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Description
This absorption explains the mechanism underlying oral and nasal treatment of vitamin B12 deficiencies
Clin Proteomics

GHK-Cu (glycyl-L-histidyl-L-lysine-copper) is a naturally occurring tripeptide your body produces, but levels drop sharply with age, from roughly 200 ng/mL at age 20 to about 80 ng/mL by age 60

Data availability The authors declare that all data supporting the findings of this study are available within the paper and its supplementary information
