research Conversion of the Nipple to Hair-Bearing Epithelia by Lowering Bone Morphogenetic Protein Pathway Activity at the Dermal-Epidermal Interface 41 citations, October 2008 in “The American journal of pathology” Blocking a specific protein signal can make hair grow on mouse nipples.
community A meta analysis of 18 popular hair loss treatments. An 2022 guide on efficacy. From finasteride and minoxidil to caffeine shampoo, saw palmetto and biotin. 96 Scientific References included. in Research/Science 103 upvotes 2 years ago Most hair loss treatments are ineffective; only finasteride, dutasteride, and minoxidil show effectiveness.