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Full Body Red Light Therapy: What You Need to Know

Alyson and Dr. Genevieve Newton introduce the newest Fringe product — a full-body red light mat that rolls up like a yoga mat, offers a cordless/wireless option, and comes with a TPU protective cover. But this episode isn't just a product launch. It's a comprehensive look at the science behind full-body photobiomodulation, including some of the most common misconceptions in the red light therapy space.

Dr. Gen addresses the intensity myth head-on: devices claiming 100 mW/cm² have been measured by third parties at 38–50 mW/cm². The Fringe approach targets evidence-based intensity levels modeled on what the sun produces, not on marketing numbers. The 1:2 red-to-NIR ratio used in most Fringe products is explained through physics — how red light works more superficially and near-infrared penetrates deeper tissue. The dosing science is equally important: because cellular effects last 12–48 hours after a session, the goal is three to five sessions per week, not daily overexposure.

Research highlights include fibromyalgia, cardiovascular health, sleep quality, and the autonomic nervous system's parasympathetic shift during sessions. The episode also covers who should be cautious (photosensitivity, active cancer sites, pregnancy), why pets are safe at reduced intensity and shorter duration, and what it actually feels like to use a full-body mat as a daily wellness practice.

 

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Transcript

Alyson: Hi everybody, welcome to the Fringe. My name is Alyson, owner and co-founder at Fringe. Today we have Dr. Genevieve Newton, our Scientific Director at Fringe, and we're going to be talking about a topic that Jen and I have been working on for about a year: full body red light therapy. There are so many red light therapy products now — toothbrushes, shower heads, face masks, body wraps — and you can also go to recovery facilities and get into what looks like tanning beds or saunas with red light therapy. We got very interested in the additional health benefits of utilizing red light therapy for your whole body, researched it, and started working on a product we felt would be really helpful for our community. To start — Jen, a brief explanation of what red light therapy actually is and how it works in our bodies.

Genevieve: Red light therapy is the term we use to describe the use of either red, near-infrared, or the combination of both for the purposes of influencing biology. When we talk about light, we're describing a photon traveling through space along a wave function. We measure wavelength in nanometers — 10 to the minus 9 meters — so very, very tiny. The shortest wavelengths are ultraviolet light — high energy, important for vitamin D synthesis in the skin, but can also cause UV damage. Then as we go into the visible spectrum from violet to red, those wavelengths get longer. At the end of the visible spectrum, we have red light, which is about 620 to 750 nanometers. Then we shift into the infrared group, going from about 750 all the way to about 1400 nanometers. We can break that up into near infrared and far infrared. With red light therapy, we're using that near infrared range — usually 810 to 850 nanometers. For more specialized products like for the brain, we tend to use even longer wavelengths around 1000 to 1100 nanometers. So that's what we mean when we say red light therapy: using red and near-infrared light for the purposes of influencing biology. There are really two ways that light affects our biology. The first is light through our eyes, which activates pathways in the brain related to circadian rhythm regulation, mood, and hormones. The second — which is how most products are used today — is light to tissue. That can be skin or tissue inside the body. As the light gets to our tissues, they're filled with organelles called mitochondria. Every single cell in our body is filled with these energy-producing components that make ATP, which is our energy currency. ATP fuels everything: growth, repair, maintenance, all cellular functions. We have essentially an epidemic of mitochondrial dysfunction right now because of our lifestyle, exposure to toxins, poor dietary choices, lack of activity. This is really the reason why red light therapy is proving to be beneficial for so many people for so many different things — our mitochondria need support, and this is a really easy way of doing it.

Alyson: Light is basically a nutrient for our body. Coupled with sedentary lifestyles, poor diets, lots of toxins in our environment, we also simply do not energize ourselves via the sun enough. Jen and I focused a lot in the early days on what really is red light therapy — and our focus has been to try to emulate or make those wavelengths of red and near infrared light as close as possible to what we actually receive from the sun. And we put two times the amount of near infrared light in almost every product we make. Can you speak to why we're doubling up on near infrared?

