PEMF therapy and red light therapy are both drug-free treatments that don't break the skin, used for pain relief, recovery, and healing. Both therapies work by changing how your cells behave, but they use very different kinds of energy to do it. Red light therapy, also called photobiomodulation (PBM), uses red and near-infrared light, which is absorbed by the mitochondria, the parts of your cells that make energy. PEMF (pulsed electromagnetic field) therapy uses pulsing magnetic fields, which act on the outer wall of your cells, called the cell membrane.
That one difference shapes what each therapy has been studied for, how strong the research is, how you use it at home, and who needs to be careful. So the real question isn't which therapy is better. It's which one fits your goal.
Key takeaways:
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They use different energy in different ways. Red and near-infrared light are absorbed by an enzyme in the mitochondria called cytochrome c oxidase. This helps cells make more ATP, the molecule they use for energy. PEMF's magnetic pulses seem to work at the cell membrane, where they affect the receptors and channels that send signals into the cell.
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Both are used for pain, but the research isn't equal. A review of 22 placebo-controlled studies found that low-level laser therapy (a form of red light therapy) reduced knee arthritis pain when the right dose was used. Reviews of PEMF for knee arthritis disagree on whether it reduces pain, though several find it helps people move and function better.
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Red light therapy has much more research on muscle recovery. A review of 46 studies looked at how PBM affects exercise performance and recovery, including muscle soreness. PEMF research here is limited to a few small studies with mixed results.
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PEMF has a proven medical role in bone healing. The FDA has approved PEMF bone growth stimulators for fractures that don't heal. These are prescription devices, not the same as PEMF mats sold to consumers.
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Only red light therapy is a skin treatment. RLT has been studied for collagen production, wrinkles, and skin rejuvenation. PEMF doesn't have similar skin research.
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Safety concerns are different. PEMF devices usually carry warnings for people with pacemakers or other implanted electronic devices. Red light therapy warnings focus on protecting your eyes and talking to your healthcare provider if taking medicines that make skin sensitive to light.
If your main goals are easing muscle and joint pain, recovering from workouts, or improving your skin, red light therapy is likely the more practical choice. Novaalab's red light therapy devices are designed to deliver red and near-infrared light right to the area you want to treat. Keep reading to learn how each therapy works, what the research shows, and how to choose the right one for you.
PEMF and Red Light Therapy Use Different Types of Energy
Red light therapy sends light into your body. PEMF sends magnetic pulses into your body. Neither one uses heat, needles, or medicine, and both aim to help cells work better. But light and magnetic fields interact with cells in different ways. Light is absorbed by specific molecules inside the cell. Magnetic pulses pass through the body and create tiny electrical currents in the tissue. This table shows how the two compare.
| Red Light Therapy (RLT) | PEMF Therapy | |
|---|---|---|
| Type of energy | Red light (about 630–660 nm) and near-infrared light (about 810–850 nm) | Pulsing magnetic fields |
| What it acts on | Mitochondria, the energy-making parts of cells | Cell membranes, the outer walls of cells |
| What happens next | Cells make more ATP (energy), release nitric oxide, and send short repair signals. | Changes in calcium and other signals that tell the cell what to do |
| How deep it goes | Red light reaches superficial tissue while near-infrared light can reach deeper tissue, depending on the device. | Magnetic fields penetrate soft tissue and bone; treatment depth depends on the device and coil design. |
| Best-studied uses | Muscle and joint pain, muscle recovery, tendons, skin | Bone fractures that won't heal; some arthritis research |
| Home devices | Pads, wraps, wearables, panels, handheld devices | Mats, pads, rings, small portable units |
| What it feels like | Usually nothing, or mild warmth | Usually nothing; some devices cause a light tapping or twitching feeling |
| Main safety concerns | Eye protection; medicines that make skin sensitive to light | Pacemakers and other implanted electronics; pregnancy |
Interestingly, both therapies may lead to some of the same results, such as nitric oxide signaling, more cellular activity, and less inflammation. They just start in different places: red light inside the cell's mitochondria and PEMF at the cell's outer wall.
