Low-level laser therapy for the treatment of androgenetic alopecia in Thai men and women: a 24-week, randomized, double-blind, sham device-controlled trial.

What the authors concluded

Thirty-six subjects (19 in the laser group and 17 in the sham group) completed the study. At week 24, the laser helmet was significantly superior to the sham device for increasing hair density and hair diameter (p = 0.002 and p = 0.009, respectively) and showed a significantly greater improvement in global photographic assessment by investigators and subjects. Reported side effects included tempo

Devices that emit this wavelength

Matched on wavelength within 15nm, since LED bins vary by roughly that much and a tighter match would be false precision. Where we have an irradiance figure, the session length is the time needed to reach this study's dose of 4 J/cm² at that intensity.

Matching a wavelength is not the same as reproducing a trial. Session times assume the device's published irradiance is accurate at the distance it was measured, which on brand-claim figures is often optimistic. Where a device publishes both a peak and an average we use the average, and where it publishes a falloff curve we use the lowest figure, so these times run long rather than short. Clinical protocols also control for spot size, contact and skin type in ways a home device cannot.