Red Light Therapy: Understanding the Potential Benefits of Red and Near-Infrared Light

10 Jul, 2026

From professional athletes and skincare clinics to biohacking enthusiasts, many people are exploring how specific wavelengths of light may support health and recovery.

Unlike ultraviolet (UV) light from the sun, red light therapy uses low levels of red and near-infrared light that do not generate heat in the same way.

While research is expanding, scientists are still investigating which benefits are well established and which require further evidence.

What Is Red Light Therapy?

Red light therapy (RLT), also known as photobiomodulation, involves exposing the body to specific wavelengths of red and near-infrared light.

These wavelengths are believed to penetrate the skin and interact with cells, particularly the mitochondria, which are responsible for producing cellular energy.

Researchers are studying whether this process may help support normal cellular function and tissue repair.

How Does It Work?

Our cells use energy to repair, grow, and perform everyday functions.

Some laboratory and clinical studies suggest that certain wavelengths of red light may influence how cells produce energy and respond to stress.

However, the exact biological mechanisms are still being studied, and not all proposed effects have been confirmed.

Potential Benefits

Research into red light therapy continues to grow.

Some areas with promising evidence include:

1. Skin Health

Several studies suggest that red light therapy may help improve the appearance of skin by supporting normal collagen production and reducing visible signs of aging.

It has also been studied for improving overall skin texture.

2. Muscle Recovery

Some athletes use red light therapy as part of their recovery routine.

Research suggests it may help reduce post-exercise muscle soreness and support recovery in certain situations.

Results, however, can vary between individuals.

3. Joint Comfort

Some studies indicate that red light therapy may temporarily help reduce discomfort and stiffness associated with certain musculoskeletal conditions.

It is generally considered a complementary approach rather than a replacement for medical treatment.

4. Wound Healing

Researchers are investigating whether red light may support normal tissue repair and wound healing.

Some evidence is encouraging, but more large-scale studies are needed.

5. Hair Growth

Certain FDA-cleared low-level light devices are used to help treat specific types of hair loss.

Evidence suggests that some people may experience improved hair growth when these devices are used as directed.

What the Research Still Doesn't Know

Although many findings are promising, red light therapy is not a miracle treatment.

Researchers are still working to determine:

The most effective wavelengths
Ideal treatment duration
Long-term safety for different uses
Which conditions respond best

Much of the research is ongoing, and results are not always consistent across studies.

Is Red Light Therapy Safe?

When used according to manufacturer instructions, red light therapy is generally considered safe for most healthy adults.

However:

Avoid looking directly into bright light sources unless appropriate eye protection is recommended.
Follow the instructions provided with the device.
People with certain medical conditions or those taking medications that increase light sensitivity should consult a healthcare professional before use.