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The Short Answer GHK-Cu is biologically active, not just a fashionable label

Picrotoxin acts as a competitive antagonist of GABAARs, acting on synapses as a non-competitive channel blocker for GABAARs chloride channels, specifically the GABA-activated chloride ionophore [229]

578 Pharmacological treatments include cholinergic agonists, such as bethanechol, to stimulate detrusor muscle contraction, antimuscarinic agents, such as oxybutynin or tolterodine, for overactive bladder symptoms, and beta-3 agonists, such as mirabegron, to relax bladder smooth muscle during the storage phase

Not because you dont care, but because the biology temporarily shifts