Yes, GHK-Cu has been a prominent cosmetic ingredient since the 1990s, used in topical formulations for skin and hair preparations
By binding to receptors on immune cells, VIP suppresses the activity of inflammatory signaling molecules and modulates the behavior of immune cells, including T cells and macrophages (7)
Acknowledgements This work was supported by the Austrian Science Fund (10.55776/COE16, T.H.), the Swedish Research Council (2023-03058, T.H.), the Swedish Brain Foundation (FO2022-0300, T.H.), the Novo Nordisk Foundation (NNF23OC0084476, T.H.) and the European Research Council (ERC-2020-AdG-101021016
Plasticity of excitatory synaptic transmission to interneurons has been investigated in much less detail than in pyramidal neurons and other excitatory neurons
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Consider your comfort with invasiveness Strong aversion to needles nasal sprays usually win