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research Hair as a retrospective calendar of cortisol production—Increased cortisol incorporation into hair in the third trimester of pregnancy

501 citations , October 2008 in “Psychoneuroendocrinology”

This study suggests that cortisol measured in human hair can effectively reflect increased production for up to six months, but its retrospective accuracy may be limited due to rapid decline in levels.

research Segmental Hair Analysis for 11-Nor- 9-Tetrahydrocannabinol-9-Carboxylic Acid and the Patterns of Cannabis Use

30 citations , March 2012 in “Journal of Analytical Toxicology”

This study found that concentrations of THCCOOH in hair do not correlate well with self-reported cannabis use due to inaccuracies in the self-reported data, but it provides preliminary insights into usage patterns.

research Segmental hair analysis as a retrospective testosterone diary: possibilities and pitfalls

September 2023 in “Scientific reports”

This study observed that testosterone concentrations in hair segments show some stability over time, but are influenced by factors like sebum integration, hair washing frequency, and individual hair growth rates.

research Segmental hair analysis - a retrospective testosterone diary?

July 2022 in “Research Square (Research Square)”

This study found that hair testosterone concentrations show some consistency over time, but factors like hair washing and individual growth rates influence these levels, suggesting the need for careful sampling and analysis adjustments.

research An evaluation of distal hair cortisol concentrations collected at delivery

January 2018

This study found low concordance between distal and proximal hair cortisol concentrations during early pregnancy, particularly when measured with different assay methods.

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Community Join

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community Most Underrated Hack for Hair Loss is Water

in Chat 68 upvotes 8 months ago

Filtered shower heads may improve scalp and hair health but do not affect male pattern baldness (MPB). Genetics and factors like DHT and scalp tension are more significant in hair loss.

community Does age play a role in how you respond to 5AR inhibitors? (finasteride/dutasteride)

in Research/Science 24 upvotes 2 years ago

The conversation discusses whether age affects the side effects and effectiveness of hair loss treatments like finasteride and dutasteride. Some believe early treatment yields better results, while others mention varied outcomes across ages and personal regrowth experiences without a clear consensus on age impact.

community 2 months and a half on min + fin

846 upvotes 1 year ago

The user has been using topical minoxidil, oral finasteride, and nizoral shampoo for almost three months, along with supplements like biotin and vitamin D3, and reports noticeable hair regrowth without side effects. They aim to have more hair for a wedding in June and are considering using hair fibers for temporary enhancement.

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Experts

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SMP Specialist
Hairo Fallas
Newark, NJ, United States

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Hairo Fallas