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(1) V Kh Khavinson, I E Bondarev, and A A Butyugov (2003) Epithalon peptide induces telomerase activity and telomere elongation in human somatic cells Bulletin of Experimental Biology & Medicine, 2003 Jun, Volume 135 (Issue 6), Pages 590-2

Richie JP Jr, et al

Sessions typically run 30 to 60 minutes, depending on the treatment selected

The copper content of GHK-Cu formulations has been a theoretical safety consideration, given that excessive copper can be toxic - however, the amounts used in cosmetic and research applications are extremely small, the copper is tightly chelated by the peptide (reducing free copper availability), and topical absorption of copper from these products appears minimal and well below levels that would cause systemic copper accumulation or toxicity