Red light therapy has moved from pro sports locker rooms into living rooms. One of the most striking pieces of evidence comes from a randomized clinical trial that added red light to a diet — and beat the diet on its own across almost every marker it measured.
The clinical trial at a glance
The study — Nagy EN et al., Journal of Lasers in Medical Sciences, 2021 — recruited 60 older adults (aged 65–75) with non-alcoholic fatty liver disease (NAFLD), a condition estimated to affect roughly a quarter of adults worldwide. Participants were randomly split into two groups:
- Diet only: a Mediterranean diet for 12 weeks.
- Red light + diet: the same Mediterranean diet plus low-level laser (red light) therapy.
The light was delivered at a 660 nm wavelength using abdominal straps (four LED clusters of 72 LEDs each) placed around the waist, for 30 minutes, twice a week, over 12 weeks.
What the researchers found
Both groups improved — a Mediterranean diet alone is genuinely good for metabolic health. But the group that added red light improved significantly more. The authors reported that both groups showed a significant reduction in liver enzymes, blood lipid profile, BMI and waist circumference (P<0.001 and P<0.01), and that the red-light group showed significantly greater improvements than diet alone (P<0.01).
In plain terms, across the board — liver enzymes, cholesterol and triglycerides, body-mass index and waistline — adding 660 nm light on top of the diet moved the needle further than the diet by itself. The researchers concluded that combining red light with a Mediterranean diet "may be considered as a treatment approach" to help improve liver function, control dyslipidemia and support weight loss in older adults.
Why would light affect fat and metabolism?
The leading explanation is photobiomodulation. Red and near-infrared light in the ~630–850 nm range is absorbed by cytochrome c oxidase, an enzyme in your cells' mitochondria. That absorption is thought to boost mitochondrial energy (ATP) production and cell signaling. When cells have more energy to work with, processes like tissue repair and metabolic activity can run more efficiently. It's the same fundamental mechanism behind red light's more established uses — which brings us to what most people actually use it for at home.
Beyond fat: recovery and skin
The 660 nm wavelength is best known and most widely used for two things:
- Muscle recovery: athletes use red light around training to help ease soreness and support recovery.
- Skin: red light is a staple of at-home skincare routines aimed at supporting skin quality and a healthy glow.
These are exactly the everyday use cases our panel is built for — while the metabolic research above shows just how much scientists are still discovering about this simple technology.
How this connects to the Gudslip® Red Light Therapy Panel
Our Red & Infrared Light Therapy Panel uses the same 660 nm wavelength studied above, in a compact, phone-sized design you can use at home, at the office or while travelling — without the bulk or the 300€+ price tag of studio panels. It's designed for the Gudsport crowd chasing faster recovery and anyone building a Gudbeauty skincare routine. Prefer a ready-made kit? The Pack Red Light Recovery bundles it for recovery-focused routines.
An honest note: the trial above used a specific clinical protocol (abdominal straps, 30 minutes twice a week for 12 weeks) aimed at a medical condition. Our panel is a wellness device for recovery and skin, not a treatment for fatty liver or any disease. It shares the wavelength that researchers are studying — it doesn't replicate a medical trial, and results vary from person to person.
How to use red light at home
- Position the panel close to clean, exposed skin over the area you want to target.
- Keep sessions short and regular — a few minutes, consistently, beats occasional long sessions.
- Avoid looking directly at the light and keep it away from your eyes.
- Make it part of your routine and give it time; changes are gradual, not instant.
Frequently asked questions
What wavelength did the fatty-liver study use?
660 nm red light, delivered via abdominal straps for 30 minutes, twice per week, over 12 weeks, alongside a Mediterranean diet.
Does red light "melt" fat?
No. In the trial, red light was added on top of a Mediterranean diet and the combination outperformed diet alone across metabolic markers. Light is a potential support to healthy habits — not a replacement for diet and exercise.
Is red light therapy safe?
660 nm red light is non-thermal and generally well tolerated. Avoid shining it directly into your eyes. If you have a medical condition such as NAFLD, or are pregnant, talk to your doctor before starting.
Who is the panel for?
Anyone who wants to support muscle recovery after training or add red light to a skincare routine at home.
The bottom line
A 2021 randomized trial showed that adding 660 nm red light to a Mediterranean diet improved liver enzymes, lipids, BMI and waist circumference more than the diet alone — a compelling sign of how far photobiomodulation research is reaching. For everyday routines, that same wavelength is a simple, portable tool for recovery and skin.
This article is for general information only and is not medical advice. Consult a healthcare professional about any medical condition, including fatty liver disease.
References
Nagy EN, Ibrahim FM, Jouda AA, Elsayed MM. The Effect of Laser Therapy Along With Mediterranean Diet Versus Mediterranean Diet Only on Older Adults With Non-alcoholic Fatty Liver Disease: A Randomized Clinical Trial. J Lasers Med Sci. 2021;12:e39. doi:10.34172/jlms.2021.39. PubMed