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

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.