The main distinction between GHK and GHK-Cu is that GHK-Cu contains copper ions
The 100mg vial at $100 ($1.00/mg) offers significantly better per-milligram value than the 50mg at 36,800 (736.00 per mg) a 37.5% lower cost per mg for just $20 more upfront
By contrast, Aw et al
Some anecdotal reports mention reduced scarring or adhesions in surgical recovery when GHK-Cu is used
Seek prompt medical attention for trouble breathing, facial or throat swelling, fainting, chest pain, severe abdominal pain, persistent vomiting, neurological symptoms, signs of infection, or another severe or unexpected reaction
It may also control the formation of melanin, which would eventually assist to lighten dark spots and produce a more even complexion