added for synthesis and labeling reasons
However, B12 supplementation will only help if youre actually deficient
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