Made from the bacterial fermentation of sugar, lactic acid appears as an additive in vegan foods ranging from sourdough bread to soy sauce. This bacteria gives food its signature sour taste and acts ...

Putting acid on your face might sound like a recipe for disastrous stinging, burning, and peeling—a la Samantha’s lobster-red face in that unforgettable episode of Sex and the City. Lactic acid for ...