What is common baldness?
Testosterone plays an important role in hair loss. When combined with another enzyme in the hair follicle, 5 alpha reductase, testosterone converts to Dihydrotestosterone (DHT).
This hormone is a natural metabolite of the human body and is very potent androgen belonging to the class of compounds called androgenic hormones.
The hair follicle when exposed to long periods of DHT eventually miniaturizes and dies.
Hair Loss and Its Causes
Hair follicles go through three stages. The normal cycle of hair growth lasts for 2 to 6 years. This stage is called the Anagen stage. During this stage hair will grow approximately one (1) centimeter (less than half an inch) per month. About 90 percent of the hair on your scalp is growing at any one time.
About 10 percent of the hair on your scalp is in the involution phase, also called the Catagen phase which lasts about 2 weeks. The hair then enters the Telogen or resting phase for 2 to 3 months.
During the end of the resting phase hair follicles falls out and a new hair starts.
The most important structure of a hair follicle is the dermal papilla, which is responsible for hair growth.
The cell of this dermal papilla divides and differentiates to form a new hair follicle. As this dermal papilla lies in direct contact with blood capillaries of the skin, it is responsible for deriving nutrients for hair follicle growth.
This dermal papilla has many receptors for androgens; where men have more androgenic receptors here than women.
porosity is the hairs ability in to absorb moisture. Determined by the cuticle layer of the hair.
when scales are closed it is rated as low porosity, when hair is like this hair is more resistant to perms and relaxer along with hair colour.
hight porosity is when the cuticle is open, making the absorb great amount of moisture. easier for perms and relaxers.