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The Hair Cycle & LLLT

The Hair Cycle & LLLT

How does laser therapy affect the hair cycle?

A basic understanding to the how hair grows is important to undertand how laser therapy affects that cycle.

Basics of Hair Growth in a Normal Hair Cycle

The hair follicle goes through three phases of growth and shedding, which are known as the anagen phase, catagen phase, and telogen phase.

  • Anagen phase: This is the active growth phase of the hair follicle, during which the hair grows rapidly from the root. This phase can last from 2 to 6 years, depending on the individual.
  • Catagen phase: This is a transitional phase that lasts for about 2 weeks. During this phase, the hair follicle begins to shrink and detach from the dermal papilla, which supplies it with nutrients.
  • Telogen phase: This is the resting phase of the hair follicle, which lasts for about 2 to 4 months. During this phase, the hair stops growing and remains attached to the follicle, but it is not firmly anchored in the scalp. Eventually, the old hair falls out and is replaced by a new hair, beginning the cycle again.

What role does laser therapy play in the hair cycle for hair growth?

It is believed that laser hair therapy is most effective during the anagen phase of hair growth, which is the active growth phase. This is because during the anagen phase, the hair follicle is most receptive to the laser's energy and the cells responsible for hair growth are actively dividing. The laser therapy works by stimulating blood flow and increasing the metabolism of cells in the hair follicle, which promotes healthy hair growth. It's worth noting that laser hair therapy can also be beneficial during the catagen and telogen phases, as it can help to rejuvenate hair follicles and prepare them for the next anagen phase. 

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