Hair Growth Cycle And The Results Of Laser Hair Removal

Hair growth cycles has three distinct growth phases : 1. Active Growth Phase ;  2. Regressive Phase ;  3. Resting Phase

Medical research has conclusively shown that hair growth cycles differ on various parts of the body. The laser most effectively disables hair that is in the 1. Active Growth (Anagen) Phase. Below, we take a look at the various hair growth cycle and the effects of laser hair removal treatment.

1. Active Growth Phase (Anagen Phase)

It is the PERFECT stage for laser hair removal treatment and it is the ONLY during this stage that we can permanently disable hair growth. The Anagen phase will lasts for 2-7 years and is genetically determined. At any given time, 85% of our body hair is in this phase.

1. Active growth phase (Anagen phase)


During Anagen, the hair follicle is directly connected to the blood vessels and the hair has an abundance of melanin. Anagen phase is the best effectiveness of laser treatment because the laser target is just in the melanin of the hair. Laser will cut off the blood supply to hairs and all the hair in the target area will be affected but only the hair follicles in the Anagen phase will be permanently disabled.

Laser hair reduction treatments are done over time because there are not 100% of the hairs in the Anagen phase, but levels approximating 80 to 90% permanent is possible.

Hair Growth Cycle And The Results Of Laser Hair Reduction

Regressive phase (Catagen phase)

2. Regressive Phase (Catagen Phase)


The Catagen phase will lasts about 2-3 weeks, during which the hair stops growing but is not yet shed. The growth process has reversed itself and the hair is getting ready to shed. It is no longer connected to the blood supply and the moisture, water and salt have begun to dry up.

In the phase, the hair is not visible and capable of absorbing the laser light and therefore can not be destroyed. About 3 - 4% of our body hair is in this phase at any given time.

Resting phase (Telogen phase)

3. Resting Phase (Telogen Phase)

Hair is no longer connected to anything and it is preparing to fall out. For laser treatment the hair shaft is fully detached from the papilla, thus not allowing the laser to attack the melanin in the shaft and disable the papilla. The hair is not visible and capable of absorbing the laser light and therefore cannot be destroyed.

The Telogen phase will lasts 5 - 6 weeks, at the end of which the hair falls out and a new hair begins to form. Approximately 10-13% of our body hair is in this phase at any one time.

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