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8 One similar study on a lower concentration (0.4% GHK-Cu) applied topically for venous statis ulcers, did not find benefit over placebo

may also help to protect the brain.(37) L-Phenylalanine - amino acid that is a precursor to many of the brain chemicals needed for sharp, clear mental function and mood balance.(38) L-Theanine green tea amino acid that raises Alpha brain waves to promote wakeful relaxation for creativity and productivity

Brain Research Bulletin, 126 (1), 29-40

Ascorbic Acid: Both are antioxidants, but GHK-Cu also stimulates ECM and healing, while vitamin C focuses on collagen synthesis and brightening

Retinoids already accelerate cell turnover