4 citations
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October 2011 in “Medical journal of Tabriz University of Medical Sciences and Health Services” This study suggests that lower levels of zinc and copper in hair and serum, along with altered oxidative stress markers, may contribute to the development of alopecia areata and androgenetic alopecia.
April 2023 in “Acta Poloniae Pharmaceutica” This study found that using Urtica cannabina extract shampoo led to increased levels of copper, zinc, and iodine in the scalp hair of Mongolian women, along with improvements in hair growth, diameter, and density compared to a regular shampoo.
January 2017 in “Journal of Cosmetics, Dermatological Sciences and Applications” Among Chinese women, this study observed that hair density decreases and scalp erythema increases with age, with most aging features like hair diameter and sebum content peaking in their 40s.
March 1997 in “Medical Molecular Morphology” Zinc deficiency causes early scalp hair damage that recovers slower than skin symptoms.
4 citations
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August 2014 in “The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology” In this study, the Narasoo healing shampoo and Hair tonic were associated with improvements in scalp hydration, hair gloss, and hair growth, but further research is recommended to confirm these effects.