August 2021 in “Journal of Investigative Dermatology” Stress causes hair loss by making the body produce cortisol, which stops hair cells from growing.
3 citations
,
June 1979 in “The Journal of Dermatology” Glycosaminoglycan levels peak early in hair growth and decrease as the cycle progresses.
December 1991 in “Employment relations today” Hair follicle testing is more reliable and effective for drug screening than urinalysis.
168 citations
,
January 2005 in “Journal of Investigative Dermatology” Male and female mice have different skin thickness, and hormones affect their skin and hair growth differently.
October 2023 in “Al-Anbar medical journal” The clinic-based hair fall count method is accurate and reliable.
April 2018 in “The journal of investigative dermatology/Journal of investigative dermatology” Aging causes changes in scalp cells that can negatively affect hair health.
1 citations
,
April 2025 in “Pediatria i Medycyna Rodzinna” Restoring EDA and WNT pathways early may help improve skin, hair, and teeth issues in hypohidrotic ectodermal dysplasia.
October 2023 in “Asian journal of pharmaceutical and clinical research” Standardized data is essential for diagnosing scalp and hair conditions in males.
5 citations
,
September 2015 in “BMC Medical Genetics” The EDAR gene mutation leads to thinner and more deformed hair shafts.
November 2024 in “Journal of Investigative Dermatology” Changes in hair follicle structure may help diagnose and monitor alopecia.
31 citations
,
February 2020 in “BioMed Research International” Thai people's hair density decreases with age and varies by scalp area, but hair thickness stays the same regardless of age or scalp area.
50 citations
,
June 2014 in “Experimental and Clinical Endocrinology & Diabetes” Hair hormone levels can indicate obesity-related changes and are useful for research and clinical practice.
1 citations
,
November 2014 in “Journal of Biomedical Optics” Reflectance spectroscopy can noninvasively track hair growth stages by measuring skin reflectance and melanin changes.
179 citations
,
May 1982 in “The Journal of clinical investigation/The journal of clinical investigation” High levels of 3 alpha-diol glucuronide in the blood are a marker of increased androgen action in women with excessive hair growth of unknown cause.
March 2026 in “Nutrients” Hair manganese may relate to cardiometabolic health, not coronary artery disease severity.
1 citations
,
January 1995 in “Journal of Investigative Dermatology” RU58841, a substance from France, can potentially block the effects of hormones that cause hair loss and excessive hair growth, performing better than a similar substance, cyproterone acetate.
35 citations
,
January 2014 in “Postepy Dermatologii I Alergologii” DHT's role in hair loss is important, but measuring its level for diagnosis is questionable.
August 2018 in “Psychological Science”
December 2019 in “bioRxiv (Cold Spring Harbor Laboratory)” Redheaded people have higher levels of a vitamin D precursor, suggesting red hair may be an adaptation for better vitamin D synthesis in areas with less sunlight.
3 citations
,
August 2011 in “PubMed” Coconut oil protects hair from damage better than regular grooming practices.
5 citations
,
August 2011 in “Journal of Dermatological Science” Dentin sialoprotein and phosphophoryn are present in rodent hair follicles and may help hair growth and development.
April 2022 in “Journal of Cosmetic Dermatology” Trimax-360 Serum, when used for 98 days, safely and effectively improves hair growth, thickness, and density without any side effects.
15 citations
,
January 2012 in “International journal of trichology” The HairCheck® device is effective for measuring hair loss and growth in people with alopecia.
51 citations
,
November 1988 in “The Journal of Clinical Endocrinology & Metabolism” Higher levels of a specific hormone are linked to more chest hair and acne in men.
July 2025 in “Food Science & Nutrition” Vitamin D supplements improve hair growth and metabolism in rabbits.
November 2023 in “Journal of animal science/Journal of animal science ... and ASAS reference compendium” Pig hair cortisol levels are inheritable and linked to stress responses, which could help select for more resilient pigs.
November 2022 in “The journal of investigative dermatology/Journal of investigative dermatology” The study found markers indicating that cells responsible for hair color are differentiating in specific areas of the hair follicle.
12 citations
,
June 2006 in “Anais Brasileiros de Dermatologia” The study found average numbers for different types of hair follicles in the scalp and observed differences between men and women, suggesting reasons for more common hair shedding in women.
January 2021 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature” Aging affects the cells around hair follicles, which may influence female pattern hair loss and treatment options.
4 citations
,
July 2020 in “Biochemical and Biophysical Research Communications” A protein called ectodysplasin-A2 increases a hair growth inhibitor in balding cells, which could be a target for hair loss treatment.