Hereditary hair thinning is usually triggered by a combination of hormonal activity and heredity, which together cause the hair follicles in your scalp to shrink. This condition is called androgenetic alopecia, and it can start in the teens, 20s, 30s, or 40s. Over time, this progressive shrinking of certain scalp follicles leads to a shortening of the hair's growing cycle — until there is no growth at all.

Hereditary hair thinning accounts for most cases of hair thinning. (Less common causes include certain medications and medical conditions; you should see your doctor if you suspect your hair thinning is caused by something other than heredity.) Typically, members of your family also have hair loss or thinning of varying degrees.

But this family tradition can stop now. The sooner you start using Women's Rogaine, the sooner it can get to work — inside your scalp — to revitalize follicles and stimulate hair regrowth.