The Substance is a 2024 body horror film written and directed by Coralie Fargeat, the French filmmaker whose debut feature Revenge established her as one of the most formally radical voices in contemporary genre cinema. The film is a visceral, unflinching provocation about the entertainment industry's treatment of aging women, told through the vehicle of science fiction body horror and delivered with the maximalist visual confidence of a filmmaker who treats disgust and beauty as equally legitimate artistic instruments.

The film stars Demi Moore as Elisabeth Sparkle, an aging Hollywood celebrity and aerobics television host who, upon learning she is being replaced by a younger talent, injects a mysterious medical substance that generates a second, younger version of herself — played by Margaret Qualley. The two versions must share their single body on a strict alternating schedule, but as Elisabeth's envy and the younger self's ambitions escalate past the boundaries of the agreement, their shared existence begins to deteriorate in increasingly grotesque and operatic ways. The film uses its horror mechanics as a relentless formal metaphor for the way women are conditioned to consume themselves in the pursuit of an impossible standard of desirability.

The Substance premiered at the 2024 Cannes Film Festival, where Fargeat won the Prix du Scénario for Best Screenplay. The film subsequently won the Academy Award for Best Makeup and Hairstyling at the 2025 Oscars, and Demi Moore won the Golden Globe for Best Actress in a Motion Picture Drama — her first major acting award after a career spanning decades. The film divided critics and audiences with its commitment to escalating excess, but united them in acknowledging it as an uncompromising vision that demanded to be reckoned with.