February 2026 in “International Journal of Molecular Sciences” In this study, the researchers found that cholinergic signaling via M4 muscarinic receptors influences hair growth, with enhanced elongation observed upon activation with bethanechol, highlighting its potential role in hair biology using mouse models.
This study observed that stimulating the cholinergic system via muscarinic receptors in dermal papilla cells and other hair-related tissues promoted hair growth, with mechanisms involving the activation of Wnt/β-catenin signalling pathways in cell cultures and increased hair shaft elongation in mouse vibrissae treated with bethanechol.
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June 2006 in “Experimental dermatology” In this study, researchers identified similar presence of various nicotinic and muscarinic AChRs in lesional and normal epidermis, suggesting that tobacco-delivered nicotine may exacerbate acne inversa by interacting with endogenously produced acetylcholine.
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July 2025 in “Frontiers in Immunology” This study explored peripheral blood immune dysregulation in alopecia areata through single-cell analyses, identifying systemic changes linked to disease severity and key signaling roles for monocytes, NK cells, and memory T cells, suggesting potential therapeutic targets.
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December 2016 in “Trichology and cosmetology:” This review highlights the potential of Panax ginseng as a promising natural treatment for hair loss, despite limited published research on its effects.