Lactic acid is an over-the-counter chemical exfoliant that comes from the fermentation of lactose — a carbohydrate found in milk. It's a popular ingredient in numerous skin care products nowadays. But ...

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 ...

Bacteria, including some bacteria in a person’s gut, make lactic acid during fermentation. Manufacturers add lactic acid to food to extend its shelf life, although in some foods, it occurs naturally.

What is lactic acid? If you’ve ever tried to sprint as fast as you can at the end of a race or bang out a set of heavy squats in the gym, you’ve probably experienced an uncomfortable burning sensation ...