How Does Red Light Therapy Work?
Red light therapy works through photobiomodulation, which means light is changing how cells function. When certain wavelengths of red and near-infrared light reach a cell, an enzyme in the mitochondria called cytochrome c oxidase absorbs them. This enzyme plays a key role in energy production.
A 2018 research review explains the leading theory. In stressed or damaged cells, a molecule called nitric oxide can attach to cytochrome c oxidase and slow down energy production. Red and near-infrared light knock the nitric oxide loose. That leads to three effects:
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Cells make more energy. With the enzyme working freely again, the mitochondria can make more ATP, the molecule cells use as fuel.
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Nitric oxide is released. Once it's free, nitric oxide can help relax blood vessels. This may be one reason studies in people have found that near-infrared light can increase blood flow in the treated area.
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Cells get a short signal to repair. Light creates a brief, small burst of reactive oxygen species. In this small amount, they act as a signal, not as damage, and switch on processes involved in cellular repair and inflammation control. The same review notes that in cells that are already stressed, PBM tends to lower oxidative stress, a type of cell damage.
These changes in cells explain why researchers have studied photobiomodulation to reduce inflammation, relieve pain, help tissue repair, and support cellular health in general. Wavelength matters too. Red light is mostly absorbed in the skin and tissue just below it. Near-infrared light travels deeper, into muscles and joints. Because different red light therapy wavelengths can have different benefits, many red light therapy devices use both red and near-infrared wavelengths of light.
Remember: You may see some red light therapy research described as low-level laser therapy (LLLT), which traditionally uses low-intensity lasers to deliver red or near-infrared light. While today's at-home red light therapy devices commonly use LEDs, both can deliver wavelengths of light that interact with cells and trigger the biological processes associated with photobiomodulation. That means LLLT research can help us understand the mechanisms behind red light therapy, including its effects on mitochondrial activity, cellular signaling, and ATP production. However, the light source matters less to the underlying PBM mechanism than whether an appropriate wavelength and dose actually reach the target tissue.
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How Does PEMF Therapy Work?
A PEMF device uses a coil of wire to create electromagnetic pulses. These are magnetic fields that switch on and off very quickly. They pass through clothing, skin, and bone. As they pass through, they create small electrical currents in the tissue. Unlike light, magnetic fields aren't absorbed by one specific molecule. So researchers have focused on how PEMF affects the electrical activity of cells.
The best-supported theories focus on cell membranes:
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Receptors on the cell's surface: A review of PEMF and bone found that PEMF acts on adenosine receptors, which are sensors on the cell membrane. Signals through these receptors seem to help cells build bone and cartilage and to calm inflammation in joints.
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Calcium channels: Other research suggests PEMF affects the cell's electrical charge and its calcium channels, the openings that let calcium in and out. Calcium acts as a messenger inside cells, and these changes can lead to other effects, including the release of nitric oxide.
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Inflammation signals: Lab and animal studies suggest PEMF can change the release of chemical messengers that turn inflammation up or down during healing.
Scientists understand how PEMF works less clearly than they understand red light therapy. PEMF devices also vary a lot in strength and pulse pattern. A result from one device's settings may not apply to another, which makes it hard to know whether a study applies to the device you might buy.
Both Therapies Are Used for Pain Relief
Both therapies are reasonable options for long-term joint and muscle pain. But if pain relief is your main goal, red light therapy has more consistent research behind it, especially for knee arthritis. Its benefits also depend on getting the right dose of light, so using it regularly matters. Neither therapy replaces exercise, physical therapy, or medical care.
Pain management is where these two therapies overlap the most. Both are sold for chronic pain, joint pain, arthritis, and back pain, and both have been tested in clinical trials. The clearest way to compare them is knee osteoarthritis, the type of arthritis where the cartilage cushioning the joint wears down. It's the condition both therapies have been studied for most.
Red Light Therapy for Pain
Red light therapy seems to ease different types of pain, such as knee pain, arthritis, and back pain, in several ways at once. It calms inflammation, gives stressed cells more energy, and improves blood flow in the area.
