The catagen phase (regression phase): This transitional phase signals the end of active growth and lasts about 2-3 weeks. The hair follicle shrinks and detaches from the dermal papilla.

The structure of a single hair is much more complex than what you can see growing from your head. Each strand is anchored in a hair follicle, an opening in the skin that extends several layers.

Understanding the difference between natural hair shedding and pathological hair loss for healthier hair care By Cameron French Mar 01, 2025 5:15 pm Photo credit: Shutterstock.com / F01 PHOTO ...

Several different factors might explain why you might be going gray in your 20s. Here's what you need to know about the ...

You’ve had straight hair your whole life. It dried flat, fell neatly without effort, and never held a curl unless you forced it to. But recently, you’ve noticed something strange. Your hair has ...

Hair Structure 101 Every strand of hair is composed of three layers: the outer layer (cuticle), the middle layer (the cortex), and the innermost layer (the medulla). The medulla is a container for ...

Treating hair loss with transforming growth factor β2 can reduce the activity of the germinal matrix cells, which are responsible for new hair growth. Activation of TRβ, Expression of Cyclin D1 ...

To some extent, hair loss is normal. "On average, a person sheds between 50-to-150 hairs a day," Hannah Gaboardi, a highly experienced trichologist and hair health expert, tells Bazaar.

Every item on this page was chosen by a Town & Country editor. We may earn commission on some of the items you choose to buy. Hair loss, particularly for women, can be brutal.

Human induced pluripotent stem cell (hiPSC)-derived skin organoids (SKOs) generate sweat and sebaceous glands when differentiated using air-liquid interface conditions. a) Representative bright ...

And it may sound obvious − but make sure to read the directions very carefully. Leaving bleach on your hair for too long can lead to serious damage. How long you should leave bleach on your hair ...