Genevieve: As a starting point, philosophically, our approach to product development has really always been to mimic nature as much as possible. We're spending 93% of our time indoors now. So when you have a product that's designed to mimic nature, it's more of a situation of almost replacing what's been lost. When we look at the distribution of wavelengths in the sun, just under 50% of those wavelengths are made up of red and especially near-infrared. If we were to sample the sun and say what's the most important part of this spectrum, you would look at what's present in the greatest amounts — and that's your red and near-infrared, especially near-infrared. Near-infrared in particular has been found in recent years to be really remarkable. It doesn't vary throughout the day in the same way that other wavelengths do — there's much more consistency, and even when you're in the shade, you have an enormous exposure to near-infrared light. Those green leaves everywhere on the trees are reflecting that light towards our bodies. There's been absolutely fascinating research just in the last year showing that long wavelength near-infrared light passes right through our bodies. It's even passing through our clothing — also recently discovered. Where red light and near-infrared differ is in depth of penetration: red light goes in about two to five millimeters. Near-infrared — recent research is showing it has the ability to penetrate right through the body. If we're going to use both wavelengths and want to induce effects that are deep within the body as well as superficial, you need to combine the two. That's why we use a ratio of one red light chip to two near-infrared light chips — very deliberately and intentionally.

Alyson: Red and near-infrared light in laser format has been used clinically for decades and has been studied for 50 years. It's just new in its popularity. One of these small lights actually has three chips generating light via LED technology — two of those chips are near infrared, which you don't actually see. The interesting thing is you can receive near-infrared light and there's no brightness to it — it's completely invisible. But the light absorbs into our body and energizes the cells. It doesn't matter if the cells are in our hair follicles, skin, fat, muscle, ligaments, tendons, or organs. Once the light is absorbed, the effect really is systemic. Which is why we moved from saying: I've got a shoulder that hurts, put this on my shoulder. To asking: is there an opportunity and should we entertain that a full-body light therapy session has much more systemic benefit for our body?

Genevieve: Systemic really just means going throughout the entire system. When you think about what we've done with our approach to health over the last hundred years, we've started breaking the body up into all these little parts — different medical specialists, not thinking about the interconnectedness of all the systems. The cardiovascular system, the lymphatic system, the nervous system — it goes from top to toe, outside to inside, it's everywhere. If we want to influence those systems to a greater extent, you're going to have a greater effect if you're delivering light to the entire body at the same time. The most well-researched area for full-body light therapy is fibromyalgia, because fibromyalgia is a full-body pain condition. If you want to address pain in somebody with fibromyalgia, you can use a localized approach, but that's going to be really time-consuming one area at a time. There have also been a couple of really interesting cardiovascular studies — people with hypertension doing full-body exposure — and studies for athletes on performance and recovery. The lack of research in this area has more to do with research limitations than lack of benefit. A study would require every subject coming in three to five times a week for 20-minute sessions — very labor intensive and expensive. Now that we're moving into technology allowing easy at-home use, it's going to open up a lot more evidence. I've been using our sample mat for about a month and what I find most remarkable is the nervous system effect. I had read about a research study looking at autonomic nervous system effects in fibromyalgia patients showing a shift towards a parasympathetic response, and I remember texting Alyson the first time I used it and saying: I feel so relaxed, it's unbelievable. That's something we don't really get with localized therapy — that ability to have the entire nervous system shift towards a parasympathetic state, which is really great before bed. There's also a study in athletes showing that full-body red light therapy improved their sleep quality.

Alyson: The product itself: it's a mat that lays on the ground. It rolls up like a yoga mat, it has double near-infrared light, there's an optional TPU protective cover so if your pets want to lay on it you don't have their fur on it or you can sterilize it. You can plug it into the wall or charge the battery pack for portability. You do 15 minutes face down and then 15 minutes on your back, or whatever works for you. Sessions go up to 30 minutes. And it's very relaxing — I hope people slow down and use this. I hope people do a 15-minute session and just lay there and breathe and relax, maybe listen to some music, maybe do a little movement on the mat. Something that's restorative.

