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research Influence of thermal hair straightening on cannabis and cocaine content in hair

23 citations , January 2016 in “Forensic Science International”

This study found that in vitro heat straightening of hair reduced THC and cocaine concentrations but increased CBN and BZE levels, suggesting heat conversion of these substances.

research Disappearance of Tramadol and THC-COOH in Hair After Discontinuation of Abuse. Two Different Profiles

7 citations , January 2019 in “Journal of Analytical Toxicology”

This study found that hair samples from chronic tramadol and cannabis users showed positive drug presence for 3-4 months and 6-7 months, respectively, after discontinuation.

research The impact of cannabis use on local anesthetic dosing during hair restoration surgery: a case report, proposed mechanisms, and clinical recommendations

March 2025 in “Journal of Dermatological Treatment”

In this case report, a patient required more local anesthetic than usual for hair transplant surgery, which the authors suggest may be due to cannabis use impacting pain sensitivity and anesthetic clearance.

research Hemp (Cannabis sativa L.) Phytochemicals and Their Potential in Agrochemical, Cosmetic, and Food Industries: A Review

January 2026 in “International Journal of Molecular Sciences”

This review discusses the diverse industrial applications of hemp beyond traditional fiber uses, highlighting its phytochemical components with antioxidant and antimicrobial properties that are explored in agrochemicals, cosmetics, and food sectors.

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.

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community Weed/THC effects on hair growth/hair loss, and vitality of organ-culture human follicle studies (research review)

4 upvotes 1 year ago

Cannabis and THC may have mixed effects on hair, with some studies suggesting potential negative impacts on hair growth in isolated hair follicles, but these results are hard to apply to living humans. Treatments like minoxidil and finasteride are commonly used for hair loss, and the effects of cannabis might be neutral or vary based on individual factors.

community How I recovered from 4+ years of severe balding ages 20-24 by dieting, lifestyle changes and ONLY using topical minoxidil

in Progress Pictures 473 upvotes 1 year ago

A user reversed severe hair loss with dieting, lifestyle changes, and topical minoxidil, highlighting reduced inflammation and body fat. The conversation debates finasteride's effectiveness and the impact of diet and lifestyle on hair health.

community Oral Minoxidil- Be Careful!!!!!

in Minoxidil 417 upvotes 1 year ago

Oral minoxidil can cause severe side effects, including heart issues, even at low doses. Users suggest starting with a lower dose or using topical treatments to minimize risks.

community Quit vaping/smoking = 80% less loss

in Research/Science 235 upvotes 2 years ago

Quitting vaping significantly reduced hair loss for a user who was a heavy vaper and also taking finasteride. Some participants suggest nicotine's vasoconstrictive properties may worsen hair loss, while others share personal anecdotes of hair improvement after quitting smoking or vaping.

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