February 2021 in “Journal of The American Academy of Dermatology” Fibrosis in the bulge area of hair follicles can cause hair thinning in male pattern baldness, and drugs that inhibit fibrosis might help reverse this.
May 2019 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature” 
April 2023 in “Journal of Investigative Dermatology” Baricitinib at 2mg and 4mg doses improved work productivity and reduced costs for adults with atopic dermatitis.
A protein called sFRP4 can partly inhibit hair growth.
5 citations
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November 2017 in “Asian journal of pharmaceutical and clinical research” Pakis Gajah (Angiopteris evecta) water extract may promote hair growth in rabbits, but more research is needed for human use.
5 citations
,
May 2020 in “Journal of the American Academy of Dermatology” AGA might indicate higher risk for severe COVID-19.
February 2018 in “Chinese Journal of Dermatology” Diammonium glycyrrhizinate at 0.01 μmol/L promotes hair growth by activating the Wnt/β-catenin pathway.
April 2026 in “American Journal of Clinical Dermatology” 
Meis2 is essential for touch sensation and proper nerve connection to touch receptors in certain skin areas of mice.
January 2015 in “International Journal of Nanomedicine” Anionic squarticles can effectively counteract amitriptyline overdose, improving survival rates.
1 citations
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December 1971 in “PubMed” January 2026 in “British Journal of Dermatology” Caffeine and DMG increase calcium influx in hair follicle cells without being toxic.
140 citations
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February 2014 in “Neuron” Delta opioid receptors help regulate touch sensation by reducing neurotransmitter release in the spinal cord.
42 citations
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July 1993 in “Journal of Investigative Dermatology” 
15 citations
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January 2020 in “BioMed Research International” BTA safely and effectively treats hair loss, and works better with FNS.
3 citations
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August 2018 in “Deleted Journal” Guasha changed rat skin appearance and blood vessels temporarily without affecting certain nerve proteins or fiber structure.
12 citations
,
January 1994 in “Dermatology” The patient's hair had unique damage and a lower sulfur-to-nitrogen ratio compared to relatives, but not compared to healthy controls.
January 1996 in “Springer eBooks” 
Bacopa monniera promotes hair growth, enhances memory, and helps with inflammation and stomach issues.
65 citations
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May 2001 in “Journal of Analytical Toxicology” Basic drugs like amphetamine are absorbed more in darker hair than lighter hair.
4 citations
,
November 2024 in “Journal of Advanced Research” Targeting NMMHC IIA may help treat blood-brain barrier damage.
22 citations
,
December 2010 in “Journal of Cosmetic Dermatology” Finasteride may increase depression by reducing brain cell growth.
May 2005 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature” Truncated LTBP-1 disrupts TGF-beta signaling, affecting hair growth.
2 citations
,
June 2004 in “PubMed” Carbamazepine caused hair loss in a man, which stopped after he stopped taking the drug.
5 citations
,
May 2011 in “Movement Disorders” Finasteride may help reduce tic severity in male Tourette syndrome patients.
52 citations
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April 2002 in “Brain Research” Lower allopregnanolone levels increase stress-related dopamine release in the brain.