Red light saunas use infrared light wavelengths to warm your body from the inside, rather than heating the air around you like a traditional sauna

A red light sauna combines two separate things: infrared heat (which you encounter from heat therapy) and red light wavelengths (typically between 600 and 700 nanometers). The sauna cabinet or chamber contains bulbs or panels that emit both at the same time. When you sit inside, the infrared heat warms your core temperature, while the red light wavelengths penetrate your skin. People use red light saunas hoping to address skin appearance, muscle recovery, circulation, and inflammation—though the research on each claim varies in strength.

The main difference from a traditional sauna is that red light saunas don't heat the air itself. Instead, the light energy travels directly to your skin and tissues. This means the room stays cooler (usually between 120°F and 150°F, compared to 160°F to 200°F in a traditional sauna), and you may feel less of the intense, suffocating heat that some people find uncomfortable. Some people tolerate red light saunas better for that reason, though others prefer the deeper sweat of a hotter environment.

Key Takeaways

  • Red light saunas combine infrared heat with red light wavelengths, warming your body directly rather than heating the surrounding air.
  • People use them with the goal of improving skin texture, reducing muscle soreness, increasing blood flow, and lowering inflammation, though evidence is stronger for some uses than others.
  • Sessions typically last 20 to 40 minutes, and most people start with two to three times per week.
  • Red light saunas are generally considered safe for most people, but you should avoid them if you are pregnant, have certain skin conditions, or take medications that increase light sensitivity.

What the research shows about red light and skin

Red light wavelengths have been studied most thoroughly for skin health. The theory is that red light stimulates collagen production and increases blood flow to the skin, which may reduce the appearance of fine lines, improve skin texture, and support healing. Several small studies have found that red light therapy (delivered through panels or devices, not necessarily in a sauna) can increase collagen and improve skin elasticity in people with sun damage or aging skin.

However, most of these studies involved targeted red light therapy on the face, not full-body exposure in a sauna. The research on red light saunas specifically—where you are exposed to both heat and light for 20 to 40 minutes—is much thinner. Heat alone can improve blood flow to the skin, so it is difficult to separate what benefit comes from the red light versus what comes from the warmth. If skin improvement is your main goal, dermatologists more often recommend targeted red light devices used at home, where you control the dose and wavelength more precisely.

How red light saunas may affect muscle recovery and soreness

Athletes and people who exercise regularly use red light saunas hoping to reduce muscle soreness and speed recovery. The proposed mechanism is that red light increases blood flow and reduces inflammation in muscle tissue. Some research on red light therapy shows it may lower markers of inflammation and reduce delayed-onset muscle soreness (DOMS) when used within a few hours after exercise.

Again, the research is stronger for targeted red light therapy than for full-body sauna exposure. A few small studies suggest that infrared saunas (with or without red light) may reduce muscle soreness when used regularly, but the effect sizes are modest. If you use a red light sauna for recovery, consistency matters more than a single session—most people in studies used them three to five times per week. It is also worth noting that heat alone, without red light, appears to offer similar benefits for muscle soreness, so the added cost of red light may not be necessary for this goal.

Circulation and inflammation: what we know and what remains unclear

Red light saunas are marketed for improving blood flow and reducing systemic inflammation. Heat therapy in general does increase circulation temporarily—your blood vessels dilate to help cool your body—and some research suggests regular sauna use may have lasting benefits for cardiovascular health. Red light is theorized to enhance this effect by stimulating mitochondria (the energy centers in your cells) and reducing oxidative stress.

The challenge is that most studies on red light and inflammation have been done in laboratory settings or on isolated tissues, not in whole humans using a sauna. The few human studies that exist are small and often funded by sauna manufacturers. What we can say with confidence is that heat itself improves circulation during and shortly after use. Whether red light adds a meaningful benefit on top of that is still an open question. If your goal is cardiovascular health or reducing inflammation, regular heat therapy (sauna, hot bath, or exercise) has stronger evidence than red light specifically.

How often people use red light saunas and what a typical session looks like

Most people start with sessions of 20 to 40 minutes, two to three times per week. Some people work up to daily use, while others find that once or twice weekly is enough. There is no official standard—frequency depends on your tolerance, your goals, and what feels sustainable for you. Many facilities that offer red light saunas recommend starting conservatively (20 minutes, twice weekly) and adjusting based on how you feel.

