There are many new low-level
laser technologies that have been released commercially that claim to support hair regrowth. In this paper, we will examine the clinical trials to determine whether the body of evidence supports the use of
low-level laser therapy (
LLLT) to treat
androgenic alopecia (AGA). A literature search was conducted through Pubmed, Embase, and Clinicaltrials.gov for clinical trials using
LLLT to treat AGA. Thirteen clinical trials were assessed. Review articles were not included. Ten of 11 trials demonstrated significant improvement of
androgenic alopecia in comparison to baseline or controls when treated with
LLLT. In the remaining study, improvement in hair counts and hair diameter was recorded, but did not reach statistical significance. Two trials did not include statistical analysis, but showed marked improvement by hair count or by photographic evidence. Two trials showed efficacy for
LLLT in combination with topical
minoxidil. One trial showed efficacy when accompanying
finasteride treatment.
LLLT appears to be a safe, alternative treatment for patients with
androgenic alopecia. Clinical trials have indicated efficacy for
androgenic alopecia in both men and women. It may be used independently or as an adjuvant of
minoxidil or
finasteride. More research needs to be undertaken to determine the optimal power and wavelength to use in
LLLT as well as
LLLT's mechanism of action.