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Vitamin B12 supports several important functions in the body, including: DNA synthesis Red blood cell production Nervous system function Myelin production, which helps protect nerves Energy metabolism Vitamin B12 absorption becomes more difficult with age because the body may produce less intrinsic factor, a stomach protein required for proper absorption

It does not replace the official medication guide, patient information leaflet, counseling from your pharmacist, or medical advice from your prescriber

Patent applications on the work described in this paper may be filed by Johns Hopkins University

To view a copy of this licence, visit About this article Cite this article Zhang, Z., Gao, J., Jia, L

He has said their cells were indistinguishable from the younger mice