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Signs of Anemia Anemia is a common sign of vitamin B12 deficiency
Because the peptide occurs naturally in human plasma (at roughly 200 ng/mL in young adults, declining to approximately 80 ng/mL by age 60), topical supplementation essentially restores youthful local concentrations in treated skin
It is synthesized in every cell from the amino acids glutamate, cysteine, and glycine (Lu, Biochimica et Biophysica Acta , 2013)
Mateescu DM, Gavrilescu DM, Constantinescu FE, et al
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