ALLOLO / RED LIGHT THERAPY

How red light therapy works

The science behind recovery, comfortable movement and healthier-looking skin. Discover how red and near-infrared light interact with your cells—and why cellular energy matters to the way your body renews itself.

Explore the benefits ↓

WHAT IS RED LIGHT THERAPY?

Red light therapy, also called photobiomodulation (PBM), uses selected wavelengths of light to stimulate cellular activity. Research connects this approach with increased cellular energy, improved post-exercise recovery, joint comfort and smoother-looking skin.

THE PROCESS

Cellular mechanisms

Your cells need energy to maintain, rebuild and renew tissue. Photobiomodulation research explores how light supports this work through mitochondrial activity and cellular signaling.

CELLULAR RESPONSE01 / MICROSCALE

01 Light absorption02 Mitochondrial response03 Cellular signaling

Illustration of proposed PBM mechanisms; cellular response depends on dose.

Explore the cellular energy & signaling study · 2011 ↗

660 NM + 850 NM

660 nm and 850 nm wavelengths

TISSUE CROSS-SECTION02 / RELATIVE DEPTH

660 nm / visible redMore concentrated in superficial tissue850 nm / near-infraredRelatively greater transmission at depth

Anatomical schematic, not a depth measurement. Both wavelengths scatter and attenuate. NIR is invisible; violet identifies its path.

660nm

660 nm red light

Visible 660 nm red light belongs to the wavelength range widely explored for skin rejuvenation. Red-light research has reported improvements in collagen density, texture and fine lines—making skin quality a key focus of this part of the spectrum.

VISIBLE RED / SKIN & COLLAGEN

ALLOLO brings 660 nm red and 850 nm near-infrared together in each three-chip LED: two wavelength bands in one flexible belt or pad, designed to fit the body area you choose.

Wavelength spectrum

Visible light → near-infrared

4005006007008009001,000 nm

WAVELENGTH COMPARISON

Red light vs. near-infrared light

Comparison	660 nmRed light	850 nmNear-infrared light
Spectral region	Visible red · 660 nm	Near-infrared · 850 nm
Tissue transmission	Stronger emphasis on skin and superficial tissue^[1]	Generally greater transmission into deeper tissue^[1]
Main research applications	Skin rejuvenation and collagen remodeling^[2]	Post-exercise muscle recovery and joint pain^[3][4]
Clinical measurements	Collagen density, skin roughness and fine lines^[2]	Muscle strength, post-exercise soreness, pain scores and knee flexion^[3][4]
Cellular findings	660 nm cell studies: increased mitochondrial activity and cell viability at selected doses^[5]	810 nm cell study: increased ATP (usable cellular energy) and ROS signaling^[6]
ALLOLO LED configuration	1 red-light emitting chip	2 near-infrared emitting chips

Penetration is a gradual loss of light with depth, not a fixed cutoff. Tissue composition, skin pigmentation and beam characteristics affect transmission.

Research below covers red and near-infrared PBM; the cited studies use different devices and wavelengths, identified in each reference.

Scientific references 6 studies +

Human tissue transmission · 660 / 830 nmIn vivo attenuation profile of 660 nm and 830 nm wavelengths on human elbow skin and calcaneus tendon of different phototypes. ↗Girasol et al. · 2024
Controlled human study · Red / broad-spectrum lightA controlled trial of fine lines, wrinkles, skin roughness and intradermal collagen density. ↗Wunsch & Matuschka · 2014
Human recovery trial · 640 / 875 / 905 nmPhotobiomodulation therapy and/or cryotherapy in skeletal muscle restitution: a randomized, double-blinded, placebo-controlled trial. ↗de Paiva et al. · 2016
Human knee trial · 830 nm laserThe effect of low-level laser in knee osteoarthritis: a double-blind, randomized, placebo-controlled trial. ↗Hegedus et al. · 2009
Laboratory study · Human skin fibroblasts · 660 nmBiphasic Dose/Response of Photobiomodulation Therapy on Culture of Human Fibroblasts. ↗Flores Luna et al. · 2020
Laboratory study · Mouse fibroblasts · 810 nmLow-Level Laser Therapy Activates NF-kB via Generation of Reactive Oxygen Species in Mouse Embryonic Fibroblasts. ↗Chen et al. · 2011

BENEFITS & RESEARCH

How can red light therapy help?

