Exclusive: GlamGlow Is Extending Its Fan-Favorite Acne-Treating SuperMud Line

Glycolic acid is a special alpha hydroxy acid, in that most of us hear acid and think of exfoliation. But glycolic acid is also a water-binding agent, so it provides two great benefits when used. It is a well-researched acid, which is why it's found in so many products. You'll notice it works best to soften fine lines and help with hyperpigmentation caused by the sun.