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Description
A practical way to think about concentration: For face and neck use, a 4% GHK-Cu concentration is often gentle enough for regular routines

It can also cause balance issues, numbness, or tingling sensations in our hands and feet, raising the chance of falls

Protective Effects of Collagen Tripeptides in Human Aortic Endothelial Cells by Restoring ROS-Induced Transcriptional Repression

However, severe or prolonged deficiency may cause permanent follicle damage
