An Overview of Violet Light Therapy

All studies carried out to obtain FDA-clearance are double blind, randomised, placebo-controlled, and multi-site – the most credible research of all Laser Therapy devices on the market today.

The following list shows the clinical trials and an outline of their progress. As a company, to protect our intellectual assets, not all clinical trials we are involved with are made public so as to maintain our competitive advantage. As such, not all clinical trials are listed below.

Please note: There are hundreds of clinical studies confirming the effectiveness of Low-Level Laser Therapy, and every year there are many new publications. Below is a list of Erchonia-specific studies for FDA-clearance.

1) Chronic Neck and Shoulder Pain / Low Level Laser — 2000 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. First study done in support of 510(k) submission, second study requested by FDA.

2) Chronic Neck and Shoulder Pain / Low Level Laser — 2001 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. Study results used to obtain FDA clearance – K012580
2. To view NIH clinical trial records, click here.

3) Low Level Laser Light Therapy as an Aid to Liposuction and Reduction of Pain Associated With Surgery — 2004 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. Study results used to obtain FDA clearance –K041139
2. To view NIH clinical trial records, click here.

4) Acne Vulgaris — Dermatological Conditions / Low Level Laser — 2005 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. FDA clearance – K050672

5) Pain Associated With Breast Augmentation Surgery / Low Level Laser — 2007 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. Results used to obtain FDA clearance – K072206
2. To view NIH clinical trial records, click here.

6) Non-Invasive Fat Reduction and Body Contouring – Laser Scanner Waist, Hips, and Thighs — 2009 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. Study results used to obtain FDA clearance – K082609
2. To view NIH clinical trial records, click here.

7) Equine Wound Healing – 2011 — Sponsor, Case Study.

1. Study completed from Nov. 2010-March 2011.
2. Monitored by Hank Jann, DVM, MS, DACVS from Oklahoma State University.

8) Equine Wound Healing – 2011 — Sponsor, placebo controlled, clinical study.

1. Study completed from Feb. 2011-April 2011.
2. Monitored by Hank Jann, DVM, MS, DAVCS from Oklahoma State University.

9) Arm Circumference Reduction of the Upper Arms — 2011 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. Study results used to obtain FDA clearance – K120257
2. Study submitted to be published 2012.
3. To view NIH clinical trial records, click here.

10) Appearance of Cellulite (Verju Laser System) — 2012 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. FDA clearance – K130922
2. Study submitted to be published 2013.
3. To view NIH clinical trial records, click here.

11) Non-Invasive Body Contouring Using GLS Laser – 532 nm (Green) Trade Name Verju — 2012 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. FDA clearance – K123237
2. Study submitted to be published 2013.
3. To view NIH clinical trial records, click here.

12) Adjunct to Chronic Heel Pain Arising from Plantar Fasciitis Using the Erchonia FX635 Laser — 2012 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. FDA clearance – K132940
2. Study results published in the American Orthopaedic Foot & Ankle Society April 2014
3. To view NIH clinical trial records, click here.

13) Non-Invasive Dermatological Aesthetic Treatment for Reduction of Circumference of Hips, Waist and Upper Abdomen When Applied to Individuals with a Body Mass Index (BMI) Between 30 kg/m2 and 40 kg/m2 — 2013 – Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. FDA clearance – K142042
2. To view NIH clinical trial records, click here.

14) Non-Invasive Dermatological Aesthetic Treatment for the Reduction of Circumference of Hips, Waist and Thighs (Zerona-Z6 OTC) — 2012 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. FDA clearance – K143007
2. To view NIH clinical trial records, click here.

15) Non-Invasive Dermatological Aesthetic Treatment for the Reduction of Circumference of Hips, Waist, Thighs and Upper Abdomen — 6 Week Treatment Protocol (Zerona-Z6) — 2014 — Sponsor and monitor, IRB approved, double blind, placebo controlled, multi-site, clinical study.

1. FDA clearance – K150446
2. To view NIH clinical trial records, click here.

16) Erchonia EVRL (EVRL) – 2016

       a. while using the red diode, for adjunctive use in providing temporary relief of minor chronic neck and shoulder pain of musculoskeletal origin.

       b. and while using the violet diode, to treat dermatological conditions, and specifically indicated to treat moderate inflammatory Acne Vulgaris.

