There is not enough data to determine the best ROA yet However, the basic protocol would be to reconstitute the GHK-Cu utilizing bacteriostatic water and then measure out doses to either inject subcutaneously, put in a nebulizer, nasal spray or possibly sublingual. Currently, I know of only one reliable supplier. I'd say a 20 day trial would set you back about $150.
(I'm new here and very interested b/c my wife has been diagnosed with emphysema caused by toxic mold, thereafter contracting Legionaires which has left her with asthama. Its been an unlucky year for us...