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Its kind of everywhere - both in plants and in cosmetic products
Figure 3 5 Properties of melanin Peripheral melanin is produced in the epidermal layer of the skin
Some studies report subtle benefits as part of multi-nutrient interventions (B12 + folate + B6 + D), but the effect sizes are small and the contributions of individual nutrients are hard to isolate
Over the following decades, Pickart (who passed away in 2023 at age 85) and collaborators documented GHK-Cu's effects on wound healing, collagen production, hair growth, nerve outgrowth, and inflammation, building a substantial body of evidence that the peptide functions as a systemic tissue repair signal rather than having effects limited to any single tissue type
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