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Vitamin B12 is stored in the liver where its slowly released and used by the body, being continually replenished, over time

[DOI] [PMC free article] [PubMed] [Google Scholar] Liu A, Frostegrd J

Research published in the Journal of Biological Chemistry found that GHK-Cu "significantly increased gene expression of MMP-1 and MMP-2 at the lowest concentration" tested, but this relationship becomes more complex at higher levels
Health Benefits of Glutathione 1

R., Cho, H