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In addition, studies have shown that the introduction of D-tyrosine into the N-terminal or C-terminal of pentapeptide-18 can reduce the melanin content by 50% at 500 M, the tyrosinase activity by 18% at the N-terminal and by 25% at the C-terminal

Its ability to improve skin density is comparable to retinoids, which have so far remained unsurpassed in this field

With that being said, if you're combining copper peptides with a skincare regimen with vitamin C, you may want to stagger the application days or wait at least 15 minutes in between your vitamin C application to make sure you get the most from both compounds

Its reduced, not eliminated