Alyson: How often should people use it? How long? Should they use it every day?

Genevieve: We as humans have this inborn tendency to think more is better. But we've had thousands of research studies unpacking how red light therapy works. We know how it works on a cellular level and it's been very carefully mapped out. We know there is a cellular response that lasts between 12 to 48 hours. It's not a spike and drop — it's a gradual rise, a peak, and then a return to baseline after about 48 hours. We also know that the effects are cumulative. Light therapy actually gives you a dose of light in the same sort of way that taking a supplement gives you a dose — we can calculate the dose in joules per centimeter squared, which is a function of intensity and treatment duration. If the dose is too small, nothing happens. As the dose increases, there's this really significant range at which there are benefits. But you can also reach a point where the benefits start to disappear — this is called photo inhibition. Thankfully the beneficial middle range is really quite large. So with many different devices you can fall into this range. Most people will experience benefits from using devices with a range of intensity from around 10 to 50 milliwatts per centimeter squared. Circling back to how often: it's safe to do it daily, but you don't need to do it daily. The cellular effects last up to 12 to 48 hours, so typically we recommend three to five times a week — consistent with what we know about cellular biology and consistent with the scientific literature. Very few studies use a daily frequency, and when a study finds benefit at less than daily, that means we don't need to do it daily. Once a day on a single body part is fine. For a full-body mat, once a day, perfectly safe. But if your lifestyle doesn't allow for daily use, you'll still probably get as good a benefit as you would with daily use.

Alyson: We literally get these questions every day. We tell everyone three to five times a week. The answer of whether you should use it every day should be based on whether you're experiencing additional benefit. Use it three to five times a week, then try a week of every day and see if your shoulder feels better or you notice a positive difference. There's very little that's black and white about light therapy. One really cool thing that happens when light is absorbed: the body generates energy or ATP, but also releases nitric oxide — which acts like opening a blood vessel, increasing blood flow to a region. That's measured and is an incredibly beneficial response. Light is supportive to what the body naturally does. You don't have to worry so much about messing something up by putting it over an area — it's a natural nutrient, and when we make it like our bodies were designed to receive it, our bodies are very intelligent in using it.

Genevieve: Let's mention a couple of situations in which it would not be beneficial. One scenario is if you're using a very high intensity product for an extended period of time — if you stood in front of a really high intensity panel for 10 to 20 minutes, you could have some superficial skin damage, an increase in oxidative stress, and generally feel quite unwell. So that's not advisable. For contraindications: pregnancy — we can't do research with pregnant people, so we use that as a contraindication. If you're pregnant, use the light on different body parts. You can use the mat lying on your back — you just wouldn't lie on your stomach over the abdomen anyway. We also have to be cautious with use over active cancer sites. Light therapy should be avoided over active cancer sites but can be used supportively on different body parts. There's cool research showing light therapy benefits things like chemotherapy-induced neuropathy and lymphedema. For people who have a history of skin cancer, the general consensus recently published in the literature is that it is safe as long as that's a recovered cancer, not an active one. Many people take photosensitizing medications, which makes them more sensitive to light — not a contraindication, but you may be more sensitive to the heat generated by near-infrared. The approach is to reduce treatment time and start really slowly: low and slow. And if you do have many medical problems or are taking a lot of medications, consult with your healthcare provider before starting any new therapy, even something as gentle as red light therapy.

Alyson: We generally tell people: if you can be out in the sun for 20 minutes, you can do red light therapy. But when it comes to a specific condition, ask your doctor, talk to them about it. People want a trusted source of information — that's what we're trying to be. And we have six people on our medical team now with various backgrounds. Some of the most fun questions are the ones we don't know the answers to yet. As for eyes: should they be open or closed during a full-body mat session?

