There is no known pornstar named 'The Substance.' Searches across web sources reveal no performer by this name or alias in the adult industry. 'The Substance' refers to a 2024 body horror film directed by Coralie Fargeat, starring Demi Moore as an aging celebrity who uses a mysterious drug to create a younger version of herself (played by Margaret Qualley).
The movie includes nudity and explores themes of ageism, fame, and self-image but is not pornography. It has been discussed in contexts involving body horror and celebrity, with occasional references to its explicit scenes in online reviews, but no connection to a specific adult film performer exists. If this refers to something else, more details would help clarify.