Efficacy and Safety of a Low-Level Light Therapy for Androgenetic Alopecia: A 24-Week, Randomized, Double-Blind, Self-Comparison, Sham Device-Controlled Trial.
650
(laser)
+
660
(LED)
“A significant increase in hair coverage from baseline was observed for the LLLT-treated side after a 24-week treatment (p < .001).
In contrast, the control side showed a decrease in hair coverage from baseline at the 24-week visit (p = .002)”
https://www.ncbi.nlm.nih.gov/pubmed/29957664
Researchers applied 660 nm LED light to balding men and women over a 24 week study.
The light therapy significantly increased the hair’s coverage area.
More of the subject’s heads had hair at 24 weeks than at the beginning of the study.
The sham group saw no hair gains.
Researchers also used 650 nm red laser light, and got the same results.
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