Lactic acid is a natural byproduct of the body. It is integral to good health and does not result from exercise or cause soreness. Learn more here.

Lactic acid has long been villainized, but new research shows it doesn't impair muscle function. In fact, it might actually be good for you.

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.

In a quirk that borders on supernatural, Phelps apparently produces just half the lactic acid of a typical athlete — and since lactic acid causes fatigue, he’s simply better equipped at a ...

People often discuss the importance of removing, or “flushing out,” lactic acid from the blood after intense exercise to reduce muscle soreness, speed recovery, or boost athletic performance.