506 citations,
March 2005 in “The Journal of Clinical Endocrinology and Metabolism” Testosterone therapy improves physical function, strength, and body composition in older men with low testosterone levels.
417 citations,
February 2004 in “The Journal of Clinical Endocrinology and Metabolism” Testosterone therapy increases bone density in older men with low testosterone levels.
107 citations,
September 2002 in “Journal of Investigative Dermatology” Researchers found that hair shedding happens mostly when new hair is growing and involves a unique process.
81 citations,
April 2009 in “Journal of Investigative Dermatology” Hair shedding is an active process that could be targeted to treat hair loss.
77 citations,
November 2007 in “International Journal of Andrology” Testosterone with or without finasteride doesn't improve thinking skills in older men with low testosterone.
53 citations,
March 2014 in “Growth Hormone & IGF Research” IGF-1 injections help mice grow more hair by increasing cell growth and blocking a hair growth inhibitor.
35 citations,
March 2007 in “Skin Research and Technology” The conclusion is that exogen is a unique hair cycle phase and the new sampling method specifically targets this stage, which may help in future hair loss research.
34 citations,
February 2012 in “International Journal of Dermatology” Dermatoscopy can help identify hydroquinone-induced skin issues, avoiding invasive biopsies.
33 citations,
September 2012 in “Wound Repair and Regeneration” Applying calreticulin can speed up wound healing in diabetics.
24 citations,
December 2014 in “International Journal of Molecular Medicine” Eclipta alba extract helps increase hair growth and decrease hair loss-related protein in mice.
21 citations,
March 2017 in “Skin research and technology” Removing external lipids from hair reduces moisture and increases strength, while removing internal lipids decreases water permeability.
14 citations,
January 2009 in “Experimental Dermatology” Hair sheds gradually from the follicle, with readiness to shed indicated by less attachment material.
11 citations,
January 2004 in “Exogenous dermatology” Outside factors like grooming, chemicals, and the environment can damage hair and cause disorders.
5 citations,
August 2014 in “Dermatologic surgery” Advanced fluorescence technology effectively treats skin discoloration from certain creams.
4 citations,
January 2013 in “PubMed” Testosterone and finasteride raise insulin and zinc, lower chromium in male rats.
2 citations,
January 2017 in “Skin appendage disorders” Women with and without hair loss have similar amounts of exogen hairs, so these hairs are not a key factor in hair loss conditions.
2 citations,
October 2010 in “Journal of dermatological treatment” External treatments can change hair growth patterns in nude mice.
November 2023 in “JAAD case reports” Exogenous testosterone use may be linked to developing hidradenitis suppurativa.
January 2020 in “Frontiers in Medical Case Reports” A dog developed skin issues from too many steroids, but reducing steroids and using a specific treatment fixed the problems.
January 2016 in “Xumu Shouyi Xuebao” 
1 citations,
November 2019 in “Archives of breast cancer” Some hormone treatments might raise breast cancer risk, while others don't seem to.
September 2022 in “Research Square (Research Square)” Hydrocolloid wound dressings emit energy that can affect human hair follicle metabolism.
13 citations,
December 2006 in “Journal of experimental animal science” Interferon gamma alone can't cause alopecia areata in C3H/HeJ mice.
5 citations,
June 2021 in “Pharmacological Reports” Vitamin D may help reduce antibody levels in men with autoimmune thyroiditis and early-onset androgenic alopecia, but has no significant impact on thyroid function.
Melatonin reduces BMP2 gene expression in goat hair follicles during the resting period.
57 citations,
December 2018 in “JAMA Surgery” Hormone treatment for transgender patients may not need to be stopped before surgery, but more research is needed, especially on estrogen.
37 citations,
April 2013 in “Plastic and Reconstructive Surgery” Genetic and environmental factors, like smoking and exercise, affect male hair loss.
21 citations,
November 2012 in “Plastic and Reconstructive Surgery” Both genetic and lifestyle factors significantly affect female hair loss.
February 2020 in “The Pharmaceutical Society of Japan” 
65 citations,
October 2008 in “Journal of Neuroendocrinology”