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Huang ZB, Zhao SS, Huang Y, et al

Below is the standard duration for each skin colour: Medium brown skin: 1-3 months Dark brown skin: 3-6 months Very dark skin: 6-12 months Black skin: 2 years or more

The earliest effects of GHK-Cu are often felt before they're seen

They might review the frequency of your treatments or explore other factors that could be contributing to this reaction

Avoid overuse: Using high concentrations too frequently can overstimulate collagen production, potentially leading to skin imbalance, breakouts, or sensitivity

For instance, you may benefit from using collagen-boosting ingredients, such as retinoids or vitamin C, in addition to a GHK-Cu peptide