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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 plasma obtained was analysed for the presence of Copper using Atomic Absorption Spectroscopy

Greying Hair: Some people may also experience hair greying after receiving glutathione injections, as this affects the bodys melanin content

I've used up ampoules that are long out of date and have been subjected to fluctuating heat (terrible for wine!) due to being in my car, etc, and haven't noticed any difference