July 2022 in “Research Square (Research Square)” Hair analysis can somewhat track past testosterone levels but is influenced by factors like hair washing, growth rate, sex, and hair color.
January 2025 in “Scientific Reports” Hair analysis can show changes in vitamin D levels over time.
67 citations
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May 2013 in “Therapeutic drug monitoring” Wait 4-5 weeks after drug use before hair testing and cut hair into three segments to confirm single drug exposure.
September 2023 in “Scientific reports” Segmental hair analysis can track testosterone over time but needs adjustments for sex, hair color, and washing frequency.
30 citations
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March 2012 in “Journal of Analytical Toxicology” THCCOOH levels in hair decrease from root to tip and don't match well with self-reported cannabis use.
8 citations
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March 2021 in “Drug testing and analysis” Researchers improved a method to more accurately estimate when and how long a drug was taken using hair analysis.
48 citations
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January 2018 in “Scientific Reports” Hair analysis can reveal metabolic changes and potential pregnancy complications.
May 2023 in “Frontiers in chemistry” Zolpidem shows up in hair from the top back of the head after one dose and fades over time, suggesting it gets into hair through blood and sweat.
20 citations
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August 2017 in “Drug testing and analysis” Drugs localize differently in hair strands based on their properties.
8 citations
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October 2022 in “International Journal of Legal Medicine” Drugs in drowned bodies' hair remain stable in natural water, aiding forensic analysis.
1 citations
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January 2008 in “China Journal of Bioinformatics” Goat skin has more keratin genes, while the mammary gland has more immunity-related genes.
27 citations
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March 2022 in “Forensic Toxicology” Micro-segmental hair analysis helps detect drug use patterns and estimate drug consumption days.
27 citations
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December 2006 in “Environmental Science & Technology” LA-ICP-MS can effectively track mercury exposure over time in hair.
December 2025 in “Dermatology Reports” Topical ruxolitinib quickly improves non-segmental vitiligo.
September 2001 in “PubMed” The new X-ray technique allows for precise and non-destructive measurement of elements in hair, creating the first database of its kind for a specific ethnic group.
1 citations
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July 2021 in “Forensic science international” Both a lock of hair and a single hair strand can show chronic drug use, but at least six single hairs are needed for accurate results.
7 citations
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September 2018 in “Aesthetic surgery journal” Deoxycholic acid effectively reduces double chin fat with temporary side effects and high patient satisfaction.
December 2024 in “Journal of the European Academy of Dermatology and Venereology” Bimatoprost shows promise for treating vitiligo, especially when combined with other therapies.
2 citations
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June 2020 in “BMC Health Services Research” Health warnings and public health actions led to a significant drop in flutamide prescriptions for women, but off-label use still continues.
2 citations
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September 2020 in “Schweizer Archiv für Tierheilkunde” Swiss Holstein cattle with curly, short hair carry genes from the Simmental breed.
April 2024 in “Journal of wildlife diseases” Muskox hair growth rates vary widely, so a single growth rate can't be used for all populations.
March 2026 in “Journal of the American Academy of Dermatology” Hair diameter diversity could improve androgenetic alopecia assessment and treatment planning.
Hair test results can be misleading due to external contamination, so they shouldn't be used alone to assess long-term drug use.
1 citations
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January 2023 in “International journal of all research education and scientific methods” Hair analysis is better than urine and blood for detecting past drug use.
October 2022 in “Linköping University medical dissertations” The method shows hair testosterone levels reflect those in saliva, but are affected by various factors and may indicate a risk for heart attack.
2 citations
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April 2025 in “Frontiers in Genetics” The ASIP gene is crucial for determining cattle coat color.
January 2012 in “Journal of Northwest A & F University” The Eda gene helps regulate the hair cycle in goats.
1 citations
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October 2020 Hair can reliably measure average estradiol levels over months in humans and monkeys.
5 citations
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March 2009 in “Pediatric Dermatology” The study found that pili bifurcati causes hair to intermittently split into two branches, each with its own outer layer.
October 2008 in “Experimental and Clinical Endocrinology & Diabetes” Long-term unemployment leads to higher stress levels.