At the level of receptor biology that framing is fair: both are analogs of growth-hormone-releasing hormone (GHRH), and both act on the same pituitary receptor to stimulate pulsatile, endogenous growth-hormone (GH) secretion and a downstream rise in insulin-like growth factor 1 (IGF-1)
Useful in neurological health, immune response, and hormone regulation
Zhao P, Kalhorn TF, Slattery JT
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When your skin is injured, your body naturally releases GHK to signal the start of the repair sequence
Individual variation in pain perception, skin sensitivity, and local tissue characteristics can influence the intensity of burning sensations