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The amount of copper in topical GHK-Cu products is far too small to cause systemic copper toxicity

In a separate head-to-head comparison, GHK-Cu outperformed both retinol (vitamin A) and vitamin C in improving skin firmness and elasticity, and it did so without the irritation, photosensitivity, or adjustment period associated with retinoid use

As GHK-Cu penetrates the skin, it works to prompt the production of proteins like collagen and elastin, helping to soften wrinkles and keep complexion firm over time

Functional instability involves neuromuscular deficits including impaired proprioception, delayed muscle reaction times, and poor motor control that persist even when mechanical structures appear intact