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GHK-Cu is a naturally occurring copper-binding tripeptide that may influence hair follicle size, anagen phase duration, and follicular inflammation, but these effects are based on preclinical data only and have not been confirmed in human trials

(8) There are several neurotransmitters and functions considered by scientists to be important, such as dopamine, nitrous oxide, prostaglandin, and other neuron systems

The mechanism is well-characterized

Three cell populations matter most for hair: dermal papilla cells (the population at the base of the follicle that orchestrates the growth cycle), keratinocytes (the cells that build the hair shaft itself), and fibroblasts (the connective-tissue cells that support the surrounding scalp matrix)

Biomed Res Int 12:2019 Chen C, Zhou M, Ge Y, Wang X (2020) SIRT1 and aging related signaling pathways

In contrast, our guide to natural peptides differentiates endogenous peptide biology from synthetic analogs