WHAT IS PHA SKINCARE (POLYHYDROXY ACID), AND WHAT DOES IT DO FOR SKIN?

Like Alpha hydroxy acids (AHAs) and beta hydroxy acids (BHAs), polyhydroxy acids are chemical exfoliants that dissolve the bonds holding dead skin together. This allows the dead skin to shed more easily, revealing fresher, younger-looking skin underneath. The result? Visibly fewer dark spots, a more even and radiant complexion, and clarify the look pores.

What separates PHAs from the rest of the -HA crowd? Compared with AHAs and BHAs, these acids have larger molecules that can't penetrate as deep within skin’s surface. This makes PHAs much gentler and less likely to cause irritation — AKA a dry skin savior.

In a study from Europe PMC, PHAs were less likely to cause stinging and burning than AHAs. For those with dry skin, or sensitive complexion, PHAs are a way to get the post-facial glow of a chemical exfoliant without risking skin becoming tight or dry.

PHAs' gentle nature also make them a friendlier option for anyone who loves to soak in the sun. These acids don't create sun sensitivity, according to research from Clinical, Cosmetic and Investigational Dermatology, so you can use them during the daytime — unlike AHAs, which are best used at night. You'll still need to use broad spectrum sunscreen, of course, but you won't need to choose between skin that's soft and sun-kissed.

PHAs are versatile ingredients, and you'll get more than just exfoliation out of the mix. These gentle giants also:

• Moisturize the skin. According to the journal Cutis, PHAs are natural humectants, meaning they draw moisture into the skin to keep it plump and hydrated.

• Fight environmental damage. PHAs also work double duty as antioxidants to help fight external factors.

• Reduce the effects of excess sugars. Glycation is a process in which excess sugars bind to vital skin proteins — including ones that keep skin taut, like collagen and elastin — and cause the breakdown of these proteins. Research from the Journal of the American Academy of Dermatology suggests that PHAs help preserve skin’s natural collagen.

• Complements skin’s natural renewal process. Dead skin can appear dull and textured. PHAs help to exfoliate dead skin in a gentle manner. Complementing this natural skin process helps support smooth, soft, even-toned skin.

• Remove pore-clogging debris. PHAs are a gentle way to do what many acids are famous for: sweep away pore-clogging dead skin and dissolve surface grime. Shaking off that extra layer helps clarify the look of pores.