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Upper arms work well though they prove more difficult for self-administration without assistance
Even when refrigerated, it lacks an active agent to inhibit bacterial growth
Some studies cited in a 2025 review noted that while proline can protect cells at low levels, when metabolized by the enzyme proline oxidase it produces reactive oxygen species (ROS)
Clinical studies demonstrate that GHK-Cu: Improves skin elasticity Reduces fine lines in some cosmetic studies Increases dermal thickness Enhances wound healing in limited models However: Most trials are small Many are cosmetic rather than mechanistic Long-term systemic data are limited Claims regarding hair regrowth and systemic anti aging effects exceed what controlled human trials demonstrate
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Skin Whitening & Brightening: Reduces melanin production, leading to a lighter skin tone