1. FDA clearance – K152196

17) Temporary Increase of Clear Nail in Patients With Onychomycosis (e.g., Dermatophytes Trichophyton Rubrum and T. mentagrophytes, and/or Yeasts Candida Albicans, etc.) (Lunula Laser ) — 2016 — Sponsor and monitor, IRB approved, blind, placebo controlled, clinical study.

1. FDA clearance – K153164
2. To view NIH clinical trial records, click here.

18) Non-Invasive Dermatological Aesthetic Treatment for the Reduction of Body Circumference (Zerona-Z6) — 2016.

1. FDA clearance – K162578

19) Market Clearance to Treat Chronic Low Back Pain (FX 635) — 2018 — Placebo-controlled, randomized, double-blind, parallel-group, multi-center clinical study.

1. FDA clearance – K180197
2. To view NIH clinical trial records, click here.

20) Market Clearance for Relief of Chronic Musculoskeletal Pain (FX 635) — 2019 — A collection of placebo-controlled, randomized, double-blind, parallel-group, multi-center clinical studies.

1. FDA clearance – K190572

21) Non-Invasive Dermatological Aesthetic Treatment for the Reduction of Body Circumference in Individuals With a Body Mass Index (BMI) of up to 40 kg / m² — 2019 — The data used to get this approval combined all previous data Erchonia® had on 20-40 BMI patients in the green laser studies above.

While the benefits of Low-Level Laser Therapy have been observed in hundreds of medical studies, the exact mechanisms that lead to these results are still being explored. Although we still have a lot to learn about the effects of light energy on different types of cells, the leading theory is that LLLT generates therapeutic effects through stimulating and enhancing specific biochemical processes within cells. Intuitively speaking, laser energy activates a key enzyme in our cells’ powerhouses (mitochondria), boosting energy production and cellular activity. This process enhances cell function, aids in cell repair and growth, and supports overall cellular health, leading to improved healing and regeneration.

More specifically, utilising the first law in photochemistry (Grotthuss-Draper law), laser energy is transferred to cytochrome c oxidase (CcO) – a respiratory energy-transducing enzyme which is involved in the electron transport chain in mitochondria. This energy transfer causes photodissociation of inhibitory nitric oxide from CcO, leading to an enhancement of enzyme activity, electron transport, mitochondrial respiration, and adenosine triphosphate (ATP) production. Consequently, by altering the cellular redox state, LLLT induces the activation of numerous intracellular signalling pathways, and alters the affinity of transcription factors concerned with cell proliferation, survival, repair, and regeneration.

Erchonia® pain relief lasers utilise true laser technology, optimising photonic energy delivery through the use of monochromatic, collimated, and coherent beams of light. That is, the light emitted by a true laser is composed from photons that have the same wavelength (monochromatic), travel in the same direction / do not disperse (collimated), and are in phase in space and time (coherent). These three properties of true lasers make them the most effective and efficient devices within the Laser Therapy sector.

Erchonia® lasers were specifically designed to deliver the optimal amount of energy required to stimulate and enhance cell function while not damaging cells or producing painful heat sensations – all of our non-thermal Low-Level Laser Therapy devices are classified as ‘Class II Lasers’ by the FDA in virtue of their low output and very low risk of hazard.

Erchonia® fat removal lasers create a small transitory pore for the fatty liquids in fat cells to seep out. The fatty liquids are then naturally flushed out through the lymphatic system.

The result is that the fat cells shrink instead of being killed. When this happens, the shrunken fat cells begin to act and function like healthy lean cells, releasing the correct messages to the brain and creating a communication effect throughout the fat organ, causing other fat cells to release their content and return their hormone responses to the positive.

Procedures that have been popular in the past (such as fat freezing) focus on the elimination of fat cells, but recent research has shown this approach to be less effective, and in the worst-case scenario, providing counterproductive results.

Erchonia® lasers effectively train fat cells to behave and react differently, and all without excessive heat or cooling.

Erchonia® lasers for fungal nail treatment target onychomycosis through the use of two true laser beams (red 635nm and violet 405nm – monochromatic, collimated, and coherent).

