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Wait 4-5 weeks after drug use before hair testing and cut hair into three segments to confirm single drug exposure.

Hair cortisol levels can show increased stress during late pregnancy but only for up to six months.

EtG levels in hair decrease significantly after one month of alcohol abstinence.

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.

Hair analysis can somewhat track past testosterone levels but is influenced by factors like hair washing, growth rate, sex, and hair color.

Hair cortisol levels can reflect salivary cortisol levels in humans.

Human hair surface varies in wettability, showing daily and monthly patterns.

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.

Hair cortisol may be a good indicator of recent mood in people with bipolar disorder.

THCCOOH levels in hair decrease from root to tip and don't match well with self-reported cannabis use.

Drugs localize differently in hair strands based on their properties.

Hair can reliably measure average estradiol levels over months in humans and monkeys.

Hair analysis alone can't confirm long-term drug exposure in children under 1 year old.

Segmental hair analysis can track testosterone over time but needs adjustments for sex, hair color, and washing frequency.

The method shows hair testosterone levels reflect those in saliva, but are affected by various factors and may indicate a risk for heart attack.

A new method was developed to extract and analyze proteins from very short human hairs.

The conclusion is that recognizing hair growth cycles can improve the precision of dietary and health assessments from hair analysis.

Cosmetic treatments like bleaching and perming can greatly reduce opiate levels in hair, possibly leading to false-negative drug tests.

Abnormal cuticle and hair shaft medulla cause hair loss in androgenetic alopecia; sonography helps diagnose and manage it.

Hair color and length affect metabolite profiles in hair, so they should be considered in hair analysis.

Hair cortisol and cortisone levels may affect how work stress influences depression in Chinese fishermen.

Muskox hair growth rates vary widely, so a single growth rate can't be used for all populations.

The research shows that a gene called Wnt3 affects hair growth and structure, causing short hair and balding when overactive.

Hair analysis can detect cocaine use but doesn't accurately show the amount or timing of use.

Hair elemental analysis could be useful for health and exposure assessment but requires more standardization and research.

Hair mineral analysis might help diagnose diseases early, but standard methods are needed.

Hair analysis for drugs needs a better understanding of how drugs enter hair, considering factors like hair structure and pigmentation.

Hair problems are common and distressing for women, but increasing knowledge of treatments offers hope.

Hair fibers interact through classical forces, which are influenced by treatments and products, important for hair care and other applications.

DHT stops hair regrowth in mice, similar to human hair loss.