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 ...

For years, beauty culture created a very specific image of what “healthy hair” supposedly looks like. Perfectly smooth strands. No frizz. Endless shine. Hair moving dramatically in slow motion like it ...

Have you ever felt "off" and gotten bloodwork done, only to find out your results were all within the "normal" range? That can often happen with seemingly unexplainable symptoms like fatigue and hair ...

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 ...

In a study involving 11-year-olds, researchers have concluded that greater behavioral problems are linked to higher hair cortisol levels. The study also concluded that exposure to certain factors that ...