The two wavelengths trigger a photochemical reaction, producing Reactive Oxygen Species which is converted to Hydrogen Peroxide – a natural antiseptic that kills onychomycosis.

In addition, the red 635nm wavelength induces the production of Adenosine Triphosphate (ATP) which is converted to Nitric Oxide – aiding the natural immune response in fighting the infection.

Clinical studies and trials of Laser Therapy technologies indicate the following beneficial effects of Low-Level Laser Therapy (LLLT).

1. Anti-Inflammation. LLLT creates an anti-edema effect by dilating blood vessels and activating the lymphatic drainage system (which drains swollen areas). This reduces swelling caused by trauma or inflammation.
2. Anti-Pain (Analgesic). LLLT exerts a very beneficial effect on pain in multiple ways: It partially blocks neural transmission of pain signals to the brain; It decreases nerve sensitivity; It lessens pain by reducing edema; It helps to increase the production of high levels of painkilling chemicals such as endorphins, enkephalins, and opioids from the brain and adrenal gland.
3. Accelerated Tissue Repair and Cell Growth. Photons of light from lasers penetrate deeply into tissues and accelerate cellular reproduction and growth. The laser light also increases the energy available to the cell by increasing ATP production so that the cell can take on nutrients faster and get rid of waste products. As a result of exposure to laser light, all cells, including the cells of tendons, ligaments, and muscles, are repaired faster.
4. Improved Vascular Activity. LLLT significantly increases the formation of new capillaries in damaged tissue, which speeds up the healing process, closes wounds more quickly, and reduces scarring. LLLT also causes vasodilation – an increase in the diameter of blood vessels – which improves the delivery of blood and healing elements to damaged tissues.
5. Increased Metabolic Activity. LLLT stimulates higher outputs of specific pro-healing enzymes in blood cells, along with improved oxygen and nutrient delivery.
6. Trigger Points and Acupuncture Points. LLLT stimulates muscle trigger points and acupuncture points on a non-invasive basis, providing musculoskeletal pain relief.
7. Reduced Fibrous Tissue Formation. LLLT reduces the formation of scar tissue following damage from cuts, scratches, burns, or surgery.
8. Improved Nerve Function. Slow recovery of nerves in damaged tissue results in impaired sensory and motor function. LLLT speeds up the process of axonal regeneration and nerve cell reconnection, and increases the amplitude of action potentials to optimize muscle action.
9. Immunoregulation. LLLT directly affects immunity status by stimulating the production of immunoglobulins and lymphocytes, and by improving the ease of penetration of white blood cells into damaged tissue.
10. Faster Wound Healing. LLLT stimulates fibroblast development in damaged tissue. Fibroblasts are the building blocks of collagen, which is the essential protein required to replace old tissue or repair tissue injuries. As a result, LLLT is effective on open wounds and burns.

The efficacy of Erchonia® lasers has been scientifically proven with double blind, randomised, placebo-controlled, and multi-site studies. Many competing companies advertise their products as ‘clinically proven’, guaranteeing ‘instant results’. However, these claims are often not backed by comprehensive clinical evidence.

Several companies have FDA-clearance within the Laser Therapy sector, however, in most cases the intended use / indications of their products are quite limiting or not relevant to the marketed applications. Furthermore, these FDA-clearances are often obtained without any scientific research.

We always recommend that you ask for details of the FDA-clearances and make an informed decision. Pay particular attention to the scope of the clearance, whether it involved clinical studies, how many patients participated, were the studies placebo controlled, double blind, and randomised, how many peer reviewed published articles they have, and what the adverse reactions / side effects were – we would be happy to provide this information for you.

To understand the difference between the various types of Laser Therapy devices, it is first important to distinguish between High-Level Laser Therapy (HLLT) and Low-Level Laser Therapy (LLLT):

• HLLT devices are classified as ‘Class IV Lasers’ by the FDA in virtue of having a power output that’s greater than 500mW (i.e. high risk of hazard). The vast majority of HLLT devices have longer near-infrared wavelengths.
• LLLT devices are classified as either ‘Class IIIB Lasers’, ‘Class IIIR Lasers’, or ‘Class II Lasers’ in virtue of having a power output of 5-500mW, 1-5mW, or <1mW respectively (i.e. lower risk of hazard). The vast majority of LLLT devices have shorter wavelengths.

