Positives

• Patients using topical GHK-Cu commonly describe improved skin texture and minor wound healing, with one of the better tolerability profiles among peptides.
  
  
• A patient reported mild tingling and pinkness at first that resolved within two weeks, after which they continued without issue.
  
  

Negatives

• Patients trying injectable GHK-Cu sometimes report small bumps or pink areas at the injection site.
  
  
• Some patients with copper sensitivity describe hives or stronger reactions and have to discontinue entirely.
  
  

Hurdles & Side Effects

• Injectable GHK-Cu sits outside FDA approval; dosing errors carry a real (though rare) copper-toxicity risk that has required IV chelation in extreme cases.
  
  
• Patients describe difficulty sourcing reliably: many vendors are grey-market and product purity is inconsistent.