Research indicates that concentrations of up to 2% in leave-on products (such as lotions and serums) are well-tolerated by most skin types, showing no significant adverse effects or irritation in long-term dermatological studies
However, as research continued, experts found that GHK could modulate a number of different cells besides those in the liver.4 GHK is naturally found in human saliva, plasma, and urine, but its standard levels are reduced by over half once you reach age 60
effects on the learned helplessness paradigm in rats
Melanosome Transport and Autophagy Melanosome trafficking from the perinuclear area of melanocytes to peripheral dendrites, where pigments are transferred to keratinocytes, is tightly regulated by cytoskeleton-linked motor proteins, such as kinesin, the tripartite protein complex Rab27a/melanophilin/myosinVa, and small GTP-binding proteins [124]