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However, it's important to contextualize this assessment within the limitations of the available evidence: most safety data comes from relatively small studies, often of short-to-moderate duration, conducted primarily in the Soviet Union, Russia, and Eastern Europe where methodological standards and reporting practices have sometimes differed from Western pharmaceutical trial requirements

On the topical side, the most well-known study used a nano-lipid carrier to help GHK-Cu sink deeper into the skin

So, I think what you just described that there

The list below comes from rodent toxicity data and from research community use reports