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In addition, supplements can be made from animal by-products (for example, bones, hoofs, tendons) and some may contain viruses (for example, mad cow disease) and others have had high concentrations of toxic metals found in the preparation

In the GHK-Cu complex, the Cu (II) ion is coordinated by the nitrogen from the imidazole side chain of the histidine, another nitrogen from the alpha-amino group of glycine, and the deprotonated amide nitrogen of the glycine-histidine peptide bond (Figure 1)

doi: 10.1038/s41598-023-38696-4 107 LindahlSShiehMZhangTGuoCRobinsonJRSawaTet al

Key Takeaways Vitamin B12 is essential for various bodily functions