I don't know of any side effects at the dosages typically used which are 1 to 7 mgs daily. In one kilogram amounts, GHK-Cu costs about $10 a gram or $0.10 per milligram. But we have been under FDA pressure for years about the copper peptides and can say little. We cannot say what all the other sellers of copper peptides say about the actions of copper peptides. I have been told many times by FDA people that we have too much science. SuperSmart sells a sublingual form of 5 mgs GHK-Cu but, while I wish them well, we are not part of that company.
A woman came to Skin Biology recently who had serious damage to her C6 neck spinal segment and spent her days for three years in bed with pain. Under her physician's direction, she used GHK-Cu. After two months of injecting 7 mgs subcutaneously near the C6 area, she has no pain, the swelling is greatly reduced, and she out-of-bed and can do most physical exercises. She gave me a big hug.
A man with COPD said use of sublingual GHK-Cu helped his breathing.
But illnesses generate income for big pharma. I am not against business but the current pricing of drugs in the USA is almost criminal.
Also, the National Institutes of Health (NIH) is hopeless. My last grant application to NIH for GHK studies was disapproved as "of no medical value".
My goal is to publish our studies of the potential medical uses of GHK based on analyzing the huge amount of gene expression data given to us by the Broad Institute in Cambridge, MA. We are putting links to GHK research into our website at reverseagingwithGHK.com. They are on the left side of the screen about three screens down. We have been focusing lately on GHK's many anti-cancer actions. We just submitted a new paper; "The human tripeptide GHK induces strong anti-neoplastic gene expression in human breast cancer MCF7 and prostate cancer PC3 cells".