"Kryptonite" is the debut single of American rock band 3 Doors Down. It was originally released as a demo for local play by 97.9 WCPR-FM in Biloxi, Mississippi, then was picked up by several radio stations during November and December 1999 and was officially serviced to radio on January 18, 2000. The song first charted on the US Billboard Mainstream Rock Tracks chart, reaching number one for nine weeks, then topped the Billboard Modern Rock Tracks chart for 11 weeks; it was 2000's most successful song for both rankings. It also reached number three on the Billboard Hot 100, the band's highest-charting single on the listing.