"Stronger (What Doesn't Kill You)" is a song by American recording artist Kelly Clarkson and the title song from her fifth studio album, Stronger (2011). Originally titled as "What Doesn't Kill You (Stronger)", the song served as the album's second single on January 17, 2012, through RCA Records. Written by Jörgen Elofsson, Ali Tamposi, and David Gamson, with additional writing and production by Greg Kurstin, "Stronger (What Doesn't Kill You)" is an uptempo song which draws from the genres of dance-pop and electropop. Its lyrical content mainly explores themes of empowerment and recovery following a heartbreak, with the chorus inspired by a Friedrich Nietzsche quotation: "That which does not kill us makes us stronger."