12 citations
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October 2004 in “Experimental Gerontology” Changes in testosterone and estrogen receptor genes can affect how men age, influencing body fat, hair patterns, and possibly leading to skin disorders.
Age-related changes in scalp glands may affect hair health, but sulforaphane might help.
31 citations
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December 2012 in “British Journal of Dermatology” Korean women's hair thins, weakens, and greys with age, with mineral and sterol changes.
14 citations
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August 1943 in “Archives of Dermatology” Applying estradiol to skin causes local changes but not cancer.
5 citations
,
October 2011 in “Small ruminant research” Goat hair growth and follicle activity change with the seasons and differ between males and females.
January 2025 in “Scientific Reports” Hair analysis can show changes in vitamin D levels over time.
January 2024 in “Wiadomości Lekarskie” Countries should improve sex education, access to contraception, and legal abortion options.
24 citations
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January 2011 in “Sexual Development” Intersex frogs have different brain gene activity related to sex and thyroid hormones.
1 citations
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July 2022 in “International Journal of Rheumatic Diseases” People with ankylosing spondylitis in Taiwan don't have a higher chance of getting alopecia.
4 citations
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June 2017 in “Endocrine Reviews” Dihydrotestosterone (DHT) mainly affects nearby cells, doesn't significantly change prostate hormonal environment or cancer risk, and doesn't play a main role in causing hair loss or acne. More research is needed on its effects on heart health, sexual function, and bone health.
August 2023 in “Physician's journal of medicine” Hashimoto thyroiditis is an autoimmune disease that can lead to an underactive thyroid and is treated with medication and sometimes diet changes or surgery.
9 citations
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June 2002 in “Best Practice & Research in Clinical Obstetrics & Gynaecology” Testosterone therapy can help women with androgen deficiency by improving energy, sex drive, and bone health with few side effects.
October 2023 in “BMC endocrine disorders” A pineal tumor caused a boy's early puberty, which changed from peripheral to central after treatment.
13 citations
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January 2020 in “Neuroscience” Blocking 5α-reductase can harm memory and brain structure, and increase harmful brain changes in male mice used for Alzheimer's disease research.
5 citations
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June 2018 in “Elsevier eBooks” Testosterone is important for male sexual traits, reproduction, muscle and bone health, blood production, and metabolism, and works both directly and after being changed into other hormones.
September 2024 in “Health of Man” High uric acid can cause health issues, so managing it with lifestyle changes is important.
57 citations
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November 1987 in “Pediatric Dermatology” Children's hair grows in different types from before birth through puberty, with growth rates and characteristics varying by age, sex, and race.
January 2021 in “Deep Blue (University of Michigan)” Androgen receptors in the brain affect metabolism and reproduction differently in males and females, and may help manage PCOS symptoms in females.
2 citations
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September 2024 in “Animal Cells and Systems” Hepatitis B virus alters steroid hormones in male mice, reducing dihydrotestosterone to inhibit viral replication.
5 citations
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April 2024 in “bioRxiv (Cold Spring Harbor Laboratory)” Aging skin shows thinner layers, fewer hair follicles, and new biomarkers like increased space between cells and smaller sebaceous glands.
3 citations
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February 2019 in “Journal of Cosmetic Dermatology” The effects of estrogen on human scalp hair growth are unclear and need more research.
21 citations
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June 2016 in “Journal of Medical Primatology” Captive management practices affect hair loss and stress in rhesus monkeys, with differences between facilities.
35 citations
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March 2021 in “BMJ Open Respiratory Research” Older age, being male, and Asian ethnicity led to worse COVID-19 outcomes, with many experiencing long-term symptoms.
5 citations
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January 2021 in “PeerJ” Elephant tail-hair can show past stress levels, matching times when stressful events happened.
2 citations
,
May 1981 in “Journal of Animal Science” Hair mineral analysis is not very useful for assessing overall mineral composition in animals.
1 citations
,
August 2024 in “PubMed” Zhuangyao Jianshen pill reduces prostate enlargement and inflammation in rats.
July 2025 in “Journal of Investigative Dermatology” Androgens reduce THY1 in skin cells, leading to less fat, more fibrosis, and worse healing in males.
January 2016 in “Human & Experimental Toxicology” A specific DNA sequence caused hair loss in male mice by activating immune cells and increasing a certain immune signal.
January 2018 in “日本薬理学会年会要旨集 =” Stopping finasteride improves sperm quality but not semen volume in young men.
58 citations
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January 2018 in “International Journal of Women's Dermatology” Alopecia significantly lowers women's quality of life, with psychological and social challenges, highlighting the importance of early treatment and support.