69 citations
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May 2016 in “General and Comparative Endocrinology” This study found that hair cortisol concentrations in sheep were significantly increased by extensive brushing or dexamethasone treatment, suggesting that external factors may affect its reliability as a chronic stress measure.
June 2025 in “Universal library of medical and health sciences.” This study reviewed literature on hair growth and found that external factors like pollution, stress, and nutrition can adversely affect hair, concluding that a multifactorial approach and personalized nutrition monitoring are essential for effective hair loss therapy.
15 citations
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July 1998 in “PubMed” This study found that fentanyl accumulates differently in mouse hair after systemic administration compared to external loading, suggesting ionizable functionalities of hair influence drug retention from organic solutions.
64 citations
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April 1972 in “American Journal of Clinical Nutrition” Hair chromium levels reflect nutritional status after standard washing.
1 citations
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April 2016 in “CRC Press eBooks” Skin aging reflects overall body aging and can indicate internal health conditions.