Genevieve: The most commonly researched outcome for light therapy is actually using it to benefit vision. That said, the tissues of the eye are very, very sensitive. If you stand in front of a high intensity light panel with your eyes open, you're probably going to do retinal damage. With our lower intensity products, it's really a matter of comfort — we certainly don't advise staring directly into the light. If you have photosensitive eyes, you may want to use a goggle. But for most people, just closing your eyes is absolutely sufficient when lying on the mat. Eyes closed, relax, and you're totally safe. If the light bothers you, just cover your eyes.

Genevieve: Two social media trending topics I'd like to address. The first is "magic bullet wavelengths." When we look at the body of literature — thousands of studies — in the red range and near-infrared range, as long as you're avoiding the 700 to 800 nanometer range where you don't get much cellular response, you get very good cellular response in the 600s and in the 800s. There's no magic wavelength because the sun doesn't generate just one single red wavelength and one single near-infrared, and it wouldn't make sense for biology to work that way. Also: LED lights generate a range of wavelengths, not a single wavelength. When we say our mat is 660 nanometers, that's not quite accurate — it generates from about 640 to 680, maybe a little more on either end. The peak is 660. Companies advertise a specific wavelength as a magic bullet for skin health or brain health or joint health — that's inconsistent with biology, inconsistent with LED technology, and inconsistent with how the sun works. The second topic is pulsed light. The claim that you need to flash the light on and off to get benefit is not consistent with our biology or with the scientific literature. When we compare pulsed delivery to continuous delivery, you absolutely can have benefit from pulsing — it's still light therapy — but you don't need it. The one place where pulsing has some differential effects is in the brain, and that's because of brainwave entrainment — a different story than what's being promoted on social media.

Alyson: And one more: many people contact us saying they read they need a product that's over 100 milliwatts per centimeter squared.

Genevieve: When these devices are measured by independent third parties using appropriate measuring devices, almost never are they actually 100 milliwatt per centimeter squared or higher. Products on the market claiming to be at 100 mW/cm² have been measured at closer to 50. I've seen some measuring in at 38 and 40. The experts in this field generally say: if they were really that high, we'd be seeing harm and not benefit. This is great for these companies because they're actually thankfully producing products that are beneficial. But unfortunately we have this problem in the industry where values are being shared that are not accurate and are misleading — making people think these high numbers are targets they should be trying to achieve, when really the upper limit that experts suggest not exceeding is 50 milliwatts per centimeter squared. That's half of what these products are claiming to be at. At Fringe, we try to make every product within the range the sun measures for red and near-infrared — roughly 20 to 40 mW/cm² — which is evidence-based and very safe. We feel really comfortable telling people they could use it every day if they wanted to, but three to five times a week is ideal.

Alyson: Okay, well, that was three great myth busters to end our podcast today. We are part of the medical team at Fringe — my name's Alyson, and this is Jen, our Scientific Director. We're super excited to have a full body red light therapy mat coming to market. If you've been someone who loves using red light therapy and just wants to get it all in one place, you are going to absolutely love this. And as a shout out to all my furry friends: please, if you have animals in your house, order the cover to go on top of your mat, lay it on the ground, and let your dogs and cats come lay on the mat and receive a session as well. Super safe for them — they're very similar in how their bodies work. They just teach us because we don't tell them what to do. They just go do it. Thank you, everyone. Talk to you soon.

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Last updated: June 24, 2026
Fringe

about the author

Alyson Evans, DC

Has dedicated the last 20 years to mashing up her passions for healthcare and education, alongside pursuing her purpose of building and serving a team. Alyson has helped grow multiple businesses, by prioritizing professional education and product innovation. Up for a new challenge, she found herself asking "What else is possible?" Alyson is the C-CEO and Founder of Fringe, a company grounded by its dedication to improving how we live and how we learn.

The contents in this blog; such as text, content, graphics are intended for educational purposes only. The Content is not intended to substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your healthcare provider.