"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[2][3] and was officially serviced to radio on January 18, 2000. The song first charted on the US Mainstream Rock Tracks chart, reaching number one for nine weeks, then hit number one on the Modern Rock Tracks chart for 11 weeks. It also reached number one on the Mainstream Top 40 chart for five non-consecutive weeks, number four on the Adult Top 40 chart, and number three on the Billboard Hot 100, the band's highest-charting single on the listing.