Choose a topic to see the benefits studied and the research behind them.

Soreness · Strength · Exercise recovery

Muscle recovery

Recovery is part of an active life. After demanding exercise, muscles need time to restore force and settle the soreness that can make the next workout feel harder. Photobiomodulation research explores a practical benefit: helping muscles regain strength while reducing post-exercise discomfort. The studies below measured performance and recovery, rather than relying only on how participants felt.

What studies observed

In a randomized trial of 50 men, a combined red LED, infrared LED and laser protocol applied after strenuous knee-extension exercise reduced delayed-onset muscle soreness and creatine kinase, a marker associated with muscle damage. Muscle force also recovered better than with placebo. A separate crossover study in 12 rugby players found improvements in sprint performance and perceived fatigue with light applied before exercise.

Understanding the evidence

Timing is another part of the story. In a 12-week strength-training trial, the group receiving light before training achieved greater strength gains on selected tests. Together, these trials explain the interest in light as a complement to training and recovery routines. They used defined, combined laser/LED protocols; the findings describe those treatments, with dose and timing playing an important role.

References 3 studies

Human trial · 50 men · Recovery after exercisePhotobiomodulation therapy (PBMT) and/or cryotherapy in skeletal muscle restitution, what is better? A randomized, double-blinded, placebo-controlled clinical trial.
de Paiva PR, Tomazoni SS, Johnson DS et al.
Lasers in medical science. 2016; 31(9): 1925-1933.
DOI: 10.1007/s10103-016-2071-z
Human crossover trial · 12 rugby playersPhotobiomodulation Therapy Improves Performance and Accelerates Recovery of High-Level Rugby Players in Field Test: A Randomized, Crossover, Double-Blind, Placebo-Controlled Clinical Study.
Pinto HD, Vanin AA, Miranda EF et al.
Journal of strength and conditioning research. 2016; 30(12): 3329-3338.
DOI: 10.1519/jsc.0000000000001439
Human training trial · 48 completers · 12 weeksWhat is the best moment to apply phototherapy when associated to a strength training program? A randomized, double-blinded, placebo-controlled trial : Phototherapy in association to strength training.
Vanin AA, Miranda EF, Machado CS et al.
Lasers in medical science. 2016; 31(8): 1555-1564.
DOI: 10.1007/s10103-016-2015-7

Pain · Flexibility · Everyday mobility

Joint comfort

When a joint feels sore, everyday movements can become harder to enjoy. Near-infrared photobiomodulation has been studied as a non-invasive approach to joint pain and mobility, with particular attention to knee osteoarthritis. The outcomes that matter in daily life are pain during daily life, sensitivity around the joint and the ability to bend and move comfortably.

What studies observed

In a placebo-controlled knee trial, 830 nm laser treatment was associated with lower pain, less pressure sensitivity and improved knee bending. Researchers also recorded temperature changes consistent with improved local circulation. A separate, small trial following hip replacement found that a combined laser/LED treatment reduced immediate pain and selected inflammatory markers compared with placebo. These findings connect symptom relief with measurable changes around affected tissues.

Understanding the evidence

The clinical picture varies by treatment and population. A larger 2023 trial found that adding PBM to a strengthening programme did not improve outcomes beyond exercise alone. Light is therefore best understood as a researched complementary approach to comfort, while movement and appropriate care remain central. The references show both the encouraging results and the importance of choosing protocols suited to the condition.

