"What Doesn't Kill You (Stronger)", also known as "Stronger (What Doesn't Kill You)" when released as a single, is a song by American pop rock singer Kelly Clarkson. It is the second track from her fifth studio album, . It was written by Jörgen Elofsson, Ali Tamposi, David Gamson, Greg Kurstin and produced by Kurstin. The song's lyrics mainly explores the themes of empowerment. It was released as the second single from her fifth studio album, . 　　The song received generally positive reviews from music critics, who praised Clarkson's vocal performance, some of whom highlighted it as one of the album's musical highlights. Immediately following the release of , the song entered the Billboard Hot 100 at number 64. Before singing the song live at The Borderline in London, Clarkson announced that "What Doesn't Kill You (Stronger)" would be released as her next single and that the video for it would have worldwide fan involvement. The song is currently being used in a Toyota commercial which features Clarkson singing the song.