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Why is reconstituted GHK-Cu blue
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The copper(II) ion is coordinated by the glycine amino terminus, the deprotonated glycine to histidine peptide-bond nitrogen, and the histidine imidazole nitrogen, giving the complex its characteristic colour and stability
The clinical sweet spot for most people sits around 10 mg, with 15 mg reserved for those who plateau
Historically, peptides were first isolated in the early 20th century, with insulin being one of the most notable discovered in 1921 and later synthesized as a treatment for diabetes
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