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
2014, 2014, p
These trials tracked numerous safety parameters and laboratory values, but vitamin b12 levels were not routinely monitored or reported in the published results
For Optimal Results: Follow up with a moisturizer to lock in hydration after cleansing