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The intramuscular injections causes stinging sensation or a bit sore at the time of injecting only

It is important to emphasise that these proposals are based almost entirely on preclinical data principally in vitro (cell culture) experiments and animal studies and have not been reliably demonstrated in robust human clinical trials: Stimulation of follicle enlargement: Laboratory studies suggest GHK-Cu may increase hair follicle size, potentially counteracting the miniaturisation associated with androgenetic alopecia (pattern hair loss), though this has not been confirmed in humans

More is understood about the TRE element

Usage: After cleansing and toning the skin, apply a few drops to the face and neck in gentle patting motions