The Use of Phototherapy with Different Wave- Lengths in The Treatment of Androgenetic Alopecia

Silva LF and Baptista A

Published on: 2025-03-10

Abstract

Introduction: Phototherapy has been identified as a safe, non-invasive, and promising resource for the treatment of Androgenetic Alopecia (AGA). The aim of this study was to evaluate the effects of photo- therapy on the treatment of AGA using two different wavelengths: red and blue. Both red and blue light, under the parameters tested in this study, allowed an increase in hair density, a reduction in the central parting, and promoted an increase in the number of terminal hairs after the treatments, as well as a reduction in vellus hairs.

Methodology: Ten volunteers were selected (GLV n=5) and (GLA N=5), all diagnosed with AGA and approved by the ethics committee with opinion number 5,761,579. Interventions were carried out using Venus’s equipment (MMOptics, Sao Carlos, Brazil) with Group GLV λ=660nm, 4J and Group GLA λ=440 nm, 4J. The interventions were performed once a week, for 90 days, totaling 12 treatment sessions. Hair progression was assessed by photographic record and the ratio of vellus to terminal hairs was performed by digital trichoscopy imaging (Dino Lite; New Taipei City, Taiwan, China).

Results and Conclusion: Both red and blue light, under the parameters tested in this study, allowed an increase in hair density, a reduction in the central parting, and promoted an increase in the number of terminal hairs after the treatments, as well as a reduction in vellus hairs.