However, as reassuring as all of this is, there are a couple of things to remain mindful of: Copper toxicity Because GHK-Cu contains copper, it does pose a potential risk of copper toxicity,12 the symptoms of which include abdominal pain, vomiting, chest pain, chills, cough, fever, general weakness, anemia, burning sensations, tremors, and a metallic taste in the mouth.13 The risk is small, as the concentrations of copper in the peptide are typically well within safe parameters, but its good to be aware of it
Exposure to heat, moisture, or light accelerates degradation
If there is no natural hardness, iron, or manganese then this would be an excellent choice
doi:10.2174/138161211796197179
However, persistent symptoms lasting more than 2 weeks warrant professional evaluation to rule out underlying conditions