References 3 studies

Human placebo-controlled trial · 830 nm laserThe effect of low-level laser in knee osteoarthritis: a double-blind, randomized, placebo-controlled trial.
Hegedus B, Viharos L, Gervain M et al.
Photomedicine and laser surgery. 2009; 27(4): 577-584.
DOI: 10.1089/pho.2008.2297
Human trial · 18 patients after hip surgeryPhotobiomodulation therapy (PBMT) on acute pain and inflammation in patients who underwent total hip arthroplasty-a randomized, triple-blind, placebo-controlled clinical trial.
Langella LG, Casalechi HL, Tomazoni SS et al.
Lasers in medical science. 2018; 33(9): 1933-1940.
DOI: 10.1007/s10103-018-2558-x
Human trial · 127 participants · PBM with exercisePhotobiomodulation does not provide incremental benefits to patients with knee osteoarthritis who receive a strengthening exercises program: a randomized controlled trial.
Jorge AES, Dantas LO, Aburquerque-Sendín F et al.
Brazilian journal of physical therapy. 2023; 27(4): 100519.
DOI: 10.1016/j.bjpt.2023.100519

Fine lines · Elasticity · Collagen

Skin & collagen

Healthy-looking skin depends partly on the collagen and elastic fibres that support its structure. Red and near-infrared light have been investigated for improving skin texture, fine lines and elasticity through repeated, non-thermal exposure. The appeal is a gradual approach that works with the skin’s biological processes rather than removing its surface.

What studies observed

A randomized split-face study of 76 people tested 633 nm red light, 830 nm near-infrared light and their combination. Researchers observed improvements in wrinkles and elasticity, alongside tissue findings showing more collagen and elastic fibres and active fibroblasts—the cells involved in producing this supporting matrix. A separate controlled study of 136 volunteers reported smoother skin and increased collagen density after a course of red or broader-spectrum light treatments.

Understanding the evidence

A 2017 trial also investigated 660 nm LEDs, the red wavelength used by ALLOLO. Instrument measurements of wrinkles improved from baseline after repeated treatment, although some other assessments did not show significant differences. Across these studies, skin quality was assessed over weeks and multiple sessions. They provide a scientific basis for interest in red light for skin appearance, with results depending on the light source, exposure and assessment method.

References 3 studies

Human split-face trial · 76 participants · 633/830 nmA prospective, randomized, placebo-controlled, double-blinded, and split-face clinical study on LED phototherapy for skin rejuvenation: clinical, profilometric, histologic, ultrastructural, and biochemical evaluations and comparison of three different treatment settings.
Lee SY, Park KH, Choi JW et al.
Journal of photochemistry and photobiology. B, Biology. 2007; 88(1): 51-67.
DOI: 10.1016/j.jphotobiol.2007.04.008
Controlled human study · 136 volunteersA controlled trial to determine the efficacy of red and near-infrared light treatment in patient satisfaction, reduction of fine lines, wrinkles, skin roughness, and intradermal collagen density increase.
Wunsch A, Matuschka K.
Photomedicine and laser surgery. 2014; 32(2): 93-100.
DOI: 10.1089/pho.2013.3616
Comparative human trial · 52 women · Includes 660 nmThe Efficacy and Safety of 660 nm and 411 to 777 nm Light-Emitting Devices for Treating Wrinkles.
Nam CH, Park BC, Kim MH et al.
Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.]. 2017; 43(3): 371-380.
DOI: 10.1097/dss.0000000000000981

Immune signals · Tissue response · Repair

Inflammation

Inflammation is an essential early response to injury. Recovery also depends on that response changing at the right time, so tissue can move from defence toward rebuilding. Photobiomodulation research examines how red and near-infrared light alter immune-cell signals associated with this transition. The goal is a more favourable environment for repair, rather than switching off the immune system.

What studies observed

In laboratory macrophages—immune cells that help coordinate tissue responses—660 nm and 780 nm light reduced selected inflammatory markers, including TNF-alpha and iNOS expression. Responses differed with wavelength and timing, and not every marker decreased. In a rat muscle-injury study, light treatment shifted the balance of macrophage populations toward patterns associated with tissue regeneration and improved the repair process.

