Comparing GHK-Cu sources - purity matters

Thanks for sharing. I had a slightly different experience but your protocol is solid. One thing I would add is the importance of consistent timing.

Thanks for sharing. I had a slightly different experience but your protocol is solid. One thing I would add is the importance of consistent timing.

Thanks for sharing. I had a slightly different experience but your protocol is solid. One thing I would add is the importance of consistent timing.

Thanks for sharing. I had a slightly different experience but your protocol is solid. One thing I would add is the importance of consistent timing.

Purity absolutely matters. I wasted 3 months on a low-quality GHK-Cu that turned out to be less than 90% pure when a friend got it tested. Switched to a source with third-party COA from a reputable lab and saw results within weeks. Always ask for certificates of analysis.

The copper tripeptide is particularly sensitive to degradation. I have noticed that storage conditions matter almost as much as initial purity. Lyophilized powder keeps well but once reconstituted, I would not use it past 2 weeks in the fridge. Has anyone tested stability beyond that?

For topical use specifically, the formulation vehicle matters a lot too. GHK-Cu needs to actually penetrate the skin barrier to work. I had much better results with a professional compounding pharmacy formulation vs trying to make my own from powder.

To add to the purity discussion - look for sources that provide HPLC testing, not just mass spec. HPLC gives you better information about related impurities and degradation products. Mass spec confirms molecular weight but misses a lot.