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Plasma concentrations of GHK in humans are reported at roughly 200 ng/mL in young adults and decline to approximately 80 ng/mL by age sixty [2]

however, phosphorylation of c-Met by EGFR occurs without production of hepatocyte growth factor (HGF) or another secreted factor, supporting a ligand-independent mechanism

Alternative Therapies in Health and Medicine, 26(4), 43-49

The foundational study behind this claim Khavinson, Bondarev, and Butyugov (2003), published in the Bulletin of Experimental Biology and Medicine found that Epitalon treatment increased expression of the telomerase catalytic subunit and telomerase enzymatic activity in human fetal fibroblast cultures, with corresponding telomere elongation in cells that had been telomerase-negative

The nutrient is slowly released into the blood

Animal-based products like meat, eggs, dairy products, and fish are excellent sources of vitamin B12