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Like with methacholine, the extra methyl side group in bethanechol results in selectivity for muscarinic vs nicotinic receptors, and contributes to resistance to metabolism by cholinesterases
It also offers anti-aging skin benefits, including the stimulation of collagen and elastin production, which improves skin texture, firmness, and hydration
AHK-Cu for skin: beyond hair growth While hair growth receives most attention in AHK-Cu discussions, the peptide also offers skin benefits that share mechanisms with its follicle effects
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