As a beauty writer, I get asked lots questions by friends, and one of the most common is, Do red light masks work? I get it—these buzzy beauty gadgets are intriguing. And there are several red-light therapy devices and LED masks on the market, such as the Omnilux Contour or Dr. Dennis Gross DRx SpectraLite FaceWare Pro. But they don’t come cheap—not to mention, one of these at-home masks is yet another relatively time-consuming thing to add to your skin care routine.

You’ve probably seen the robot-like at-home devices on social media being touted as antiaging miracle workers for all skin types. Some are made of flexible silicone, others of more structured plastic. Both types of red-light masks are skin care devices built with LEDs (light-emitting diodes) that emit specific wavelengths of light, typically between 620 and 750 nanometers for red light and 760 to 1,400 nanometers for near-infrared light to stimulate cellular activity. Purported benefits include everything from overall skin tone and texture improvements to specific concerns like wrinkles, hyperpigmentation, acne, and even wound healing.

The catch? The vast majority of these LED devices cost at least a few hundred dollars—some as much as $1,000 or more.

Do at-home red-light masks actually work?

Though it recently garnered the attention of the masses, LED light therapy, sometimes referred to as RLT or low-energy red/near-infrared light, has been used for decades. In fact, NASA used red light to boost plant growth in space in the 1990s, and the scientists working with the lights found that abrasions on their hands seemed to heal faster, leading to additional NASA-funded studies on the medical benefits of light therapy.

Years later, there’s much more clinical trial evidence to support red light’s safety and efficacy in skin rejuvenation, says Shoshana Marmon, MD, PhD, FAAD, assistant professor of Dermatology at New York Medical College. It has been studied extensively for its anti-inflammatory properties and ability to treat many skin conditions, including pre-cancer and chronic photodamage. It’s also been shown to boost collagen and elastin production.

What are the primary benefits of red-light masks?

Decelerated skin aging

The anti-inflammatory properties of red light are particularly important, because it’s a main cause of all skin aging, says Corey L. Hartman, MD, a board-certified dermatologist and founder of Skin Wellness Dermatology in Birmingham, Alabama. A split-face, randomized clinical trial found a 30% reduction in periocular wrinkles (commonly known as crow’s feet) but no improvement in skin hydration and elasticity. In another study, researchers found evidence that red-light therapy also stimulates collagen production, which reduces fine lines and wrinkles.

Improved acne

In an article published in the Journal of the American Medical Association, data showed improvement in acne bumps after 12 weeks of red-light therapy. Some red-light therapy masks are also equipped with other types of LED lights, the most popular of which is blue-light therapy (typically around 405 to 420 nanometers)—a light therapy that has significant data supporting its efficacy in treating inflammatory acne breakouts.

Reduced rosacea and eczema

“By reducing inflammation, red-light therapy can help to reduce the redness associated with rosacea,” says Roger Kapoor, MD, a board-certified dermatologist and senior VP at Beloit Memorial Hospital in Wisconsin. It’s these same anti-inflammatory benefits that may also help with other skin conditions, including eczema, says Dr. Hartman.

Faster wound healing

In one study, red-light therapy activated cell regeneration in a wound-healing laboratory model, suggesting it could help accelerate tissue repair and wound healing, says Dr. Kapoor.

Diminished hyperpigmentation

“Since red-light therapy reduces inflammation, it may help reduce hyperpigmentation associated with acne by stimulating cellular turnover that can help fade dark spots over time,” says Dr. Kapoor, noting that data is limited on red-light therapy and its impact on hyperpigmentation; the treatment is still a subject of ongoing research.