Evaluation of the Activity of Laser Light Doses Compared to an Inactive Control Dose on Ex Vivo Hair Growth

February 2010 in “ Journal of The American Academy of Dermatology ”

low-level laser therapy LLLT laser wavelengths hair follicles ex vivo hair growth 635nm wavelength 660nm wavelength laser energy laser therapy laser treatment

TLDR Low-level laser therapy increased hair growth compared to no treatment.

The document reports on a study that evaluated the effect of low-level laser therapy (LLLT) on ex vivo hair growth using different wavelengths of laser energy. The study was an ex vivo experiment using hair follicles from a 58-year-old man, which were cultured and exposed to laser wavelengths of 635nm, 660nm, a combination of both, or a control (inactive dose). The hair growth was measured over a period of 10 days. The results showed that hair follicles exposed to the 635nm wavelength had a mean growth of 697µm at day 10, while those exposed to the 660nm wavelength had a mean growth of 533µm, and the combined wavelengths also resulted in a mean growth of 533µm at day 10. In contrast, the control group only showed a mean growth of 432µm at day 10. The study concluded that there was a significant increase in the rate of hair growth in the follicles exposed to LLLT compared to the control group, suggesting that LLLT could be effective in stimulating hair growth.

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