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Low level laser therapy also known as light emitting diode or LED therapy is a safe & potentially effective hair loss treatment. It is best used to prevent hair loss, however there are limited studies to suggest that hair counts can increase by up to 39%. Treatment is life-long. Ideally low-level lasers should be combined with medical & surgical therapy including anti-androgens, PRP & follicular unit extraction.
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When will I see the results?
Within 4 months. Previous trials typically end at 16 weeks, with a few extending to 24 weeks. The best results to date have shown a 37% increase in follicular counts. Keep in mind that most studies are short term.

My advice? See a medical dermatologist for early adjunctive management of hair loss. A dermatologist can discuss & implement a long-term plan to help you retain your hair, & in most cases regrow.

How do lasers work to regrow hair?
Lasers, including low level laser therapy can reduce hair loss & regrow hair via the following mechanism-

Prolongs the growth or anagen cycle. This keeps your remaining hairs and prevents future hair loss / shedding.
Stimulates resting or telogen hairs to enter anagen
Stimulates new hair growth from stem cells & the dermal papillae
Reduces inflammation
Stimulates cytokines & growth factors