Injectable GHK-Cu carries more risk , particularly for copper accumulation, if you have underlying conditions affecting copper metabolism (like Wilsons disease or chronic liver disease)
a number of the agonists in Table 1 (Families 2-5) have norleucine at R 1 , or an amino acid residue a number of an amino acid residues may be used at residue R 1 , including without limitation, tyrosine, phenylalanine, aspartic acid, arginine, isoleucine, serine, histidine, glycine, cysteine, methionine, tryptophan, norvaline, ornithine, S-benzyl cysteine amino acid residues
Default to conditions required by the least stable component
doi: 10.1210/en.2013-1133 38 TangheSVan SoomANauwynckHCorynMde KruifA
The most common side effect is some soreness at the injection site, and you might notice your urine turning bright yellow (thats just the excess vitamins, particularly riboflavin, being excreted)
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