Hair is grown from the root, which is underneath the skin and embedded in a bag-like structure called follicle. Tiny blood capillaries convey the necessary nutrients to the base of the follicle called papilla where the manufacture of hair takes place. Adjacent and attached to the follicle is the sebaceous gland that secretes an oily substance called sebum, which is for the lubrication and protection of the skin and hair. The color to the hair is being given by the melanin pigments which are synthesized by a special cell in the scalp.

The main cause of hair loss is DHT. DHT is synthesized from male sex hormone testosterone and plays a major role in hair loss by shrinking the hair follicles. People whose follicles are sensitive to DHT will respond, men more commonly than women, and result in a shorter lifespan and the abnormal production of hair.

The most important part of the hair follicle is the dermal papilla (papilla of hair), which is responsible for the growth of hair. When DHT gets to the dermal papilla, it undermines the absorption of vital nutrients required for healthy hair follicles. Without proper nutrition, healthy life cycle breaks and their resting stages get longer while their growing phases get shorter resulting thinning and immature production of hair.