The growth of human scalp hair mediated by visible red light laser and LED sources in males

    September 2013 in “Lasers in Surgery and Medicine
    Raymond J. Lanzafame, Raymond R. Blanche, Adam B. Bodian, Richard P. Chiacchierini, Adolfo Fernandez-Obregon, Eric R. Kazmirek
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    TLDR Red light therapy at 655 nm significantly improved hair growth in men with hair loss.
    A decade ago, a double-blind randomized controlled trial was conducted to determine the safety and physiological effects of Low Level Laser Therapy (LLLT) on males with androgenic alopecia. The study involved 44 males aged between 18 and 48 years. The participants were divided into two groups: the active group, which received a unit containing 21 lasers and 30 LEDs, and the placebo group, which received a unit with incandescent red lights. The treatment was administered at home every other day for 16 weeks. The results showed that 41 patients completed the study, with no adverse events or side effects reported. The active group showed a significant increase in hair counts from 142.0 ± 73.0 to 228.7 ± 102.8, representing a 39% increase in hair growth. The placebo group showed no significant change. The study concluded that LLLT of the scalp at 655 nm significantly improved hair counts in males with androgenetic alopecia.
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