Does Infrared Light Therapy Work? What the Science Says About Light and Health

Does infrared light therapy work, and could something as simple as light exposure be as important to your health as nutrition, sleep, and exercise? Emerging research suggests the answer may be yes — and that our modern indoor lifestyles are creating a hidden health crisis.

Here’s a striking fact: mortality from nearly all diseases peaks during winter months. While we’ve long attributed this to factors like spending more time indoors, reduced physical activity, and lower food quality, scientists are now pointing to another powerful variable — lack of proper light exposure. 🌄

Why Light Exposure Matters for Health

Dr. Roger Seuhelt, a quadruple-board-certified ICU physician based in the Blue Zone of Loma Linda, California, has become one of the leading voices on the connection between light and human health. As the host of the award-winning vidcast MedCram (with over 1 million subscribers), Dr. Seuhelt dedicates significant effort to explaining medical research clearly for the public — and light exposure has become one of his central topics.

In a comprehensive two-hour interview covering the current state of the science, Dr. Seuhelt explains how light affects nearly every system in the human body. The mechanisms are complex, involving everything from vitamin D synthesis to circadian rhythm regulation to direct cellular effects from different wavelengths of light.

Does Infrared Light Therapy Work? The Evidence

The question “does infrared light therapy work?” is increasingly relevant as light therapy devices flood the consumer market. Infrared light — the wavelengths just beyond what our eyes can see — penetrates deeper into tissue than visible light. This has led researchers to study its potential effects on everything from wound healing to inflammation to cellular energy production.

What makes this research particularly interesting is that infrared light isn’t something we need to purchase in a device. Sunlight naturally contains the full spectrum of light wavelengths, including infrared. When you spend time outdoors, you’re receiving what Dr. Seuhelt describes as a “free infrared bath” every day. ☺️

The Winter Health Connection

The seasonal pattern of disease mortality points to something fundamental about human biology. We evolved under sunlight, and our bodies developed intricate systems that depend on regular light exposure:

• Circadian rhythm regulation — Light signals help synchronize our internal clocks, affecting sleep, hormone production, and metabolism
• Vitamin D synthesis — UVB light triggers vitamin D production in the skin, supporting immune function and bone health
• Nitric oxide release — Certain wavelengths of light cause the release of nitric oxide from the skin, which may help regulate blood pressure
• Mitochondrial function — Red and near-infrared light may directly affect cellular energy production

When winter arrives and we retreat indoors under artificial lighting, we lose access to this full spectrum of beneficial wavelengths.

Practical Steps for Better Light Exposure

Understanding whether infrared light therapy works starts with recognizing that your body already knows how to use light — it just needs access to it. Here are evidence-based approaches:

Get morning sunlight. Exposing your eyes (without sunglasses) and skin to natural light within the first hour of waking helps set your circadian rhythm for the day.

Spend time outdoors during daylight hours. Even on cloudy days, outdoor light is dramatically brighter and more spectrally complete than indoor lighting.

Consider your indoor lighting. The artificial light we spend most of our time under lacks many of the wavelengths present in natural sunlight.

Be strategic in winter. When days are short, prioritize outdoor time during peak daylight hours rather than early morning or late evening.

The Bigger Picture: Light as a Foundational Health Factor

What makes Dr. Seuhelt’s work compelling is how it reframes light exposure alongside the factors we already know are crucial — quality nutrition, adequate sleep, and regular exercise. If research continues to confirm what preliminary studies suggest, proper light exposure may deserve equal attention in any serious approach to health and longevity.

The Blue Zone connection is noteworthy here. Residents of places like Loma Linda, where Dr. Seuhelt lives, tend to spend more time outdoors and in natural light than the average American. While this is just one of many lifestyle factors that distinguish Blue Zone populations, it may be more significant than previously recognized.

As Walt Whitman wrote: “Keep your face always toward the sunshine — and shadows will fall behind you.” 🌱

Frequently Asked Questions About Infrared Light Therapy

Does infrared light therapy work for health benefits? Research suggests that infrared light can affect biological processes including cellular energy production and circulation. However, the most accessible and complete source of beneficial light wavelengths, including infrared, is natural sunlight rather than devices.

Why does mortality from diseases increase in winter? Winter brings several health challenges including more time spent indoors, reduced physical activity, and dietary changes. Research now suggests that reduced exposure to the full spectrum of natural light — including infrared wavelengths — may also play a significant role.

How much sunlight exposure do I need for health benefits? While specific recommendations vary, getting outdoor light exposure in the morning and spending time outside during daylight hours provides your body with the full spectrum of beneficial wavelengths. Even cloudy days offer significantly more light than indoor environments.

Can I get infrared light benefits without buying a device? Yes. Natural sunlight contains infrared wavelengths along with the full spectrum of light. Spending time outdoors provides what researchers describe as a natural “infrared bath” without any equipment needed.

What is the connection between Blue Zones and light exposure? Blue Zone populations like those in Loma Linda, California tend to spend more time outdoors in natural light as part of their lifestyle. While many factors contribute to their longevity, adequate light exposure may be an underappreciated element.

Does indoor lighting provide the same benefits as sunlight? No. Artificial indoor lighting lacks many wavelengths present in natural sunlight, including most of the infrared spectrum. Outdoor light is also dramatically brighter than typical indoor environments, which matters for circadian rhythm regulation.

Is light exposure really as important as diet and exercise? Emerging research suggests that proper light exposure may be a foundational health factor comparable to nutrition, sleep, and exercise. More studies are needed, but the seasonal mortality patterns and biological mechanisms identified so far point to light as a crucial and often overlooked health variable.