Journal of Biomaterials Science, Polymer Edition
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(Source for lack of human PK data)
This is unusual for a named neuropeptide and it explains why the DSIP literature looks the way it does
Because the compound lacks regulatory approval, any product marketed for human use is being sold through unofficial channels that do not meet pharmaceutical manufacturing standards, raising documented concerns about purity, composition, and contamination
National Cancer Institute, Angiogenesis plays a critical role in the growth of cancer because solid tumors need a blood supply if they are to grow beyond a few millimeters in size.14 So, despite GHK-Cu's potential anti-cancer action, people who have active or suspected cancer may want to avoid the peptide.3 9 And if you develop any symptoms of cancer while using GHK-Cu, youre best off discontinuing use and contacting your doctor for their input