Red Light Therapy: What the Evidence Says | CFBC

Red Light Therapy: What the Evidence Says | CFBC from CrossFit BC. Photobiomodulation, honestly assessed: what red and near-infrared light does for recovery and performance, where the evidence is thin, and how to use it.

This is a long-form CrossFit BC reference piece. We cite the research we lean on, show how we apply it with members in the gym, and keep the practical takeaways at the top so you can act on them the same week.

Common questions

Does red light therapy actually work for recovery?

For muscle fatigue and soreness, yes, modestly. Meta-analyses report that photobiomodulation applied before exercise delays fatigue and improves strength-task performance, and a 2025 meta-analysis found a moderate reduction in delayed onset muscle soreness versus placebo. The effect sizes are real but small, and they depend heavily on dose. It sits behind sleep, protein and sensible training load in any honest ranking.

How long should a red light session be?

Short. Photobiomodulation follows a biphasic dose response, meaning too little light does nothing and too much can reverse the benefit. Most protocols land between 5 and 15 minutes per area at a stated distance. Doubling your session time because it feels insufficient is the most common self-inflicted mistake.

Should I use red light before or after training?

Before, if you are chasing performance and fatigue resistance, since that is how most of the positive trials were run. After, if you are chasing soreness relief. Doing both is fine as long as each session stays short.

What wavelengths should a panel have?

Red at roughly 660 nm and near-infrared at roughly 850 nm cover the studied bands. More important than the headline number is whether the manufacturer states irradiance at a named distance. An irradiance figure with no distance attached tells you nothing.

Is red light therapy safe?

For most healthy adults, used briefly and as directed, it is low risk and trials report few adverse effects. Do not look into the array, since near-infrared is invisible and will not trigger your blink reflex, and wear the supplied eye protection on high-output panels. Check with your physician first if you take photosensitising medication or are managing a skin, eye or oncological condition.

Does red light therapy improve sleep?

The evidence is preliminary. A 2026 systematic review found plausible mechanisms and some small trials suggesting benefit, but sample sizes are small, protocols vary widely, and no large well-powered trial exists yet. Treat sleep benefits as an unproven bonus rather than the reason to buy a device.

Are red light panels FDA approved?

Usually not. Most consumer panels are sold under the general wellness policy for low-risk devices, which requires making no disease claims. Some devices hold 510(k) clearance for specific claims such as temporary relief of muscle and joint pain. Clearance and approval are different things, and any product marketed as FDA approved is worth a second look.

Do you have red light therapy at CrossFit BC?

We do not sell light panels. We coach the parts of recovery with the biggest return: training load, sleep, protein and mobility. For red light, sauna, cold plunge and contrast work we point members to vetted Vancouver studios on our recovery map.