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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.
Treatment Time (seconds)
Irradiance/Power Density (mW/cm^2)
24 weeks, unknown schedule
Red 630-700 nm
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