A typical session involves sitting or lying in a sauna cabinet or chamber while the infrared heat and red light wavelengths surround you. You may sweat, though less intensely than in a traditional sauna. Some people bring water to drink, and many facilities recommend showering afterward to rinse off sweat. If you are using a red light sauna at home (smaller devices do exist), sessions are usually shorter, around 10 to 20 minutes, because the light is more concentrated.

Who should avoid red light saunas

Red light saunas are generally safe for most healthy adults, but certain groups should check with a doctor first. Pregnant people should avoid saunas of any kind, as elevated core body temperature in early pregnancy has been linked to birth defects in some studies. People with uncontrolled high blood pressure, heart disease, or a history of fainting should talk to their doctor before using any sauna, because the heat stress can affect your cardiovascular system.

If you have a skin condition like rosacea, eczema, or photosensitivity (sensitivity to light), red light saunas may irritate your skin or trigger a flare. Certain medications—including some antibiotics, anti-inflammatory drugs, and supplements like St. John's Wort—can increase your sensitivity to light. If you take any medication regularly, ask your doctor or pharmacist whether it interacts with light therapy. People with a history of skin cancer or suspicious moles should also consult a dermatologist before regular red light exposure.

Red light saunas versus other heat therapy options

If you are interested in heat therapy but unsure whether a red light sauna is right for you, here is how it compares to other common options. A traditional sauna heats the air to a very high temperature, produces intense sweating, and has the longest research history for cardiovascular and muscle benefits. An infrared sauna (without red light) warms your body directly like a red light sauna but costs less and requires no light component. A hot bath or steam room is accessible at home and requires no equipment, though the benefits are similar to sauna use. Red light therapy panels (used outside a sauna) let you target specific areas and control the dose, but they do not provide the full-body heat benefit.

The choice depends on your access, budget, and what you are hoping to achieve. If skin health is your primary goal, a targeted red light device may be more effective than a sauna. If you want cardiovascular benefits or muscle recovery, traditional heat therapy (sauna or hot bath) has stronger evidence. If you enjoy the sauna experience and want to explore red light as an addition, a red light sauna is a reasonable option—just go in knowing that the red light component is still being studied, and heat alone may account for most of the benefit.

Frequently Asked Questions

Is a red light sauna safe to use every day?

Daily use is generally considered safe for most people, though most research has looked at two to five times per week. If you are new to saunas, start with two to three times weekly and see how your body responds. If you have any health conditions, check with your doctor first, especially if you take medications or have heat sensitivity.

Can I use a red light sauna if I have tattoos?

Red light and heat can fade tattoos over time, particularly newer ones. If you have fresh tattoos (less than two weeks old), it is best to wait until they are fully healed. For older tattoos, occasional sauna use is unlikely to cause visible fading, but regular use may speed up the process. If your tattoos are important to you, ask the sauna facility or your tattoo artist about frequency.

Do red light saunas help with weight loss?

Red light saunas do not burn significant calories or cause lasting weight loss. You may lose water weight during a session, which returns when you rehydrate. Some research suggests that regular sauna use may have small effects on metabolism or body composition over months, but the evidence is weak and the effect is modest. Saunas are better thought of as a recovery or relaxation tool than a weight loss method.

How is a red light sauna different from a red light therapy panel?

A red light therapy panel is a handheld or wall-mounted device that emits red light only, without heat. You use it for shorter periods (5 to 20 minutes) and can target specific areas like your face or joints. A red light sauna combines red light with infrared heat and involves your whole body for longer sessions. Panels are cheaper and more portable; saunas offer the added benefit of heat therapy but require a facility or larger home investment.

What should I do if I feel dizzy or uncomfortable in a red light sauna?

Exit the sauna when ready and cool down in a comfortable space. Drink water and rest for several minutes. Dizziness can happen if you overheat, become dehydrated, or have low blood pressure. Start with shorter sessions (15 to 20 minutes) and make sure you are well-hydrated before entering. If dizziness happens repeatedly, talk to your doctor before using a sauna again.