It is not for human or veterinary consumption and must not be used as a drug, food additive, cosmetic, or household item
Their LC method cannot possibly quantitate all potential impurities (e.g., metals, microbiological, residual organic, etc.) and most people arent walking around thinking about that
The human record is mild but uncontrolled, and the one controlled trial was underpowered
If sellers fail to show proper certificates or do not follow Amazons rules, Amazon can remove their listings
Most users notice nothing visible yet
GHK-Cu has good solubility but extremely concentrated preparations may not fully dissolve