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Accurate quantitative bioanalysis using LC-MS/MS is challenging due to matrix effects, but using internal standards and new methods like in-sample calibration could improve results.

Cortisol and cortisone release from hair increases in steps over time during incubation.

New methods can detect finasteride's major urinary metabolite in urine for up to 49 hours.

Human hair is a significant sample for various tests in clinical, nutritional, archaeological, and forensic studies.

Human scalp hair follicles have PGE2 and its receptors, which might affect hair growth.

A new method accurately measures nine neuroactive steroids in small blood samples, helping to study brain diseases.

The method effectively identifies and measures seven banned substances in cosmetics.

LC-MS/MS is more reliable than immunoassays for diagnosing 21-hydroxylase deficiency.

The method accurately measures seven androgens in plasma and shows different hormone levels in females with acne and obesity.

Scientists found out how a specific protein in human hair cuticles behaves and is structured.

A yeast-based test can detect the steroid methyltestosterone in urine longer than traditional methods.

A new method accurately detects bisphenols and parabens in human hair.

The method can measure vitamin B3 levels in human hair accurately.

Key proteins and pathways regulate yak hair growth, with lipid metabolism aiding adaptation to high altitudes.

A new MBTPS2 gene variant disrupts fat metabolism and collagen production, causing Osteogenesis imperfecta.

Testosterone increases 3α-androstanediol levels, which can be blocked by finasteride.

New method effectively detects illegal hormones in anti-aging foods.

Standardized procedures are crucial for collecting and preparing biological samples to ensure accurate clinical metabolomics results.

The methods accurately measured brain androgens, showing most 5α-androstane-3α,17β-diol comes from outside the brain, while androsterone is both transported and made in the brain.

The study developed a method to analyze ancient hair proteins using very small samples.

The caffeine content in anticellulite gels is 0.7-1.7% and in hair-care products is about 1.0%.

A new method accurately measures finasteride levels in human plasma.

A new method was developed to analyze certain hormones and drugs in human blood efficiently.

A new method accurately measures nine specific hormones in human blood.

The new LC-MS/MS method is more accurate and reliable than traditional immunoassays for measuring steroids in serum.

Hair cortisol and cortisone levels increase with age, are higher in diabetics, vary by gender, decrease with frequent hair washing, and are lower in winter.

The method shows that zinc pyrithione and climbazole from anti-dandruff shampoo effectively reach the scalp.

Tramadol and THC-COOH can be detected in hair for several months after stopping use.

Hair steroid measurement is an effective method to diagnose and monitor CAH in developing countries.

DHEA is the main sex steroid in cerebrospinal fluid, and testosterone in the fluid comes from the blood.