Lactic acid is an alpha hydroxy acid mostly derived from milk, but it can also be extracted from vegan sources like corn starch and other sugar-rich foods. However, most skincare products use ...

When I first heard about using lactic acid for skin, I had a moment of confusion—isn't that what builds up in your muscles during a workout and causes soreness later? Turns out: more or less, yes! I ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." We're here to tell you that lactic acid doesn't just cause sore muscles. In the skincare world, salicylic ...