Hwang S, Mruk K, Rahighi S, Raub AG, Chen CH, Dorn LE, et al
In one mouse study, researchers found that the peptide reduced the pain felt by the animals in their paws when placed on a mildly hot plate. The authors explained that this could be because GHK is similar in structure to cimetidine, a histamine H2 receptor antagonist sometimes given to reduce pain in certain digestive conditions.3 10 In rodents, doses as low as 0.5mg/kg were found to be effective in delivering these anti-pain effects.25 In a 70kg human, an equivalent dose would be around 5.6mg, though thats likely higher than necessary: pharmaceutical-grade GHK-Cu normally ranges from 0.5 mg to 2.5mg per injection
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Whether the intact GHK-Cu complex, the free peptide, the copper alone, or some mixture predominates in blood after subcutaneous dosing has not been resolved for this compound in controlled studies