Can red light therapy help with hair loss?

Yes, red light therapy is one of the more evidence-backed non-pharmaceutical treatments for hair loss. The FDA has cleared multiple low-level laser therapy (LLLT) devices specifically for treating androgenetic alopecia — the most common form of hair loss — in both men and women. Clinical trials published in the American Journal of Clinical Dermatology and Lasers in Surgery and Medicine show statistically significant increases in hair count, hair density, and hair thickness compared to sham (placebo) devices. The mechanism involves stimulating hair follicle stem cells, increasing blood flow to the scalp, extending the anagen (growth) phase of the hair cycle, and reducing inflammation around follicles. Most effective protocols use wavelengths between 650nm and 670nm at specific power densities, applied to the scalp 3 times per week for a minimum of 16 to 26 weeks. Results are gradual — most patients notice reduced shedding within 8 to 12 weeks, with visible regrowth becoming apparent by 16 to 24 weeks. Red light therapy works best for early to moderate hair loss and can be combined with other treatments like minoxidil for enhanced results. It is less effective for complete baldness where follicles have been dormant for extended periods.

Reviewed by Chad Waldman, Analytical Chemist · Last updated May 2026

About Red Light Therapy

Red (630-660nm) and near-infrared (810-850nm) light is absorbed by cytochrome c oxidase in mitochondria, enhancing electron transport chain activity, increasing ATP production, and modulating reactive oxygen species signaling.