28 citations
,
March 1973 in “The Journal of Clinical Endocrinology & Metabolism” Altered DHEA metabolism in hair follicles may be linked to hair loss in balding men.
1 citations
,
July 2022 in “Functional foods in health and disease/Journal of functional foods in health & disease” Taking a probiotic supplement twice a day improved hair growth, skin hydration, and metabolic health in adults at risk of metabolic syndrome.
241 citations
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August 2005 in “Journal of Investigative Dermatology Symposium Proceedings” Dandruff and seborrheic dermatitis are caused by yeast feeding on scalp oils, leading to irritation and flaking.
August 1993 in “Journal of Dermatological Science” Testosterone metabolism in balding scalp cells may not be the main cause of hair loss.
Thicker scalp fat may link hair loss with metabolic syndrome.
April 2023 in “Journal of Investigative Dermatology” Staphylococcus epidermidis affects hair growth and metabolism, suggesting it could help manage hair growth issues.
17 citations
,
October 2003 in “Brazilian Journal of Medical and Biological Research” The gene SDR5A1 is found in scalp hair of both hirsute and normal individuals, but it does not explain differences in hair growth.
29 citations
,
May 1986 in “Journal of Steroid Biochemistry” Androgens don't directly affect hair cell growth or protein production.
28 citations
,
August 2003 in “Steroids” Hirsute women have lower type 2 17β-HSD enzyme levels, which improve with treatment.
1 citations
,
June 2023 in “Sciential - McMaster Undergraduate Science Journal” Scalp cooling effectively prevents hair loss in breast cancer patients undergoing chemotherapy.
4 citations
,
April 2001 in “Experimental Dermatology” Using single dermal papillae is unreliable for analyzing androgen metabolism in hair follicles.
44 citations
,
November 1998 in “Australasian Journal of Dermatology” Accurate diagnosis is key for treating different kinds of hair loss, and immune response variations may affect the condition and treatment results.
1 citations
,
January 2013 in “International Journal of Physical and Social Sciences” Hair and nails can show long-term changes in lead and calcium levels.
September 1998 in “Journal of The European Academy of Dermatology and Venereology” Aging can lead to poorer scalp and hair health, including less hair and more scalp diseases, which should be managed to help older people feel better.
September 2024 in “Brazilian Journal of Hair Health” Nutrients can help improve hair growth and thickness caused by pollution.
1 citations
,
September 2025 in “Journal of Cosmetic Dermatology” Addressing biological changes in lipids, metabolism, and microbiota may help treat hair loss in young Chinese females with oily scalps.
30 citations
,
July 2023 in “Clinical Chemistry and Laboratory Medicine (CCLM)” Cortisone in hair is a more reliable indicator of stress hormone exposure than cortisol.
4 citations
,
November 2020 in “BMC Dermatology” Researchers identified genes in scalp hair follicles that may affect hair traits and hair loss.
Age-related changes in scalp glands may affect hair health, but sulforaphane might help.
1 citations
,
April 2019 in “Acta medica Philippina” Androgenetic alopecia is linked to a higher risk of metabolic syndrome.
44 citations
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March 2004 in “Journal of Investigative Dermatology” The effects of estrogen on human hair growth are unclear and need more research.
December 2025 in “Zenodo (CERN European Organization for Nuclear Research)” Hair loss is caused by mechanical, thermal, and metabolic stress, not just hormones.
November 2024 in “International Journal of Molecular Sciences” Hair helps prevent scalp skin cancer by supporting immune protection.
July 2023 in “British journal of dermatology/British journal of dermatology, Supplement” Aging changes scalp cells, possibly affecting hair health in older women.
January 2017 in “IP Indian journal of clinical and experimental dermatology” Early-onset male baldness is not linked to insulin resistance, but is significantly associated with metabolic syndrome.
November 2025 in “JDDG Journal der Deutschen Dermatologischen Gesellschaft” Restoring phenylalanine levels improved skin and hair symptoms in a PKU infant.
9 citations
,
January 2017 in “Annals of Dermatology” The study found genetic differences related to hair development that may explain hair loss in a patient with Trichorhinophalangeal syndrome type I.
As people age, certain enzymes in scalp glands decrease, affecting hair health.
December 2025 in “Zenodo (CERN European Organization for Nuclear Research)” Hair loss is caused by mechanical, thermal, and metabolic factors, not just hormones.
50 citations
,
May 1985 in “The journal of pediatrics/The Journal of pediatrics” Biotin deficiency in patients on total parenteral nutrition can cause serious symptoms but can be treated with biotin supplements.