Hair is more than just appearance—it reflects vitality, identity, and confidence. Yet when it begins to thin or shed, the change is felt deeply, often becoming one of the earliest and most visible signs of aging.

Seasonal shifts can accelerate this concern. After summer, many people notice their hair feels drier, weaker, or more brittle due to prolonged sun exposure, heat, and environmental stressors. This seasonal fragility can make underlying hair loss or thinning even more noticeable, driving an urgent search for solutions that go beyond surface repair.

The hair care industry offers no shortage of options—from costly surgical interventions to topical formulas that promise more than they deliver. But when filtered through the lens of safe, effective, and clinically proven results, the list becomes far shorter. Consumers are left balancing hope with hesitation, often spending significant amounts of time and money with little lasting impact.

This is where Light Therapy stands apart. By applying precise wavelengths of red and near-infrared light directly to the scalp, it works at the cellular level to energize hair follicle cells, stimulate blood flow, and reduce inflammation—all conditions that support stronger, more resilient growth. Decades of clinical evidence confirm its safety and efficacy, and FDA recognition underscores its role as one of the very few scientifically validated methods to address hair loss.

With this context in mind, we now turn to the clinical research itself—studies that demonstrate exactly how and why Light Therapy is reshaping the future of hair health.

‍The Clinical Science of Light Stimulated Hair Growth

1. Featured Clinical Study | The growth of human scalp hair in females using visible red light laser and LED sources

[Read Here]

At a glance: 

- Clinical Trial | double-blind randomized controlled trial published in ‘Lasers Surgery & Medicines’

- Background: Low level laser (light) therapy (LLLT) has been demonstrated to promote hair growth in males. A double-blind randomized controlled trial was undertaken to define the safety and physiologic effects of LLLT on females with androgenic alopecia.

- Results: Forty-two patients completed the study (24 active, 18 sham). No adverse events or side effects were reported. Baseline hair counts were 228.2 ± 133.4 (N = 18) in the sham and 209.6 ± 118.5 (N = 24) in the active group (P = 0.642). Post Treatment hair counts were 252.1 ± 143.3 (N = 18) in the sham group and 309.9 ± 166.6 (N = 24) in the active group (P = 0.235). The change in hair counts over baseline was 23.9 ± 30.1 (N = 18) in the sham group and 100.3 ± 53.4 (N = 24) in the active group (P < 0.0001). The percent hair increase over the duration of the study was 11.05 ± 48.30 (N = 18) for the sham group and 48.07 ± 17.61 (N = 24) for the active group (P < 0.001). This demonstrates a 37% increase in hair growth in the active treatment group as compared to the placebo group.

- Conclusion: LLLT of the scalp at 655 nm significantly improved hair counts in women with androgenetic alopecia at a rate similar to that observed in males using the same parameters.‍

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2. Featured Clinical Review | Photodynamic and photobiological effects of light-emitting diode (LED) therapy in dermatological disease: an update

‍[Read Here]

At a glance: 

• Clinical Review | 2018 Clinical review in Lasers in Medical Science
• Abstract: Benefit deriving from the use of light is known since ancient time, but, only in the last decades of twentieth century, we witnessed the rapid expansion of knowledge and techniques. Light-emitted diode (LED)-based devices represent the emerging and safest tool for the treatment of many conditions such as skin inflammatory conditions, aging, and disorders linked to hair growth. The present work reviews the current knowledge about LED-based therapeutic approaches in different skin and hair disorders. LED therapy represents the emerging and safest tool for the treatment of many conditions such as skin inflammatory conditions, aging, and disorders linked to hair growth. The use of LED in the treatment of such conditions has now entered common practice among dermatologists. Additional controlled studies are still needed to corroborate the efficacy of such kind of treatment.

Figure 3. Representative image of LED therapy on androgenetic alopecia. a Miniaturized hair follicle; b treatment with red light (630 nm); healthy hair follicle

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Blog Discussion: 

Today, we have taken a look at two selected pieces of scientific literature dealing with Hair Growth: a clinical study and a clinical review. Before we discuss the field at whole, let’s summarize the findings of both to adequately ground us in the scientific realities of Light Therapy and Hair growth.

The first is a double-blind placebo controlled clinical study that compared the results of hair growth across 42 patients; 24 active light Therapy users and 18 receiving placebo.The paper concludes with the data; “Subjects receiving LLLT at 655 nm achieved a 37% increase in hair counts as compared to sham treated control patients in this multicenter RCT. These results are similar to those reported in an earlier study using the same device in males with alopecia.” This impressive finding also comes with unbeatable safety of Light Therapy, quote “No adverse events or side effects were reported.” The increase in hair count and the increase in hair growth rate are the consistent & reproducible findings across clinical trials, for both men and women, and across all skin tones. As an interesting note, this study used a red incandescent bulb for the sham (placebo) control. While the incandescent bulb was stated to “glowed red but did not deliver measurable light to the subject's scalp” by the very observation of a red glow means that some amount of visible light energy was being received by the skin, which could also contribute to the results that the placebo group experienced growth, when no-growth would be the expectation.

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Next, we will turn to our featured Clinical Review of the week that covers the impact of Light Therapy across several forms of use, including our focus of Hair Growth. Beyond providing the scientific history of how Light Therapy was first discovered to grow hair, the clinical review lays out how the FDA has approved & acknowedged this emerging intervention. The paper reads, “In the 2007, FDA approved the first LLLT device (laser, 635 nm) for the treatment of hair loss, in particular for androgenetic alopecia.” The paper goes on to visualize what is happening in the hair follicle itself in the case of androgenetic alopecia. We see a representative hair follicle that has dwindled become a strong healthy hair follicle once again, after a proper dosing of Red Light Therapy.

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With these studies in context, we can state confidently that Light Therapy is a safe & effective way to stimulate hair growth across the full spectrum of human body types. This incredible finding is wonderful news for anyone who is looking to improve their hair thickness, prevent hair loss, or regrow lost hair. The beauty of this method is that it does not just apply to the head - Light Therapy boosts the activity of any hair follicle. If you are seeking thicker eyelashes and eyebrows, the same exact science applies. Men may find Light Therapy as their partner if they are seeking to grow a thick, full beard. Whatever the reason, Light Therapy for Hair Growth is tried & true science, an FDA Approved method that is sure to revolutionize the beauty industry.

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