Understanding the evidence

There is also an early clinical connection. In an 18-patient trial after hip replacement, a combined laser/LED treatment reduced pain and blood levels of TNF-alpha and IL-8 compared with placebo. The laboratory and human findings together help explain why inflammation regulation is an important PBM research area. The cell and animal experiments describe biological pathways; the surgical trial addresses one specific clinical setting.

References 3 studies

Laboratory study · Mouse macrophage-like cellsPhotobiomodulation with 660-nm and 780-nm laser on activated J774 macrophage-like cells: Effect on M1 inflammatory markers.
Fernandes KP, Souza NH, Mesquita-Ferrari RA et al.
Journal of photochemistry and photobiology. B, Biology. 2015; 153: 344-351.
DOI: 10.1016/j.jphotobiol.2015.10.015
Animal study · Muscle injury and macrophage phenotypesPhotobiomodulation and different macrophages phenotypes during muscle tissue repair.
Souza NHC, Mesquita-Ferrari RA, Rodrigues MFSD et al.
Journal of cellular and molecular medicine. 2018; 22(10): 4922-4934.
DOI: 10.1111/jcmm.13757
Human placebo-controlled trial · Post-surgical inflammationPhotobiomodulation therapy (PBMT) on acute pain and inflammation in patients who underwent total hip arthroplasty-a randomized, triple-blind, placebo-controlled clinical trial.
Langella LG, Casalechi HL, Tomazoni SS et al.
Lasers in medical science. 2018; 33(9): 1933-1940.
DOI: 10.1007/s10103-018-2558-x

Granulation · Wound closure · Tissue renewal

Tissue repair

Repairing damaged skin takes coordinated work: new tissue fills the wound, its surface closes and the underlying structure remodels. Red and near-infrared phototherapy have been studied alongside wound care to support that process. Researchers track changes in wound area, granulation tissue and time to closure—concrete measures of healing rather than appearance alone.

What studies observed

In a small randomized study involving 14 people with 23 chronic diabetic leg ulcers, combined 660 nm and 890 nm LED treatment added to wound care improved granulation and healing compared with a low-dose control. Another randomized study in older adults reported faster pressure-ulcer healing with red and infrared phototherapy alongside standard treatment. These studies are part of the clinical foundation for investigating light-assisted tissue repair.

Understanding the evidence

More recently, a 2024 randomized trial found favourable clinical trends in diabetic foot-ulcer area with separate red or infrared LED treatment. This is a specialist research field: the studies used wound-care protocols, selected patients and purpose-specific devices. They illustrate how light is being investigated in tissue recovery, rather than providing instructions to treat an open wound with an ALLOLO belt or pad. Wounds require appropriate clinical care.

References 3 studies

Human randomized trial · 14 patients · 660/890 nm LEDsPhototherapy promotes healing of chronic diabetic leg ulcers that failed to respond to other therapies.
Minatel DG, Frade MA, França SC et al.
Lasers in surgery and medicine. 2009; 41(6): 433-441.
DOI: 10.1002/lsm.20789
Human randomized study · Pressure ulcersEffects of phototherapy on pressure ulcer healing in elderly patients after a falling trauma. A prospective, randomized, controlled study.
Schubert V.
Photodermatology, photoimmunology & photomedicine. 2001; 17(1): 32-38.
DOI: 10.1034/j.1600-0781.2001.017001032.x
Human randomized trial · Diabetic foot ulcers · 12 weeksPhotobiomodulation using red and infrared spectrum light emitting-diode (LED) for the healing of diabetic foot ulcers: a controlled randomized clinical trial.
Borges NCS, Soares LR, Perissini MM et al.
Lasers in medical science. 2024; 39(1): 253.
DOI: 10.1007/s10103-024-04199-5

Mitochondria · ATP · Glucose use

Energy & metabolism

Metabolism is how cells process fuel to support their work. Mitochondria help turn nutrients into ATP, the energy-carrying molecule used for activities such as protein production, transport and muscle contraction. Photobiomodulation studies connect light exposure with changes in ATP availability and oxidative stress, making cellular energy one of the most interesting areas of red-light research.

