June 2024 in “Nature Cell and Science” The Scalp Coverage Scoring method reliably measures hair density from images.
September 2024 in “Journal of the American Academy of Dermatology” Dermatologists can detect smaller hair density changes than previously thought.
May 2025 in “Archives of Dermatological Research” Patient-reported hair improvements align with actual hair density changes, not hair width.
September 2023 in “Journal of the American Academy of Dermatology” Dermatologists can accurately detect smaller differences in hair density than previously thought.
26 citations
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November 2005 in “Journal of Investigative Dermatology Symposium Proceedings” TrichoScan effectively measures hair growth improvements in people using minoxidil.
31 citations
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August 2001 in “PubMed” TrichoScan accurately measures hair growth and showed improved hair counts and thickness after finasteride treatment.
3 citations
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January 1994 in “Journal of Society of Cosmetic Chemists of Japan” Hair grows slower and thinner with age, but a test tonic improved growth in alopecia subjects.
March 2026 in “Mendeley Data” rwSALT provides precise hair regrowth measurement from scalp photos.
25 citations
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June 2003 in “Journal of Investigative Dermatology Symposium Proceedings” Phototrichogram and hair diameter measurements are effective, noninvasive ways to assess hair growth and detect early hair loss, with the most common pattern being reduced hair density.
August 2018 in “Journal of The American Academy of Dermatology” Aging significantly affects the hair and scalp of nonbalding Caucasian women, with changes that differ from male pattern baldness.
1 citations
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June 2022 in “Journal of The American Academy of Dermatology” Combining scalp photos with hair density and caliber measurements gives a more accurate assessment of hair loss.
September 2022 in “International Journal of Trichology” Trichoscopic measurements help determine the severity of female pattern hair loss.
6 citations
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May 2020 in “Molecules/Molecules online/Molecules annual” Yak belly hair has higher porosity and is less stiff than human hair, making it absorb dye better but less suitable as a direct substitute for hair dyeing.
9 citations
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July 2014 in “Skin research and technology” Stretching damages Caucasian hair's structure more easily than Asian hair.
4 citations
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April 2016 in “Experimental Dermatology” AGA causes hair loss through follicle miniaturization and hair cycle changes; regrowth depends on anagen initiation in kenogen follicles.
The authors defended their methods for measuring hair density and caliber, emphasizing the need for consistent photography and manual counting for accuracy in evaluating hair loss treatments.
29 citations
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March 2008 in “Dermatologic Surgery” The Cross-section Trichometer is a new tool that can measure hair quantity and detect hair loss and growth.
61 citations
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April 2012 in “British Journal of Dermatology” Caucasian women's hair appears thickest in their 20s, with perceived thinning after mid-30s due to both decreasing density and diameter.
41 citations
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December 2008 in “International Journal of Dermatology” South Korean women with hair loss have lower hair density and thickness compared to healthy women.
February 2015 in “Dermatologic Surgery” Smaller reticle sizes are as accurate as the standard size for measuring hair density in hair restoration.
4 citations
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November 2011 in “Archives of Dermatology” The photographic method for measuring facial hair density is reliable and valid but needs further testing on different hair densities and skin colors.
24 citations
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November 2013 in “British Journal of Dermatology” Chemotherapy causes hair loss starting soon after treatment begins and recovers about 3 months after ending, while tamoxifen does not significantly affect hair growth.
3 citations
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January 2021 in “Hair transplant forum international” The Hair Diameter Index (HDI) was created to help plan hair restoration surgery after finding that visual hair density is linked to hair count and thickness, not volume.
September 2010 in “Advances in Dermatology and Allergology/Postępy Dermatologii i Alergologii” TrichoScan is reliable for counting and measuring hair density but may not accurately assess hair types in women with hair loss.
September 2014 in “Daehan miyong hakoeji” Adding 2% glycerin or hyaluronic acid to permanent wave treatments reduces hair damage, with hyaluronic acid being more effective.
83 citations
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April 1999 in “Dermatologic Surgery” The research found that for a typical hair density, about 11 square centimeters of donor scalp is needed to get 800 hair grafts for transplantation.
68 citations
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March 2018 in “Biomaterials” Tiny needles with valproic acid can effectively regrow hair.
February 2026 in “Bioengineering” Hyperbaric oxygen therapy may improve hair and scalp health.
July 2012 in “British Journal of Dermatology” Women generally want more hair volume, which becomes a concern around menopause due to hair loss.
September 2013 in “Daehan hwajangpum hakoeji/Daehan hwa'jangpum haghoeji” Shampoo with ginseng helped improve hair thickness, density, growth, and reduced hair loss.