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High levels of cortisol in hair show long-term stress which can lower fertility in animals.

Older adults in Puerto Rico often couldn't be tested for hair cortisol due to refusal or lack of hair, with race and hair products affecting results.

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

Ancient hair can preserve hormones, revealing health and fertility insights.

Hair cortisol is a reliable marker of long-term cortisol levels and is linked to daytime saliva cortisol but not morning levels.

Monkey hair cortisol levels are not affected by how fast their hair grows.

Hair cortisol is a reliable stress indicator in cattle but may not be valid for pigs.

First-time mothers had higher stress hormone levels in late pregnancy than mothers who had given birth before.

Hair cortisol levels in primates are useful for stress assessment but vary by age, sex, species, and hair collection methods.

High hair cortisol levels indicate stress in cows due to poor shelter conditions and health issues.

Girls had higher stress hormone levels during school due to social and emotional issues, while boys had higher overall hormone levels with slight changes when school started.

The effects of estrogen on human scalp hair growth are unclear and need more research.

Monkeys with hair loss during pregnancy showed higher stress hormone levels and invested differently in their offspring.

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

Pig hair cortisol levels are inheritable and linked to stress responses, which could help select for more resilient pigs.

A new method accurately measures steroid hormones in a few hair strands and could help study chronic stress and hair loss.

Gender affects hair and scalp characteristics, with differences in hormone responses, graying patterns, and trace metals.

Vitamin A deficiency changes cattle hair structure, while pregnancy may improve it, suggesting hair can indicate cattle health.

Mothers have more hair proteins than their children, with age-related differences in protein patterns, and some proteins in hair could indicate early childhood development.

Many people experience hair loss after weight loss surgery, especially younger women, and it's linked to lower levels of zinc, folic acid, and ferritin.

Newborns' hair shows how much caffeine their mothers drank during pregnancy.

Human hair protein modifications could potentially indicate heart disease risk.

Measuring 17-hydroxyprogesterone in hair can help monitor androgen levels in people with congenital adrenal hyperplasia.

Goat hair shows changes in metal levels and stress when goats move from indoors to mountain pastures.

Chimp Haven uses a special system to check and improve the well-being of their chimpanzees, which could help other animal sanctuaries too.

People with Parkinson's disease have higher levels of cortisone in their hair, which may indicate chronic stress hormone dysfunction.

Monkeys with more anxious or inhibited temperaments tend to have less hair loss.

Hormones like androgens, estrogen, thyroid hormones, and stress hormones can contribute to hair loss, and treatments target these hormonal imbalances.

New hair growth corticosterone levels are higher in diabetic mice, indicating long-term stress.

PRP shows promise for treating hair loss, but more research is needed.