Add Yahoo as a preferred source to see more of our stories on Google. A strand of hair contains three layers: the cuticle, cortex, and medulla. The design of the cuticle layer, in particular, is ...

Oxytocin levels can reflect long-term emotional connection, Ben-Gurion University study finds. The hormone oxytocin is known ...

For some time, studies have shown a link between elevated stress and obesity. Measuring cortisol levels in the hair may be a better way to evaluate chronic stress, since the hormone level will not ...

New research shows that cortisol and cortisone levels in the hair of people living with HIV were negatively associated with CD4 count, but not with HIV viral load. Among Chinese patients living with ...

Hair loss in women is driven by complex interactions between hormonal changes, hair follicle biology, and the hair growth ...

Measured via hair samples, long-term glucocorticoid exposure was linked to higher incidental cardiovascular disease risk. Long-term glucocorticoid levels measured via scalp hair are associated with ...

Do you anxiously stare in the mirror checking for errant gray hairs that are often the first signs of aging? While growing older is inevitable, some of us show the physical signs of aging earlier than ...