I want to make up a serum but I can't find much clear information about what concentration gives the best results.
I see some sellers are recommending a 2% solution but they never give any links to research to back up that claim.
Basically all the research I have read over the last few days shows that GHK-CU works best at the nanomolar scale.
This study for instance shows the best results with a 0.01 Nanomole/ml concentration which is around 0.004mcg/ml.
Another study found best results at 1nM concentration but not much different to the 0.01nM or 100nM:
Am I missing something here or can I make up a 2 Liter bottle of serum using 1mg of GHK-CU and that would still be 100 times more concentrated than the 0.01nM mixture mentioned above?
Or ad 1mg into a 200 Liter tub and bathe in it???
