This article is a part of CNN Underscored’s Guide to Age-Defying Beauty, a weeklong focus on the essential products, tips and tricks to enhance your glow at any age. We’ll be featuring editor-tested ...

We developed a hybrid copper–iodide compound called CuI(Hda). It emits deep-blue light at about 449 nanometres and has an almost-perfect photoluminescence quantum yield — a measure of emission ...

Before we get into which products you should buy, there is much to learn about LED. When I first heard about light therapy as skincare, I thought it might be a fad. But forms of light therapy, also ...

Courtesy of Celluma. Image treatment by Ashley Peña. We may receive a portion of sales if you purchase a product through a link in this article. Over the past couple of years, we’ve witnessed a surge ...

Light-based therapies have become increasingly popular, and for good reason. Aesthetician Kristyn Smith loves LED face masks to help her clients maintain results after her treatments. “Ultimately, a ...

If you’ve spent even five minutes on the beauty side of TikTok, you’ve undoubtedly come across an influencer wearing a Darth Vader–style mask with light emanating from its perimeters or waving a ...

LED therapy masks use specific light wavelengths for at-home skincare treatments. Red light is used to improve fine lines, while blue light targets acne-causing bacteria. Users should follow safety ...