In its raw, most stable form, its a lyophilized powder
[GHK-Cu Copper Peptide Serum product page] THD-C Vitamin C Serum - oil-soluble THD ascorbate in an olive squalane base, at concentrations from 10% to 30%
The second is subcutaneous NAD+
Yes, peptides can generally be used with retinol in skincare routines
So Where Does GHK-Cu Stand
As a practical guideline for the peptides most commonly prescribed at Perfect B: BPC-157: 12 to 18 months refrigerated, 2 or more years frozen CJC-1295/Ipamorelin: 18 to 24 months refrigerated, 2 or more years frozen TB-500: 18 to 24 months refrigerated, 2 or more years frozen GHK-Cu: 12 to 18 months refrigerated (particularly light-sensitive, keep in original dark vial) MOTS-c: 18 to 24 months refrigerated, 2 or more years frozen Epithalon: 18 to 24 months refrigerated, 2 or more years frozen Semax: 12 to 18 months refrigerated How to Reconstitute Peptides Correctly Reconstitution is the step where most storage problems begin