You shed more hair in the fall and spring than in summer and late winter in response to the changes in seasons and daylight exposure.
Asian men have little beard growth and a lower risk of developing androgenetic alopecia as, on average, they produce less testosterone than Caucasians.
On average, each person has 20 million hair follicles of which 90,000 to 140,000 are scalp hair follicles.
You can lose up to 25% of your scalp hair before it becomes noticeable.
Typically, scalp hair fibers grow for two to seven years before being replaced by a new hair fiber.
On average, healthy adult scalp hair fibers grow at 0.35mm per day.
Eyelashes are the slowest growing hair fibers at less than 0.16mm per day.
Chin hairs on young adult males are the fastest growing hair fibers at up to 0.42mm per day.
Women have a faster rate of hair growth on their scalps compared to men by about 0.02mm more per day.
The world's most expensive shampoo is arguably Alterna shampoo which contains caviar and costs $200 a bottle. Alterna is a favorite of the rich and famous and claims to have age-defying properties.