ghk-cu tolerance receptor downregulation antibody formation Synergy of GHK‐Cu and hyaluronic acid on collagen IV upregulation via fibroblast and ex‐vivo skin tests - Jiang - 2023 - Journal of Cosmetic Dermatology Sequential immune tolerance checkpoints balance
Description
GHK-Cu, for example, drops from 200 ng/mL at age 20 to 80 ng/mL by age 60

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However, the research also noted a complication

Several approaches are being investigated to overcome this limitation
