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C-peptide levels are measured instead of insulin levels because C-peptide can assess a person's own insulin secretion even if they receive insulin injections, and because the liver metabolizes a large and variable amount of insulin secreted into the portal vein but does not metabolize C-peptide, meaning blood C-peptide may be a better measure of portal insulin secretion than insulin itself

Safety information: Avoid contact with eyes

Body Weight Heavier individuals generally require higher absolute doses to achieve the same serum concentration

Both compounds are available from reputable research suppliers with certificates of analysis confirming purity always verify supplier COA documentation before initiating any Matrixyl vs GHK-Cu comparative study to ensure compound integrity and experimental reproducibility