Red light therapy (also called low-level laser therapy or LLLT) is a non-invasive treatment that uses safe, clinically studied wavelengths of light (typically between 600–950 nm) to stimulate your hair follicles. When the light penetrates your scalp, it helps boost cellular activity, improve circulation, and encourage healthier regrowth over time.

When you use a red light device, the light penetrates through the scalp and is absorbed by your follicle cells. This light energy kickstarts your cells’ mitochondria, which produce more ATP (the energy your cells use to function). With more energy available, your follicles can repair, strengthen, and shift back into an active growth phase. Improved circulation also ensures that oxygen and nutrients are delivered where they’re needed most.

Yes, clinical research has shown meaningful results for both men and women. For example, a 16-week randomized, double-blind trial found that participants using a helmet-type device with 655 nm red light experienced an average increase of ~41.9 hairs per cm², compared to the control group*.

For you, this means that with consistent use, red light therapy can help increase hair density and thickness in areas affected by thinning or pattern loss.

*Yoon, J. S., Ku, W. Y., Lee, J. H., & Ahn, H. C. (2020). Low-level light therapy using a helmet-type device for the treatment of androgenetic alopecia: A 16-week, multicenter, randomized, double-blind, sham device-controlled trial. Medicine, 99(29), e21181.

For best results, aim to use your device 2–3 times per week. Each session only takes a few minutes, but consistency is key. Think of it as part of your regular self-care routine, just like cleansing your skin or taking your vitamins.

Red light therapy is generally very safe and well tolerated. Most people experience no side effects at all. Occasionally, you may notice mild scalp warmth or temporary redness, but this usually passes quickly. 

If you have a medical condition or are sensitive to light, it’s always best to speak with your healthcare provider before starting.

Absolutely. Many people pair red light therapy with topical products like our Reboot Biotin Serum or Rosemary Hair Growth Oil, and some even use it alongside physician-prescribed treatments such as minoxidil or PRP therapy. Combining approaches can help maximise your results, but if you’re considering prescription treatments, check in with your doctor first.

Results don’t happen overnight, but consistency pays off. You may notice less shedding in 8 weeks, thicker and stronger strands around 12 weeks, and visible new growth from 16 weeks onwards. Everyone’s journey is different, but the key is to stay consistent with your routine.

Yes, it works for both men and women. Whether your thinning is genetic, hormonal, postpartum, or stress-related, red light therapy supports healthier follicle activity and can help you regain confidence in your hair.

When choosing a device, pay attention to the wavelength (650–670 nm is optimal for stimulating follicles), the number of diodes (more diodes cover more scalp), and ease of use. 

Comfort is crucial, especially if you’ll be using it a few times a week. Always make sure the device is FDA-cleared or compliant with your region’s health standards.

You can explore our full range of FDA-cleared, clinically backed devices right here on Dr. Pen. From portable caps to professional-grade helmets, we’ve designed solutions that fit seamlessly into your lifestyle and target every stage of thinning.