April 2023 in “Journal of Investigative Dermatology” Being allergic to linalool, a common fragrance ingredient, might contribute to developing frontal fibrosing alopecia.
April 2023 in “Science of The Total Environment” 
14 citations,
May 2022 in “Asian Journal of Pharmaceutical Sciences” New hair follicle-targeting treatments show promise for hair disorders but need more research on safety and effectiveness.
March 2022 in “International Journal of Trichology” Smoking may worsen hair loss, but more research is needed.
31 citations,
August 2021 in “Stem Cell Research & Therapy” The conclusion is that understanding how hair follicle stem cells live or die is important for maintaining healthy tissue and repairing injuries, and could help treat hair loss, but there are still challenges to overcome.
102 citations,
July 2020 in “International journal of molecular sciences” Hormones like testosterone and estrogen significantly affect hair growth and structure.
11 citations,
July 2020 in “Journal of Cosmetic Dermatology” Sandalore® improves hair growth and quality in people with hair loss.
4 citations,
January 2020 in “Skin appendage disorders” Toxic metals can cause hair loss and should be considered by doctors.
31 citations,
February 2019 in “International Journal of Cosmetic Science” Caffeine applied to the scalp can protect hair follicles from UV damage.
82 citations,
September 2018 in “Nature Communications” A certain smell receptor in hair follicles can affect hair growth when activated by a synthetic sandalwood scent.
26 citations,
January 2018 in “Skin appendage disorders” Thallium, mercury, selenium, and colchicine strongly cause hair loss.
4 citations,
June 2017 in “Anais Brasileiros De Dermatologia” Aryl hydrocarbon receptor overexpression found in miniaturized hair follicles in female hair loss.
70 citations,
April 2017 in “Lasers in surgery and medicine” Blue light promotes hair growth by interacting with specific receptors in hair follicles.
30 citations,
April 2017 in “European Journal of Cell Biology” CIP/KIP proteins help stop cell division and support hair growth.
9 citations,
April 2016 in “Cutaneous and ocular toxicology” Alpha Lipoic Acid helps protect skin from smoking damage.
16 citations,
October 2015 in “Photochemistry and photobiology” Reducing copper (II) ion levels in hair can decrease hair damage.
19 citations,
January 2015 in “Current problems in dermatology” Ultraviolet rays damage hair, smoking may cause hair loss, and good nutrition is important for hair health, but genetics mainly decide hair thickness.
94 citations,
May 2011 in “BJCP. British journal of clinical pharmacology/British journal of clinical pharmacology” Hair follicles greatly increase caffeine absorption through the skin shortly after it's applied.
182 citations,
December 2007 in “BJCP. British journal of clinical pharmacology/British journal of clinical pharmacology” Hair follicles significantly increase the speed and amount of caffeine absorbed through the skin.
62 citations,
January 2003 in “Dermatology” Sunlight worsens hair loss; protect scalp.
99 citations,
April 1998 in “The journal of investigative dermatology/Journal of investigative dermatology” Hair follicles help skin immune recovery after UVB exposure.
154 citations,
October 1996 in “Proceedings of the National Academy of Sciences of the United States of America” Estrogen affects hair growth and skin cell multiplication.
