Red Light Therapy Myths vs Facts: LED, Laser, Fat Loss and More

Red light therapy attracts big promises and loud scepticism. This page looks at five common questions and sets out what researchers have actually reported, with the limits of each finding. We’re not trying to talk anyone into or out of anything.

Before you read on: research findings come from specific devices, settings and groups of people. They may not apply to any particular device or person.

This is general information, not medical advice. For questions about your health, please talk with your GP or another health professional.

LED vs laser: is red light therapy the same as laser therapy?

Is red light therapy the same as laser therapy? Not exactly. Lasers produce a narrow, coherent beam, while LEDs produce a broader, non-coherent spread of light over a wider area. LEDs and diode lasers are built on the same basic semiconductor principle.[1]

Red light therapy LED vs laser: does it matter? A 2018 review by Heiskanen and Hamblin looked at studies comparing lasers with LEDs and other light sources. The authors concluded that the evidence appeared to support the idea that light’s effects don’t depend on lasers or coherence. Limits: they rated most head-to-head comparisons as low quality, because it’s hard to match a laser and an LED for spot size, bandwidth and power density. They noted that whether lasers and LEDs are equivalent remained the most debated question in the field.[1]

What researchers focus on instead is dose: the wavelength, intensity, time and number of sessions that actually reach the tissue. De Freitas and Hamblin described a biphasic response, where too little or too much light may produce no measurable effect.[5]

LED or laser? The LED vs laser mask question: A 2026 systematic review of at-home devices for facial skin looked only at LED devices and excluded laser-based systems.[2] So the home skin research summarised in red light therapy for skin comes from LEDs. We didn’t find comparable research on laser masks.

Laser vs LED for hair growth: hair is outside the scope of this page, and the evidence for hair differs from the skin evidence. We don’t make hair claims.

Red light therapy and face fat: what the research looks at

Our sources don’t support the idea that near-infrared light shrinks facial fat. The fat-related studies we reviewed applied light mostly to the abdomen, often with clinic lasers at set doses, in people with overweight or obesity.[3][4] None of them studied facial fat, and the 2026 at-home face review measured wrinkles, elasticity and texture, not fat.[2]

So if you’ve seen fat loss Reddit threads, “fat loss face Reddit” posts or “fat loss before and after” photos, the research we could find doesn’t speak to faces or home devices. Before-and-after photos also vary with lighting, angle, posture and weight changes.

Red light therapy belts and fat loss: what the studies found

Two 2025 reviews looked at red light therapy fat loss research, and their results were mixed.

• A 2025 meta-analysis (Sun and colleagues) pooled 11 randomised trials with 569 participants. Compared with diet, exercise or sham light, groups given light had lower waist measurements, weight and BMI on average. Limits: there was no significant difference in body-fat percentage. The authors rated the certainty of the evidence from very low (body-fat percentage) to moderate (waist). Trials were small, most used lasers rather than belts, light was often given alongside diet or exercise, and none followed people for more than six months.[3]
• A 2025 review in Obesity Reviews (Jiménez-García and colleagues) included 18 human studies of light applied to the abdomen. It found no significant differences in weight, BMI, fat mass or lean mass. It did find differences in waist and hip measurements. Limits: most studies used lasers, settings varied widely, and several had a high risk of bias.[4]

Red light therapy belt fat loss: one review noted that LED belts for the abdomen exist,[1] and only one trial in the 2025 meta-analysis used LED abdominal straps.[3] So there’s little direct research on home belts. Neither review supports describing light as a way to lose fat on its own.

Red light therapy and mitochondrial function: the science so far

Red light therapy mitochondria claims: the most widely discussed theory is that red and near-infrared light act on mitochondria, the parts of cells that produce energy. De Freitas and Hamblin described an enzyme called cytochrome c oxidase as a key light-absorbing molecule. Their leading hypothesis was that light frees nitric oxide from this enzyme, so energy production (ATP) can increase.[5]

This is still debated. Quirk and Whelan found no reliable demonstration of a light-driven effect on cytochrome c oxidase, and suggested nitric oxide production may matter more.[6] Sommer concluded that cytochrome c oxidase “is not the primary acceptor” of this light.[7] So “mitochondrial function” explanations are theories, not settled fact. See what the research says.

You may also see online claims that mitochondria decline by a set percentage every year after a certain age. None of the sources on this page support claims like that.

