At the end of each hair cycle
, some melanocytes become damaged and die.
STRESS: You've heard the expression "tearing your hair out" - and while stress hopefully won't drive you to such extremes, it has been known to affect the hair cycle
Major shifts in genomic activity accompany progression through different stages of the hair cycle
Several factors can cause alterations in your hair cycle
, resulting in increased shedding.
According to results presented at last year's annual meeting of the American Academy of Dermatology, a small-molecule hedgehog agonist, when topically applied to the skin, triggers the transition of hair follicles from the resting to growth phase of the hair cycle
This is the hair cycle
and it has 3 stages: Anagen, is the active growth period and its length varies from one person to another, lasting about 1,000 days or more; Catagen is the resting or intermediate period, lasting about 10 days; Telogen is the shedding period, lasting about 100 days.
The active part extends the growth phase of the hair cycle
and reduces hair loss, while the second has vitamins to protect and nourish the hair.
Human hair cycle
, Journal of Investigative Dermatology (1959) 33:307-316.
Over the past 50 years, scientists have pieced together the basic steps in the hair cycle
anywhere on the body.
Ki-67 is a protein expressed in the anagen phase of the hair cycle
It lengthens the growth phase of the hair cycle
and stimulates follicles that have become dormant due to hereditary thinning.