The strongest single source for red light therapy for pain is a 2019 review in BMJ Open. Researchers combined 22 studies involving 1,063 people with knee osteoarthritis. In each study, some people got real low-level laser therapy and others got a fake (placebo) treatment. Overall, the real treatment reduced pain more than the placebo. The benefit showed up at the end of treatment and lasted as long as 12 weeks afterward.
Two details stand out. First, pain relief was greater when studies used the doses recommended by the World Association for Laser Therapy. Second, with those doses, pain relief was actually strongest two to four weeks after treatment ended. That suggests the benefits build over time instead of fading as soon as a session is over. People's ability to use their knees also improved, and no side effects were reported.
Red light therapy has helped other kinds of pain in studies, too. A trial published in The Lancet, for example, found that low-level laser therapy reduced long-term neck pain compared with a placebo.
While most research involved LLLT and not red light therapy, their underlying PBM mechanisms overlap when they're delivering comparable wavelengths and doses.
PEMF Therapy for Pain
The research on PEMF for joint pain is more mixed. One likely reason for these mixed results is that PEMF devices are so different from each other. Studies have used many different strengths, pulse speeds, and treatment schedules. That makes it hard to know which settings, if any, reliably reduce pain.
The most recent research is mixed:
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A 2020 review in Physical Therapy combined 15 placebo-controlled studies of people with osteoarthritis and found that PEMF improved pain, stiffness, and physical function.
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But a 2019 review that looked only at knee osteoarthritis found something different. PEMF helped people move and function better, but it didn't reduce pain or stiffness more than a placebo.
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A 2026 review of studies from the past 10 years also found no clear improvement in knee pain after one month.
Red Light Therapy Has More Research Behind Muscle Recovery
If your priorities are recovering faster, feeling less sore, and training more consistently, red light therapy is the option with more research behind it. It's also easy to fit around a workout. Depending on your goals and your device's instructions, you can use red light therapy before or after a workout or both.
The way red light works fits recovery well. Better blood flow and the release of nitric oxide may help deliver oxygen and nutrients to tired muscles. Lower inflammation and oxidative stress may help limit the muscle damage that leads to soreness.
Muscles use a lot of energy, which makes them a natural fit for a therapy that works through the mitochondria. As a review in the Journal of Biophotonics explains, muscles rely on ATP to contract and to recover. The main theory for how PBM helps muscles is that it helps them make more ATP.
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That review looked at 46 studies with 1,045 people, ranging from people who didn't exercise regularly to elite athletes.
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Researchers used red and near-infrared light either before exercise or after it. Then they measured things like fatigue, how many repetitions people could do, muscle strength, signs of muscle damage in the blood, and delayed onset muscle soreness (DOMS), the soreness that peaks a day or two after a hard workout.
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The authors concluded that PBM can improve performance and recovery. Muscle samples also showed less inflammation and oxidative stress. The results were strong enough that the authors raised the question of whether PBM should be regulated in sports competitions.
Results depend on the wavelength, dose, timing, and muscle treated. Still, taken together, the research gives red light therapy a much stronger case for exercise recovery than PEMF.
Only a few small studies have tested PEMF for muscle recovery. In one placebo-controlled trial of 30 college students, daily 15-minute PEMF sessions reduced muscle soreness and improved some measures of muscle function after a hard arm workout. But other small studies found no effect on soreness or muscle damage. Without larger studies, it's hard to say whether PEMF reliably helps recovery or which settings would work best.
Both May Support Tissue Repair but in Different Ways
If you want to support healing in soft tissue, like tendons, muscles, or connective tissue, red light therapy has more research and is easier to use at home on a specific area. If you have a broken bone that isn't healing, PEMF bone stimulation is a real medical option to ask your orthopedic doctor about.
Red Light Therapy Supports Cellular and Tissue Repair
The same effects that help red light therapy with pain and recovery can also help damaged tissue repair itself. These include more cellular energy, better blood flow, and controlled inflammation.