There is a common misconception, often propagated by the manufacturers of Class 4 Lasers, that high power with longer wavelengths results in:

1. Deeper penetration, allowing for the treatment of a wider range of conditions.
2. More efficacious results, due to the delivery of more energy into the cells.

This however, is not correct for the following well-documented reasons:

1. Laser light with wavelengths exceeding 950nm is highly absorbed by water, preventing much of its energy from penetrating the dermis. This strong absorption can also cause localised heating, leading to discomfort or pain, which may restrict its therapeutic application.
2. There is an optimal ‘dose’ of laser energy (typically 2-4 joules / cm²) required for therapeutic biostimulation. Deviating from this dose, either by providing significantly less or more energy, can be counterproductive. HLLT devices, with their substantial power outputs, risk surpassing this optimal range.
3. It is theorised that a minimum energy of 1.7eV per photon is required for therapeutic biostimulation via photochemical means – wavelengths exceeding 730nm cannot deliver this 1.7eV. As a result, HLLT devices, which often operate within these longer wavelengths, may not primarily function through inducing photochemical reactions. Instead, they might rely on alternative mechanisms, such as the therapeutic influence of localised heat generation. However, this approach may be less efficacious compared to biostimulation by photochemistry.

LLLT devices, on the other hand, aim to deliver energy via low output, short wavelength beams of light. The general theory is that this approach transfers the optimal amount of energy for stimulating and enhancing cell function, while not damaging cells or producing painful heat sensations.

Within the LLLT sector however, some of the higher output devices still generate heat / pain. Furthermore, many devices are advertised as ‘lasers’, when in fact they are Light Emitting Diodes (LEDs) or Superluminescent Diodes (SLDs). In contrast to LEDs or SLDs, ‘true’ lasers generate monochromatic, collimated, and coherent beams of light. These three properties of true lasers make them the most effective and efficient LLLT devices (c.f. ‘How do Erchonia® Lasers for Pain Relief Work?’ FAQ).

To separate Erchonia® from such technologies, and from HLLT more generally, we say that Erchonia® lasers are ‘non-thermal, true lasers’. That is, our lasers do not produce any heat or painful sensations, and are monochromatic, collimated, and coherent.

Erchonia® lasers utilise three primary wavelengths – red (635nm), green (520nm), and violet (405nm) – each uniquely affecting the body at a cellular level. These wavelengths target different biological pathways, delivering distinct therapeutic benefits, which can be summarised as follows:

1. Red Light (e.g. 635nm) – Pain Relief, Tissue Repair & Nail Fungus Treatment: Red light is optimal for stimulating Complex IV of the electron transport chain, enhancing ATP (cellular energy) production. This leads to accelerated tissue repair, reduced inflammation, and improved immune function via increased Interleukin-10 (IL-10). It is widely used for musculoskeletal pain relief, wound healing, and nerve regeneration. Additionally, red light plays a role in treating fungal nail infections, working in combination with violet light to promote an antifungal response​.
2. Green Light (e.g. 520nm) – Fat Loss, Collagen Production & Cellular Regeneration: Green light uniquely stimulates Complex III, supporting stem cell activation, collagen synthesis, and chondrocyte function. It has been FDA-cleared for pain and inflammation reduction and is particularly effective in fat loss treatments. The current theory also suggests that green light helps create transient pores in fat cells (adipocytes), allowing lipids to be released and metabolised naturally through the lymphatic system. Unlike fat freezing techniques that eliminate fat cells, green laser therapy encourages them to function like healthy, lean cells, restoring proper metabolic signalling​.
3. Violet Light (e.g. 405nm) – Antimicrobial, Scar Tissue Repair & Nail Fungus Treatment: Violet light has the highest photon energy per wavelength, making it uniquely effective for Complexes I and II of the mitochondria. It is particularly valuable for antimicrobial applications, helping to combat bacteria, fungi, and viruses. When used alongside red light, violet laser therapy enhances the body’s natural antifungal response by generating Reactive Oxygen Species (ROS) that convert into hydrogen peroxide, a natural antiseptic that kills fungal infections. This makes it an ideal treatment for onychomycosis (fungal nail infections)​.
4. Combining Wavelengths for Enhanced Results: By combining red, green, and violet wavelengths, treatments can target multiple biological pathways, improving pain relief, fat metabolism, immune response, and tissue regeneration. Clinical research has demonstrated that using a combination of these wavelengths leads to superior results compared to single-wavelength treatments​.

