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Allies of Skin Copper Tripeptide & Ectoin Advanced Repair Serum pricing This serum is, by far, the most expensive option of our top picks, but Allies of Skin does offer one of the best subscription discounts among the products in this guide
Avoid combining it directly with vitamin C or highly acidic products, which may destabilize the peptide
Avoid simultaneous use with strong acids or chelators (e.g., vitamin C or retinol serums) because they can inactivate copper peptides
As humans age, their natural levels of GHK decline, going from around 200ng/mL in the plasma of a 20-year-old to 80ng/mL in a 60-year-old
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