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That is why so many people researching subcutaneous GHK-Cu see skin benefits as the main prize and why it appears on every serious peptides for skin list

Common contaminants include bacterial endotoxins capable of triggering immune reactions, incomplete peptide chains from synthesis errors, residual solvents including trifluoroacetic acid, heavy metals, and microbial contamination from non-sterile handling

PubMed Link Vasiljevic D, et al

Most of this evidence is microarray and bioinformatics, not a demonstration that tired cells were rescued

In rare cases, it may cause dizziness, headache, or gastrointestinal discomfort