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Stem cell activation: GHK-Cu has been shown to stimulate dermal stem cells and promote the proliferation of fibroblasts the skin cells responsible for producing collagen, elastin, and hyaluronic acid

Aging Cell, 20(4), e13350

Current evidence suggests intranasal delivery achieves significantly lower systemic bioavailability than injection, typically 2-5% without enhancement and potentially 15-45% with optimized formulations

Method for preparing cysteine-modified polypeptides under high-density fermentation conditions, China

It does not mean that combining these agents is safe rather, it means that no rigorous scientific evaluation of this combination has been conducted