From the Research
Red light therapy is a viable treatment option for promoting hair growth, particularly for androgenetic alopecia, as evidenced by the most recent and highest quality study published in 2021 1.
Key Findings
- The study found that low-level 650 nm red light promoted the proliferation of human hair follicles in an experimental cultured-tissue model.
- Red light therapy significantly delayed the transition of hair cycle from anagen to catagen in vitro.
- RNA-seq analysis and gene clustering for the differentially expressed genes suggest that leukocyte transendothelial migration, metabolism, adherens junction, and other biological processes may be involved in the stimulation of hair follicles by 650-nm red light treatment.
Treatment Recommendations
- For best results, consistent use of red light therapy is recommended, typically 3-5 times weekly for at least 3-6 months.
- Home devices, such as caps, combs, or panels, and professional treatments available at dermatology clinics can be used.
- Most devices require 8-15 minutes per session.
Mechanism of Action
- Red light therapy works by energizing cells in hair follicles, specifically targeting the mitochondria to produce more ATP (cellular energy), which may help transition dormant follicles into an active growth phase.
Safety and Efficacy
- Side effects are minimal, making it a safe option to try, though it shouldn't replace medical evaluation for underlying hair loss causes.
- The treatment appears most effective for androgenetic alopecia (pattern baldness) and may work better when combined with other treatments like minoxidil, as supported by a recent review of medical and procedural treatments for androgenetic alopecia published in 2023 2.