July 2016 in “Indian journal of science and technology” Neonate scalp hair is thinner, lacks a medulla, and has smaller follicles compared to adult hair.
Human scalp hair follicles have PGE2 and its receptors, which might affect hair growth.
February 2010 in “Journal of the American Academy of Dermatology” Activating cAMP and ATP improves hair growth and strength.
Low doses of certain Chinese herbs can promote hair growth, while high doses may inhibit it.
January 2022 in “Journal of Cosmetic Dermatology” Placebo effects vary in hair loss trials, with split-scalp trials showing higher hair density after 6 months compared to whole-head trials.
January 1981 in “Springer eBooks” 234 citations,
December 1996 in “Journal of The American Academy of Dermatology” Middle-aged women with chronic telogen effluvium experience increased hair shedding but usually don't get significantly thinner hair.
124 citations,
April 1992 in “Journal of Endocrinology/Journal of endocrinology” Beard hair follicles have more androgen receptors than non-balding scalp hair follicles.
81 citations,
August 2014 in “Lasers in Surgery and Medicine” Red light therapy is safe and effectively increases hair growth in women with hair loss.
61 citations,
October 2005 in “The journal of investigative dermatology. Symposium proceedings/The Journal of investigative dermatology symposium proceedings” The document concludes that accurate diagnosis is crucial for effectively treating common scalp disorders, which often have similar symptoms.