How it works
Low-level red laser light is intended to deliver photobiomodulation to scalp follicles. Proposed effects include altered cellular signalling and prolongation of the anagen growth phase; device wavelength, irradiance, coverage and schedule determine exposure.
Regulatory status: manufacturer states FDA clearance for androgenetic hair loss in Fitzpatrick skin types I-IV; exact clearance should be checked against the device labelling
Mechanism evidence: human