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"In the case of fermentation-based active substances, which consist of more than one active moiety, the impurity profile is usually very complex and the thresholds in the ICH Q3A and Q3B cannot be considered applicable," said Xellia

Ive worked with hundreds of people using GHK-Cu (glycyl-L-histidyl-L-lysine-copper) over the past decade, and the results are legitimate, measurable, and backed by solid mechanistic sciencebut you MUST understand what youre actually doing and why most people are using it improperly

HPLC can show the relative size of detected chromatographic peaks, but HPLC area percentage alone does not confirm the chemical identity or account for every possible impurity

Here is how a provider decides which one fits, and where peptides genuinely help versus where they are oversold