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Laboratory studies show GHK-Cu treatment results in improved hair shaft diameter, enhanced cuticle structure regularity, increased cortical density, and superior overall fiber integrity, translating into hair that appears thicker, stronger, and more resistant to breakage in experimental models

The appetite effect is a matter of neural signaling: area postrema neurons project to the parabrachial nucleus and onward to forebrain regions that govern the decision to stop eating, and this circuit also engages hedonic pathways that reduce the rewarding value of food

A: Results can last long if maintained with proper skincare, sun protection, and occasional maintenance doses