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A review of how photobiomodulation works describes PBM being used to help regenerate damaged tissue, including wounds, bones, and tendons. It also notes that PBM has a strong effect on stem cells, which the body uses to build new tissue.
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Tendons, the tough cords that connect muscles to bones, are one of the better-studied examples. A review of tendon injury studies found that low-level laser therapy can work when the recommended dose is used. In those studies, people with tennis elbow gained grip strength, and people with Achilles tendon problems had less pain. The overall evidence was mixed, though. Once again, the right dose made the difference. Our guides to shoulder pain and plantar fasciitis cover tendon and connective-tissue research in more detail.
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Red and near-infrared light have also been studied for wound healing. Research shows that PBM can activate fibroblasts, the cells that make collagen, and help new tissue form.
PEMF Has an Established Role in Bone Healing
This is PEMF's clearest advantage. The FDA has approved PEMF as a safe and effective treatment for nonunions, broken bones that fail to heal on their own. Orthopedic doctors have used PEMF bone growth stimulators for decades. Patients usually wear the device over the fracture for hours each day, under a doctor's direction.
This fits what scientists know about PEMF and bone cells. Signals through adenosine receptors on the cell membrane seem to help bone cells build new bone. In April 2026, the FDA reclassified these bone growth stimulators from Class III (its highest-risk category) to Class II. The change means the agency considers less stringent regulatory requirements sufficient to ensure the devices are safe and effective.
The research still has limits. A Cochrane review, a type of review known for its strict standards, found that electromagnetic stimulation may help fractures that are slow to heal or not healing. But it called the evidence inconclusive. The type of device matters, too. A prescription bone growth stimulator uses a specific, tested signal for a specific medical purpose. A general wellness PEMF mat hasn't necessarily been shown to support bone health or bone healing.
Red Light Therapy Offers Skin Benefits
There are many red light therapy benefits, and skin health is one of them. Red light therapy is also a skin treatment, but PEMF has very little skin research. So if better skin is one of your goals, even a secondary one, that alone may make red light therapy the better choice.
Red light, especially between 630 and 660 nm, is absorbed in the skin. There, it acts on fibroblasts, the cells responsible for collagen production and elastin. These proteins keep skin firm and stretchy. As you age and as your skin is exposed to the sun, your body makes less collagen. Skin gets thinner, and fine lines and wrinkles become easier to see.
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One of the best-designed skin studies is a controlled trial in Photomedicine and Laser Surgery with 136 volunteers. Participants were treated twice a week for 30 sessions with red light alone or red plus near-infrared light. Compared with a group that got no treatment, treated participants had better skin tone, smoother skin, and more collagen, measured with ultrasound. Because these results were measured with tools, not just based on how people felt about their skin, the study gives solid support for red light therapy's anti-aging and skin rejuvenation benefits.
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PBM has also been studied for acne and other skin conditions, such as eczema and psoriasis. A review of light therapy for skin explains that red light calms inflammation, while blue light kills acne-causing bacteria, so the two may work well together. The review also covers research on wound healing and scars. If acne is your main concern, our comparison of red light vs. blue light therapy explains how the two colors of light work differently.
PEMF doesn't have similar research for wrinkles, collagen, or acne.
Both Therapies Can Be Used at Home
You can get both therapies at a clinic, but home devices make either one easy to use on your own. Both usually involve short sessions repeated over several weeks. The details that affect your results, though, are different.
How to Use Red Light Therapy
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Pick a device that fits the area you're treating. Near-infrared light needs to reach the tissue you want to help. A device that rests against or wraps around your knee, back, or foot delivers light more evenly than a panel you stand in front of.
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Keep the distance in mind. The farther the light source is from your body, the less light reaches your tissue, and the drop-off is fast. A device that touches your skin gives you the same dose every session.
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Stick to the recommended session length. Most home red light therapy sessions last about 10 to 20 minutes. Longer isn't better. With PBM, too much light can actually reduce the benefit.
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Be consistent. Studies generally used repeated sessions over several weeks. In the knee arthritis research, pain relief was greatest weeks after treatment ended. Three to five sessions a week is a practical goal for most people.
