Photobiomodulation and hair growth

Molly B. Hirt, Ronda S. Farah

Research output: Chapter in Book/Report/Conference proceedingChapter


Since the initial Food and Drug Administration clearance of the first photobiomodulation device for androgenetic alopecia in 2007, the market for these devices has rapidly expanded. Sixteen unique devices are currently available to consumers with varying designs, treatment durations and frequency. While the precise mechanism for hair growth stimulation remains to be elucidated, current evidence suggests the laser light alters hair cycle duration to promote the anagen growth phase. Photobiomodulation devices have an excellent safety profile with pruritus and skin dryness reported to be the most common side effects. Overall, research has demonstrated clinical efficacy of these devices, including randomized controlled studies. As photobiomodulation continues to emerge as a treatment modality for androgenetic alopecia, additional information on the most effective light sources, precise light wavelength, treatment schedule, and effectiveness on various hair diseases is still needed.

Original languageEnglish (US)
Title of host publicationLasers in dermatology and medicine
Subtitle of host publicationdermatologic applications
PublisherSpringer International Publishing
Number of pages8
ISBN (Electronic)9783319761183
ISBN (Print)9783319761169
StatePublished - Jun 6 2018


  • Alopecia
  • Androgenetic alopecia (AGA)
  • Hair growth
  • Laser
  • Light-emitting diodes
  • Low-level laser therapy (LLLT)
  • Photobiomodulation (PBM)

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