I've got 100 grams of GHK-Cu copper peptide in my fridge right now from activepeptide.com. It's nice high quality stuff but very expensive from that retailer. It's the second most expensive compound I've bought after darolutamide. However, I would recommend it if you're planning on trying a copper peptide.
The main difference with activepeptide's GHK-Cu is that it comes in a nice crystalline form. I previously got some GHK-Cu from Kane (Anagen) back when he offered it. Kane's GHK-Cu came as a powder that gradually absorbed water from the air and turned into a horrible unusable gel after a week or too. This is common of many "lower grade" formulations of GHK-Cu. It has to do with how they're synthesized.
I don't use GHK-Cu for my hair anymore as I believe GHK-Cu reacts with minoxidil in solution causing precipitation of one or both. The color of the mixture changes when GHK-Cu and minoxidil are combined and
something certainly seems to precipitate out of solution.
This is GHK-Cu:
View attachment 71229
This is minoxidil:
View attachment 71230
I think what's happening is the Cu2+ from the GHK-Cu is breaking off and binding to the O- from the minoxidil causing a "copper salt minoxidil" to come out of solution, but I don't know for sure.
Either way, I never noticed dramatic or any significant hair gains from GHK-Cu.
I now use my GHK-Cu solely as a facial product in a water-based serum composed of GHK-Cu 2% & niacinamide 5%. It works really nicely on my skin. It has what appears to be a very pro-collagen, anti-acne, and anti-wrinkle effect.
I will likely re-add it to my hair formulations once I eventually drop minoxidil, as it may provide a small benefit. I am aiming to get off minoxidil eventually as for me it is absolutely horrible on facial skin with prolonged use. Minoxidil inhibits collagen production, worsens the quality of my skin, and causes eye bags.
Minoxidil might be something you will want to get off eventually as well for this reason, once you figure out a root solution to your hair problem.