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Treat bare skin. Clothing, lotion, and makeup can block light.
How to Use PEMF Therapy
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Place the coil over or around the area or lie on the mat, if using one. Magnetic fields pass through clothing and even casts, so PEMF devices don't need to touch your skin. But the field gets weaker farther from the coil, so placement still matters.
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Follow the device's settings. PEMF devices range from low-strength mats to high-strength units, and there's no standard way to use them. Start with the manufacturer's recommended settings.
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Expect session length to vary. Home sessions are often 10 to 30 minutes. Medical bone growth stimulators may be worn for hours each day.
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Be consistent. Like red light therapy, PEMF is usually used over several weeks, not as a one-time fix.
This table gives you a snapshot to compare both types of devices.
| Red Light Therapy | PEMF Therapy | |
|---|---|---|
| Device types | Wraps, pads, boots, handheld lasers, panels, full-body pods | Mats, pads, loops, small portable units |
| Treating one specific area | Excellent with wraparound or contact devices | Good with small coils; whole-body mats are less targeted |
| Works through clothing | No | Yes |
| Hands-free | Yes, with pads and wearables | Yes, with mats and pads |
| Skin benefits | Yes | No |
| Settings to manage | Usually few, such as mode and time | Often several, such as strength, pulse speed, and program |
| Cost | Ranges with devices for one area usually costing less than full-body systems | Varies widely, from low-cost portable units to expensive high-strength systems |
Safety Depends on the Therapy and the User
Both therapies are generally safe when used as directed. The knee arthritis review of low-level laser therapy found no side effects across 22 studies. And unlike ultraviolet (UV) light, the red and near-infrared light used in PBM doesn't damage your DNA. PEMF studies have also reported few side effects. The difference is in who needs to be careful, and this table allows you to see which considerations should be made for each type of device.
| Consideration | Red Light Therapy | PEMF Therapy |
|---|---|---|
| Pacemakers, defibrillators, and other implanted electronics | Not usually a concern | Often listed as a reason not to use it or to use caution; ask your heart doctor or device specialist first |
| Pregnancy | Talk with your healthcare provider, and don't treat your belly. | Often listed as a precaution because effects on a developing baby haven't been studied |
| Eyes | Don't stare into bright LEDs; wear eye protection when treating near your face. | Not usually a concern |
| Medicines or conditions that make you sensitive to light | Talk with your healthcare provider first | Not usually a concern |
| Metal implants | Not usually a concern | Check the device's instructions; some list warnings. |
| Cancer or unusual skin spots | Don't treat the area without your doctor's approval. | Don't treat the area without your doctor's approval. |
A few guidelines apply to both therapies:
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Follow your device's warnings. Devices differ in strength and design, so the manufacturer's instructions are the most important safety information you have.
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Don't use either one to treat a new or unexplained problem on your own. Sudden swelling, severe or worsening pain, or a possible broken bone should be checked by a doctor first.
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Use them alongside medical care, not instead of it. Neither therapy replaces physical therapy, medicine your doctor prescribed, or treatment for a diagnosed condition.
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More isn't better. Making sessions stronger or longer than recommended won't speed up results. With PBM in particular, it may even reduce them.
Your Goal Should Determine Which Therapy You Choose
The research doesn't show that one therapy is better for everything. But once you know what you want help with, the choice becomes much clearer.
Red light therapy and PEMF work in different ways, so you don't have to pick just one. There's no known reason they can't be part of the same routine, and some clinics and athletes use both. What's missing is proof that using them together works better than using either one alone. No well-designed studies have tested the two together. If you want to try both, start one at a time so you can tell what's helping.
