Guard hair length is positively correlated with guard hair diameter and down fiber length, but negatively correlated with variation in guard hair diameter and down fiber diameter.
September 2022 in “Canadian journal of animal science” Certain gene variations are linked to the thickness of cashmere goat hair.
6 citations
,
October 2018 in “Endocrinology” Prenatally androgenized ewes can model increased hair diameter in women with PCOS.
23 citations
,
January 1981 Hair is mostly made of three protein types: helical, high-sulfur, and high-tyrosine.
39 citations
,
March 1987 in “Journal of The American Academy of Dermatology” Topical minoxidil is a safe and effective treatment for hair loss caused by androgenetic alopecia.
47 citations
,
July 1967 in “Science” Not eating enough protein can cause hair roots to shrink and lose color, and hair to become thinner.
40 citations
,
December 2011 in “British Journal of Dermatology” Women's hair generally gets thinner and less dense starting in their mid-thirties, with hair loss becoming more common as they age due to both genetics and environment.
30 citations
,
October 2013 in “BMC dermatology” VEGF gel increases hair growth but may have potential toxicity.
20 citations
,
May 2020 in “Experimental Dermatology” Aging scalp skin contributes to hair aging and loss, and more research is needed to develop better hair loss treatments.
18 citations
,
August 2009 in “Skin Research and Technology” OCT can identify hair structures, but chemical treatments can damage them.
17 citations
,
January 2011 in “Skin Research and Technology” Hair from people with seborrheic dermatitis is thicker scaled, more damaged, and thinner than healthy hair, and atomic force microscopy can help monitor the condition.
17 citations
,
June 1990 in “PubMed” Hair varies in size and features depending on body region.
7 citations
,
January 2020 in “International Journal of Trichology” Coconut oil reduces hair damage and breakage more effectively than shampoos and conditioners.
3 citations
,
August 2011 in “PubMed” Coconut oil protects hair from damage better than regular grooming practices.
3 citations
,
August 1980 in “Acs Symposium Series” Hair increases in size when it absorbs water, and treatments like bleaching affect how much water it can take in.
2 citations
,
December 2025 in “Cosmetics” Proper scalp care can improve hair health and delay ageing signs.
March 2026 in “Journal of Cosmetic Dermatology” Topical Stemoxydine improves hair density in androgenetic alopecia with few side effects.
April 2025 in “Frontiers in Animal Science” Sheep exosomes can enhance hair growth in mice.
November 2024 in “Journal of Translational Internal Medicine” Exosomes from stem cells help hair regrowth by activating a specific signaling pathway.
January 2023 in “Minds at UW (University of Wisconsin)” More research is needed to understand how shampoo chemicals affect hair strength and structure.
405 citations
,
January 2004 in “Journal of Investigative Dermatology” Hair follicle size and distribution vary significantly across different body sites.
20 citations
,
February 1985 in “Archives of Dermatology” Minoxidil helps hair regrowth, especially with more indeterminate hairs.
13 citations
,
August 1995 in “Australasian Journal of Dermatology” Hair follicles are smaller in people with androgenetic alopecia compared to those with normal scalps.
1 citations
,
January 2019 in “PubMed” cgVEGF164 boosts hair follicle growth in mice.
May 2025 in “Journal of Traditional Chinese Medical Sciences” Stellera chamaejasme L. extract promotes hair growth by activating hair growth genes.
May 2025 in “Journal of Photochemistry and Photobiology B Biology” Blue LED light improves hair treatments for Caucasian and Asian hair but not for African hair.
May 2025 in “Indian Journal of Pharmacology” Rosemary and capsicum extracts can help hair growth in rats with hair loss.
Qu-shi-yu-fa Decoction may help treat hair loss by promoting hair growth and strengthening hair follicles.
September 2002 in “Dermatologic Surgery” The recipient site can affect the growth and survival of transplanted hair but not its thickness.
April 2025 in “OPAL (Open@LaTrobe) (La Trobe University)” Exosomes from small-tailed Han sheep enhance hair growth in mice.