Red light therapy (RLT), also known as low-level laser therapy (LLLT), has gained attention as a potential treatment for hair loss. But does it really work? Let’s examine the scientific evidence.
Key Studies on Red Light Therapy for Hair Growth
1. 2013 Clinical Trial (Lasers in Surgery and Medicine)
- Participants: 41 men and women with androgenetic alopecia (pattern hair loss).
- Method: Used a laser comb (655 nm) 3 times per week for 26 weeks.
- Results:
- 35% increase in hair density in the treatment group.
- No significant improvement in the placebo group.
- Conclusion: LLLT can promote hair growth in both men and women.
2. 2014 Study (American Journal of Clinical Dermatology)
- Participants: 44 men with male pattern baldness.
- Method: Used a laser helmet (650 nm) every other day for 16 weeks.
- Results:
- 39% increase in hair count compared to baseline.
- No serious side effects reported.
- Conclusion: LLLT is a safe and effective treatment for androgenetic alopecia.
3. 2017 Meta-Analysis (Journal of Cosmetic and Laser Therapy)
- Reviewed 11 clinical trials on LLLT for hair loss.
- Findings:
- Most studies showed significant improvement in hair density and thickness.
- Best results seen with wavelengths between 630-670 nm.
- Requires consistent use (3-5x per week for 4-6 months).
4. 2019 Study (Dermatologic Surgery)
- Participants: 30 women with female pattern hair loss.
- Method: Used a red light cap (650 nm) 3x per week for 25 weeks.
- Results:
- 51% increase in hair density in the treatment group.
- Improved hair thickness and reduced shedding.
How Does Red Light Therapy Work for Hair Growth?
The mechanism is believed to involve:
Stimulating ATP production (boosts follicle energy).
Increasing blood flow (more oxygen & nutrients to hair roots).
Reducing inflammation (linked to hair loss conditions).
Prolonging the anagen (growth) phase of hair cycles.
Is Red Light Therapy FDA-Approved?
- Yes! Some devices (e.g., HairMax LaserComb) are FDA-cleared for treating androgenetic alopecia.
- However, results vary—some people respond better than others.
Final Verdict: Does It Work?
✔ Strong evidence supports RLT for hair regrowth, especially for androgenetic alopecia.
✔ Best results require consistent, long-term use (3-6 months).
✔ Works best when combined with minoxidil, microneedling, or a healthy diet.