For most people, though, the real question is which one to start with. That depends on your goal, and this table can help you determine how best to start.
| Your main goal | What to consider | Why |
|---|---|---|
| Muscle recovery and soreness | Red light therapy | Red light has dozens of studies on exercise and recovery, compared with a few small, mixed PEMF studies. |
| Joint pain and arthritis | Red light therapy first; PEMF is a reasonable alternative | Red light's knee arthritis research is more consistent for pain; PEMF more reliably helps function than pain. |
| Long-term neck, back, or shoulder pain | Either may be worth considering | Both have positive studies; red light has more research and more home devices for specific areas. |
| Tendon and soft-tissue repair | Red light therapy | Red light has more research on tendon injuries and tissue repair, with clear guidance on dose. |
| Skin health, collagen, and wrinkles | Red light therapy | Studies show more collagen and smoother skin; PEMF has no similar research. |
| A broken bone that isn't healing | PEMF, with your doctor's guidance | Prescription PEMF bone growth stimulators are FDA-regulated for this purpose. |
| Treating through clothing, a brace, or a cast | PEMF | Magnetic fields pass through materials that block light. |
| You have a pacemaker or other implanted electronic device | Red light therapy is usually the simpler choice | PEMF often carries warnings for implanted electronics; check with your doctor either way. |
For most people shopping for a home device, the goals near the top of this table matter most: recovery, pain, tendons, and skin. That's where red light therapy has the stronger case. PEMF's clearest strength, healing broken bones, is a medical use that's best handled by an orthopedic doctor.
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Novaalab Makes Red Light Therapy Easy to Target
If red light therapy fits your goals, the next step is getting the right amount of light to the right spot, session after session. That's what Novaalab designs its devices to do. Instead of making only large panels you have to stand in front of, Novaalab makes devices shaped for specific parts of the body, as highlighted in this table. The light rests against or wraps around the area you're treating.
| Treatment area | Novaalab device | Why it fits |
|---|---|---|
| Knees and elbows | Novaa Knee Ultra | Wraps all the way around the joint, treating the front, back, and sides in one session |
| Lower and upper back | Novaa Back Pad or Novaa Deep Healing Pad XL | Covers the large muscles along the spine, where near-infrared light can reach deeper tissue |
| Feet, ankles, and heels | Novaa Light Boot | Surrounds the foot and ankle, treating the sole, heel, top of the foot, and toes at once |
| Shoulders, hips, thighs, and other muscles | Novaa Light Pad | A flexible pad that straps around muscles and joints and combines 660 nm red and 850 nm near-infrared light |
| Small spots, such as a tendon | Novaa Extra-Strength Healing Laser | Focuses light on one small area when you don't need wide coverage |
| Full body | Novaa Recovery Pod | Surrounds your body for whole-body recovery sessions |
A few features make this targeted approach especially practical:
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Research-backed wavelengths: Many Novaalab devices combine 660 nm red and 850 nm near-infrared light. These are the same main ranges used throughout photobiomodulation research on skin, muscles, and joints.
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The same dose every time: Because the device touches your body, the amount of light reaching the area doesn't change based on where you stand or sit.
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Hands-free sessions: Pads, wraps, and the Light Boot let you read, work, or rest during treatment. That makes it easier to keep up the three to five sessions a week that research relies on.
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Class II medical devices: Novaalab products including the Novaa Light Pad and Novaa Knee Ultra are Class II medical devices.
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Low-risk purchase: Novaalab offers a 60-day return window and a one-year warranty, with longer coverage available on some devices.
Browse the full lineup of Novaalab red light therapy devices to find the one that fits the area you want to treat.
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Novaa Knee Ultra
Enjoy Greater Benefits from Red Light Therapy
PEMF therapy and red light therapy share a goal: helping your cells work and repair better. But they use different energy to get there. Red light therapy boosts the mitochondria, helping cells make more energy, improving blood flow, and calming inflammation. PEMF works on cell membranes and the electrical signals that pass through them.
Those differences show up in the research. PEMF has a real, FDA-regulated role in helping broken bones heal and mixed results for joint pain. Red light therapy has more consistent results for arthritis pain, much more research on muscle recovery and soreness, support for tendon and tissue repair, and skin benefits that PEMF doesn't offer.
So if you want to ease pain, recover faster, support soft-tissue healing, or improve your skin, red light therapy is likely the better place to start. Explore Novaalab's red light therapy devices to find an easy-to-use device designed for the area you want to treat.
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