Certain ingredients in personal care products, like formaldehyde, oxidative hair dyes, and sulfates, pose health risks and need careful review.
October 2023 in “Animal production science” Vitamin A deficiency changes cattle hair structure, while pregnancy may improve it, suggesting hair can indicate cattle health.
2 citations
,
July 2018 in “Journal of drug delivery and therapeutics” Onion and eucalyptus oil shampoo effectively treats dry hair and promotes hair growth.
2 citations
,
November 1995 in “American Journal of Obstetrics and Gynecology” Taking vitamin B6 corrected a pregnant woman's metabolic disorder, which changed her hair color.
January 2022 in “Clinical Cases in Dermatology” A man has a common skin condition called seborrheic dermatitis, treated with special shampoos and sometimes medication.
24 citations
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May 2019 in “PLOS genetics” Mutations in the HEPHL1 gene cause abnormal hair and cognitive issues.
5 citations
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January 1970 in “Journal of Nepal Paediatric Society” Hair loss can be a key sign of a rare type of rickets when vitamin D treatment doesn't work and advanced tests aren't available.
May 2025 in “AlQalam Journal of Medical and Applied Sciences” Low iron levels are common but not directly linked to hair loss in women.
January 2026 in “Clinical Case Reports” A 6-year-old girl had both monilethrix and trichorrhexis nodosa, causing brittle hair, with minimal improvement from treatment.
5 citations
,
December 2020 in “International journal of biological macromolecules” Treatments improved hair surface and scale structure but didn't increase certain bonds in the hair cortex.
November 2025 in “Cosmetics” Rice germ oil improves hair health, but adding ferulic acid offers limited benefits and may worsen chemically damaged hair.
February 2022 in “Fibers” Scientists created a non-toxic, sugar-based hair product that can style hair without damage.
October 2021 in “European Journal of Dermatology” CAL-PDT is safer and more effective for treating actinic keratosis on the scalp.
1 citations
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August 2024 in “Polish Journal of Environmental Studies” Air pollution can damage hair and scalp, causing hair loss and inflammation.
13 citations
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April 2018 in “Journal of The American Academy of Dermatology” People with certain types of hair loss, especially lichen planopilaris and telogen effluvium, as well as African Americans, Asians, and men, are more likely to have severe vitamin D deficiency.
August 2025 in “Vestnik dermatologii i venerologii” "Selenzin" and dietary changes significantly improved hair density and reduced hair loss.
35 citations
,
January 2001 in “Journal of Animal Science” High dietary selenium, especially inorganic, causes weight loss and selenosis in pigs, with effects varying by hair color.
7 citations
,
September 2019 in “Journal of Investigative Dermatology”
January 2014 in “Journal of Pigmentary Disorders” Women's hair gets thinner and grayer as they age, with treatments available for hair loss and graying.
January 2024 in “International Journal of Advanced Research” Topical 6% salicylic acid effectively reduced skin plaques in a patient with wooly hair and palmoplantar keratoderma.
September 2015 in “Pediatrics in review” The baby's rash and hair loss were cured with zinc supplements and better skin care.
97 citations
,
March 2006 in “Journal of Investigative Dermatology” Mutations in the DSG4 gene cause a severe form of brittle hair and skin issues.
11 citations
,
November 2003 in “PubMed” Treatments with certain oils and resins make hair shinier, while zinc oxide and synthetic sebum make it duller.
1 citations
,
July 1996 in “Clinical and Experimental Dermatology” Routine thyroid tests for diffuse alopecia in women may not be necessary, but checking for iron deficiency anemia could be useful.
6 citations
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December 2019 in “International Journal of Cosmetic Science” White hair has weaker tryptophan fluorescence than other unpigmented fibers, possibly due to UV exposure or unknown substances.
November 2024 in “GSC Biological and Pharmaceutical Sciences” Phytochemicals from plants can improve hair growth, strength, and scalp health.
January 1994 in “中医杂志:英文版” Hair trace element levels can guide new treatments for aplastic anemia.
2 citations
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June 2020 in “Journal of Drug Delivery and Therapeutics” The document concludes that understanding hair problems can lead to cost-effective solutions and proper treatment choices.
24 citations
,
January 2006 in “Dermatologic clinics” Hair sunscreens are important for maintaining hair's cosmetic value.
2 citations
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December 2013 in “Journal of Cosmetic Dermatology” UV treatment can damage hair, so protection is advised.