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Glossary Hair Samples

small sections of hair collected for scientific analysis

Hair samples, also known as hair specimens or hair strands, are small sections of hair collected for analysis. These samples can be used in various fields such as forensic science for DNA testing, toxicology to detect drug use, and medical diagnostics to assess nutritional deficiencies or hormonal imbalances.

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Research

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research Collecting Hair Samples for Hair Cortisol Analysis in African Americans

44 citations , June 2018 in “Journal of Visualized Experiments”

This paper presents a culturally informed protocol designed to improve the collection of hair samples from African Americans for cortisol measurement, illustrating its application with community-based study data.

research A simple method using ex vivo culture of hair follicle tissue to investigate intrinsic circadian characteristics in humans

12 citations , July 2017 in “Scientific reports”

In this study, researchers developed a simple, non-invasive method to monitor circadian gene expression using whole hair root cultures, finding that elderly dementia patients' peripheral clocks still oscillate similarly to younger, healthier individuals, which suggests cellular senescence minimally affects some aspects of circadian rhythms.

research What is the best sampling region for endocrine hair analysis? A comparison between the posterior vertex and occipital region and recommendation for standardization

9 citations , April 2025 in “Psychoneuroendocrinology”

This study found no consistent differences between the posterior vertex and occipital region for hair hormone analysis, but noted significant variations in specific hormone concentrations, highlighting the need for standardized sampling practices.

research Hair sampling for cortisol analysis with mother-toddler dyads living in low-income homes

8 citations , October 2020 in “Infant behavior & development”

This study found that sampling hair for cortisol analysis in mother-toddler dyads living in low-income U.S. homes is feasible, with 66% of approached dyads participating.

research Examining the acceptability of providing hair or fingernail samples as a biomarker of physiological stress among older adolescents.

April 2026 in “PsyArXiv (OSF Preprints)”

This study found that among young adults, willingness to provide hair and fingernail samples for cortisol measurement was similar, with discomfort around sampling as the main barrier; informational videos did not significantly alter participant willingness.

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Community Join

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community Creatine & Hair Loss — My Personal Experience (And a Bit of Simple Math)

71 upvotes 1 year ago

Creatine may accelerate hair loss in those genetically predisposed, with some users reporting increased shedding while taking it and improvement after stopping. Some users use treatments like finasteride and minoxidil, while opinions on creatine's impact vary.

community Scientists have uncovered a simple way to cure hair loss – as incredible before–and–after photos show the results in just 8 weeks

in Research/Science 283 upvotes 11 months ago

Scientists claim a combination of caffeine, two proteins, and Centella asiatica extracts can cure hair loss, but skepticism remains due to past unfulfilled promises. Users discuss various treatments like minoxidil, finasteride, and microneedling, expressing doubt about the effectiveness of new methods.

community Simple to add GHK-Cu to RU58841?

1 upvotes 1 year ago

The conversation is about a user seeking advice on adding GHK-Cu to RU58841 for hair loss treatment, while already using oral minoxidil, dutasteride, ketoconazole shampoo, and considering LLLT. They are unsure about the concentration and carrier solution for GHK-Cu.

community New Hair Loss Treatment: Adipose Derived Secretomes

18 upvotes 1 year ago

Adipose-derived stem cell secretome showed significant improvement in hair density and growth, especially when combined with minoxidil, suggesting a synergistic effect. The study had limitations, including a small sample size and potential bias.

community Hair loss stack thoughts? New to this!

in Treatment 2 upvotes 8 months ago

The conversation is about a hair loss treatment plan involving finasteride, minoxidil, microneedling, GHK-CU injections, Nizoral shampoo, and RU58841. The user is advised to start with a simpler regimen to minimize side effects and assess effectiveness before adding more treatments.

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