Erchonia® lasers utilise true laser technology, optimising photonic energy delivery through the use of monochromatic, collimated, and coherent beams of light. That is, the light emitted by a true laser is composed from photons that have the same wavelength (monochromatic), travel in the same direction / do not disperse (collimated), and are in phase in space and time (coherent). These three properties of true lasers make them the most effective and efficient devices within the Laser Therapy sector.

Erchonia® lasers were specifically designed to deliver the optimal amount of energy required to stimulate and enhance cell function while not damaging cells or producing painful heat sensations – all of our non-thermal Low-Level Laser Therapy devices are classified as ‘Class II Lasers’ by the FDA in virtue of their low output and very low risk of hazard.

Erchonia® pain relief lasers can help a wide variety of patients, including: Orthopaedic pain – sprains, whiplash, muscular pain, cervical or lumbar radiculopathy, tendinitis, and carpal tunnel syndrome. Our devices have also shown positive effects on individuals with chronic conditions like arthritis and osteoarthritis, and in treating post-surgical pain; Neuropathic pain, including various types of neuralgia and diabetic neuropathy; Pain management for athletes recovering from training or injuries.

Erchonia® lasers for fat removal treat overall body circumference while also allowing your clients to target stubborn areas of fat and cellulite.

Most people who undergo the treatments focus on their midriff and thighs, but the device can also target any area of subcutaneous fat, including bra strap, upper arms, jowls, knees, and more.

There are no code regulated contraindications, however, since there are no long-term evaluations on certain conditions, we do not recommend using Erchonia® non-thermal lasers on pregnant women, clients with a pacemaker, or clients with photosensitive epilepsy. We also do not recommend using our devices over an area of known cancer.

Erchonia® are true Non-Thermal Low-Level Lasers and cause no pain or health risks.

Erchonia® lasers are used in many areas, such as 360-degree fat loss, body sculpting, cellulite reduction, pain management, pre / postsurgical healing, pre / rehabilitation, nail and skin pathologies (e.g. nail fungus and acne), and more.

The most effective, medical-grade devices for pain relief include XLR8®, EVRL®, GVL®, FX635®, FX405®, and Base Station. For fat reduction and body contouring, Emerald™, Verjú®, and VZ8 deliver exceptional results. The Lunula® Laser stands out as the only fully automated Low-Level Laser Therapy device FDA-cleared for fungal nail treatment. Each device is backed by robust clinical research and FDA clearances, ensuring the highest level of safety and efficacy​.

With over 25 years of experience, 18,000+ devices in the market, and 22 FDA-clearances, Erchonia® Corporation are world leaders in medical-grade Laser Therapy technology for physicians, chiropractors, physical therapists, podiatrists, osteopaths, aesthetics clinics, veterinarians, and many other types of medical / health professionals.

Erchonia® own 22 of the 25 FDA-clearances given to Low-Level Lasers, and the efficacy of our devices has been proven by multiple (level 1) double blind, randomised, placebo-controlled, and multi-site clinical studies – the most credible research in the market today.

All Erchonia® laser systems are cut from raw materials, and all of our products go through a rigorous quality control process before delivery to our customers around the world. As a company, we are 85% self-reliant in all facets of our organisation, and all of our products are FDA, ISO, OSHA, and MDSAP compliant.

The Erchonia® mission statement is simply “Quality Not Compromise”, and this is ingrained in every aspect of our business – from an unwavering belief in the limitless potential applications of Low-Level Lasers, down to the care and quality of the smallest component of our devices. Just pick up any Erchonia® product, feel the quality of workmanship, and see the attention to detail that can only come from Erchonia’s near-complete control of the manufacturing and assembly processes that go into each product bearing the Erchonia® name. Read More