Each strand of hair has its own life cycle. Growth happens in four stages: anagen, catagen, telogen, and exogen. The hair ...

Scientists don't know exactly how minoxidil works. It may affect the different phases of the hair life cycle, thereby encouraging growth. It also opens up blood vessels near hair follicles.

Hormones play a major role in regulating the hair growth cycle. Estrogen and progesterone, predominant during pregnancy, ...