Enhanced Hair Regrowth Through Dual-Wavelength Low-Level Laser Therapy: A Comparative Study on Mice

February 2025 in “ Journal of Biophotonics ”

He Gao, Yao Liu, Zhaiyi Liu, Peichao Wang, Zhao-yin Qin, Shuanglin Liao, Mo Jia, Lin Wang, Hsiang‐Chen Chui

low-level laser therapy dual-wavelength LED wavelengths hair regrowth surface image analysis histological examination LLLT

Studysummary This study found that using dual-wavelength low-level laser therapy is more effective for hair regrowth in mice than single-wavelength treatment and significantly better than no treatment, based on 14 days of phototherapy with LED lights. Our plain-language summary of this paper — not a Tressless recommendation.

The study investigates the effectiveness of dual-wavelength low-level laser therapy (LLLT) on hair regrowth in mice, using light-emitting diodes (LEDs) at 670, 680, 780, and 880 nm. Conducted over 14 days, the research compared dual-wavelength combinations to single-wavelength treatments and an untreated control group. Results from surface image analysis and histological examination showed that dual-wavelength therapy significantly enhances hair regrowth compared to single-wavelength treatment and the control, suggesting its potential for improved hair regrowth. The authors reported no conflicts of interest.

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