In addition to direct effects on ion channels, neurotransmitters may bind to G-protein coupled receptors, thereby eliciting cell-signaling effects that could result in metabolic changes (e.g., alterations in activity of various enzymes) within a postsynaptic cell (14)
(Springer Nature Singapore Pte Ltd.), 349386
10.1371/journal.pone.0127551 145 QuinnM
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They share a mechanism both are growth hormone-releasing hormone (GHRH) analogs that stimulate your pituitary gland to produce more of its own GH but the intensity, clinical profile, and ideal use case for each are meaningfully different
GHK-Cu is a potent angiogenic factor, meaning it stimulates the growth of new blood vessels