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If you’re struggling with hair loss or thinning, you’ve likely come across red light therapy as a potential solution. But does it really work? Let’s dive into the scientific evidence behind this innovative treatment.

What is Red Light Therapy?

Red light therapy, also known as low-level light therapy (LLLT) or photobiomodulation, involves exposing the scalp to specific wavelengths of red light. This light is absorbed by cells, stimulating various biological processes that can promote hair growth.

The Science Behind Red Light Therapy for Hair Growth

Numerous studies have explored the effects of red light therapy on hair growth, and the results are promising. Here’s a look at some of the key findings:

  1. Increased Hair Density and Growth A 2019 meta-analysis published in the Journal of Cosmetic and Laser Therapy examined eight clinical studies involving 11 double-blind, randomized controlled trials. The analysis showed a significant increase in hair density for individuals treated with red light therapy compared to those receiving sham or placebo treatments.
  2. Superior to Hair Growth Drugs A 2018 meta-analysis published in the American Journal of Clinical Dermatology reviewed recent advances in non-surgical treatments for hair loss. After comparing red light therapy to hormone-regulating drugs like finasteride and dutasteride, the researchers concluded that red light therapy was a superior treatment, with no reported side effects.
  3. Stimulates Hair Follicle Proliferation A study published in the journal Lasers in Surgery and Medicine found that red light therapy stimulated the proliferation of human hair follicles in an ex vivo culture model. The treatment increased the length of the hair shaft and the expression of the cell proliferation marker Ki67, indicating enhanced hair growth.
  4. Promotes Hair Growth in Both Men and Women Several studies have demonstrated the effectiveness of red light therapy for both male and female pattern baldness. A 2017 trial published in Lasers in Surgery and Medicine reported a 51% increase in hair counts for women receiving red light therapy at 650 nm . Similarly, a study by Lanzafame et al. showed significant improvements in hair counts for men and women affected by androgenetic alopecia (AGA) when treated with 655 nm red light.

Mechanisms of Action

While the exact mechanisms behind red light therapy’s hair growth-promoting effects are still being investigated, several potential pathways have been proposed:

  1. Increased Cellular Energy Production: Red light therapy has been shown to enhance mitochondrial function, leading to increased ATP production and improved cellular energy utilization, which may support hair follicle growth and activity.
  2. Reduced Inflammation and Oxidative Stress: Red light therapy has demonstrated anti-inflammatory and antioxidant properties, which can create a more favorable environment for hair growth by reducing inflammation and oxidative stress in the scalp.
  3. Improved Blood Flow and Nutrient Delivery: Some studies suggest that red light therapy can increase blood flow and oxygen delivery to the scalp, providing essential nutrients to support hair follicle health and growth.

While more research is still needed to fully understand the mechanisms behind red light therapy’s effects on hair growth, the existing evidence is promising and suggests that this non-invasive treatment may be a valuable addition to hair loss management strategies.

It’s important to note that red light therapy should not be viewed as a standalone solution for hair loss but rather as a complementary approach to be integrated with other evidence-based treatments and a healthy lifestyle. As with any medical treatment, it is essential to consult with a qualified healthcare professional before incorporating red light therapy into your hair care routine.


  1. Journal of Cosmetic and Laser Therapy: Meta-analysis on Red Light Therapy for Hair Density
  2. American Journal of Clinical Dermatology: Review on Non-Surgical Hair Loss Treatments
  3. NCBI: Study on Red Light Therapy Stimulating Hair Follicles
  4. Lasers in Surgery and Medicine: Trial on Red Light Therapy for Women
  5. ResearchGate: Study on Visible Red Light for Hair Growth

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