And that's why the somewhat under-the-radar acid that's trending right now is the gentle giant known as polyhydroxy acid (PHA). PHAs are dubbed "the chill distant cousin" to AHAs, and they're ...

and they are basically polyhydroxy aldehydes, polyhydroxy ketones or compounds that can be hydrolysed to them. These carbohydrates are the ultimate source of most of our food because we eat grain ...

For this piece, she consulted dermatologists to learn more about polyhydroxy acids and their benefits in skin care.