Where red light fits, and where it doesn’t

Promising lab ideas don’t always carry over to people. A small 2026 study gave five children and young people with a rare inherited condition affecting mitochondria a daily three-minute dose of 660–670 nm light for up to 18 months. Researchers found no clinically meaningful change in droopy eyelids, and no adverse events from the light were reported. Limits: the study was tiny and not blinded, and two authors were co-directors of a company developing a red-light wearable.[8]

Is red light therapy legit? How to choose with confidence

Is red light therapy a hoax? Is red light therapy legit? Neither “hoax” nor “miracle” fits. It’s an active research area. Some controlled studies have reported modest changes in specific measures, such as facial wrinkle scores. Other questions have mixed results or have barely been studied. Evidence differs by use, device and dose.[1][2][3][4]

How to spot hype:

• Published specs at a stated distance. Look for wavelength and irradiance (mW/cm²) measured at a stated distance, not just “more LEDs”. See how to choose a red light therapy device.
• Original studies over brand summaries. Check who was studied, how many people, for how long, whether there was a comparison group, and who funded it.
• No cure or condition claims. Be cautious of promises of fat loss, healing or dramatic results.
• Check the ARTG. If a device is promoted for a therapeutic purpose, check its ARTG entry. See our guide to TGA and ARTG.
• Be wary of before-and-after photos. Lighting, angles, makeup and editing can change how they look.
• Safety information. Look for specific eye-safety guidance. See is red light therapy safe?

FAQ

Is red light therapy the same as laser therapy? No. Lasers and LEDs are different light sources. A 2018 review suggested effects don’t depend on lasers, but rated the comparison studies as mostly low quality.[1]

Does red light therapy cause fat loss? We don’t make that claim. Two 2025 reviews reported mixed results, mostly from clinic lasers on the abdomen, with no significant change in body-fat percentage or fat mass.[3][4]

Will a red light belt help me lose weight? There’s little direct research on home belts.[3]

Is the mitochondria theory proven? No. It’s a leading theory that researchers still debate.[5][6][7]

Is red light therapy legit? It’s an active research area with modest, mixed evidence that varies by use.[2][3]

For personal advice, please talk with your GP or another health professional before starting any new routine.

Related reading on our blog

• Photobiomodulation explained: the science behind red light
• Medical grade red light therapy devices in Australia: what it means
• Red light therapy and the TGA in Australia: what the rules actually say

Sources

1. Heiskanen V, Hamblin MR. Photobiomodulation: lasers vs. light emitting diodes? Photochemical & Photobiological Sciences. 2018;17(8):1003–1017. https://doi.org/10.1039/c8pp90049c (open access: https://ncbi.nlm.nih.gov/pmc/articles/PMC6091542/)
2. Das RK, Thayer WP, Kubiak CA, et al. Efficacy and safety of at-home light-emitting diode photobiomodulation for facial rejuvenation: a systematic review. Aesthetic Plastic Surgery. 2026. https://link.springer.com/article/10.1007/s00266-026-06333-w
3. Sun W, Zhuang Z, Yang L, Zhou J, Zhang L, Yuan J. Effectiveness of photobiomodulation therapy in improving health indicators in obese patients: a systematic review and meta-analysis of RCTs. BMC Complementary Medicine and Therapies. 2025;25(1):133. https://doi.org/10.1186/s12906-025-04874-2
4. Jiménez-García AM, et al. Transabdominal photobiomodulation applications: a systematic review and meta-analysis. Obesity Reviews. 2025. https://doi.org/10.1111/obr.13921
5. de Freitas LF, Hamblin MR. Proposed mechanisms of photobiomodulation or low-level light therapy. IEEE Journal of Selected Topics in Quantum Electronics. 2016;22(3). https://doi.org/10.1109/JSTQE.2016.2561201
6. Quirk BJ, Whelan HT. What lies at the heart of photobiomodulation: light, cytochrome c oxidase, and nitric oxide. Review of the evidence. Photobiomodulation, Photomedicine, and Laser Surgery. 2020. https://doi.org/10.1089/photob.2020.4905
7. Sommer AP. Revisiting the photon/cell interaction mechanism in low-level light therapy. Photobiomodulation, Photomedicine, and Laser Surgery. 2019. https://doi.org/10.1089/photob.2018.4606
8. Dahlmann-Noor A, Bowman R, Lim A, McFarland R, Jeffery G. Deep red light for ptosis in primary mitochondrial conditions in children and young people: a proof of concept study. Orphanet Journal of Rare Diseases. 2026. https://doi.org/10.1186/s13023-026-04632-8