What studies observed

In mouse fibroblast cultures, 810 nm light increased ATP and reduced reactive oxygen species when glucose was available. A separate study of rat retinal support cells found that 670 nm light preserved mitochondrial integrity and reduced oxidative stress under high-glucose conditions. These experiments help explain how light can alter cellular energy handling and stress signals under defined laboratory conditions.

Understanding the evidence

A 2024 human study extended this question to glucose handling: a 15-minute exposure to 670 nm light reduced the blood-glucose rise during a subsequent glucose-tolerance test. That is an encouraging early finding about energy metabolism. It is distinct from demonstrating increased daily calorie burning, weight loss or diabetes treatment. For ALLOLO, this section explains the developing science of cellular energy; it does not present metabolic outcomes as proven effects of our products.

References 3 studies

Laboratory study · Mouse fibroblasts · 810 nmGlucose Improves the Efficacy of Photobiomodulation in Changing ATP and ROS Levels in Mouse Fibroblast Cell Cultures.
Hoh Kam J, Mitrofanis J.
Cells. 2023; 12(21): 2533.
DOI: 10.3390/cells12212533
Laboratory study · Rat retinal support cells · 670 nm670nm photobiomodulation modulates bioenergetics and oxidative stress, in rat Müller cells challenged with high glucose.
Nonarath HJ, Hall AE, SenthilKumar G et al.
PloS one. 2021; 16(12): e0260968.
DOI: 10.1371/journal.pone.0260968
Early human study · 670 nm · Glucose-tolerance testLight stimulation of mitochondria reduces blood glucose levels.
Powner MB, Jeffery G.
Journal of biophotonics. 2024; 17(5): e202300521.
DOI: 10.1002/jbio.202300521

Research library: these studies investigated different light sources, doses and populations, not ALLOLO products. Human, animal and laboratory evidence is identified beside each reference. Results vary with treatment and individual response.

Sources & research context+

These summaries describe published photobiomodulation research, including laboratory experiments and human trials using different devices and protocols. They provide scientific background, not ALLOLO-specific clinical validation. Outcomes vary with treatment and the individual. The mitochondrial explanation is a leading model that continues to be studied.

Frequently asked questions

What makes red light therapy different from heat?+

Light therapy works through the interaction of photons with tissue and light-sensitive molecules in cells. This process, called photobiomodulation, is studied for its effects on cellular energy and signaling. Heat therapy works primarily by warming tissue.

Why is ATP important for recovery?+

ATP supplies the energy cells use to contract muscles, build proteins and maintain their internal balance. PBM studies have measured increases in cellular ATP under specific conditions, helping explain the scientific interest in light as a tool for recovery and renewal.

Why use both red and near-infrared light?+

The two bands have different tissue-transmission profiles. Red light is widely researched for skin quality and collagen, while near-infrared generally reaches farther into tissue and features in muscle and joint research. ALLOLO combines both bands in a single flexible format.

How does red light relate to collagen and skin texture?+

Collagen is part of the skin’s supporting structure. Human light-therapy studies have reported increased collagen density together with smoother skin and improvements in fine lines. These findings explain why skin rejuvenation is a major area of PBM research.

What determines the response to light therapy?+

Wavelength, light intensity, exposure time and the tissue being treated work together to shape the response. Effective PBM is about an appropriate dose, rather than maximum brightness or time. Research therefore evaluates complete treatment protocols, not wavelength alone.

How red light therapy works

Cellular mechanisms

660 nm and 850 nm wavelengths

660 nm red light

850 nm near-infrared light

Wavelength spectrum

Red light vs. near-infrared light

Muscle recovery

What studies observed

Understanding the evidence

Joint comfort

What studies observed

Understanding the evidence

Skin & collagen

What studies observed

Understanding the evidence

Inflammation

What studies observed

Understanding the evidence

Tissue repair

What studies observed

Understanding the evidence

Energy & metabolism

What studies observed

Understanding the evidence

Frequently asked questions