Margaret Qualley says it took "a year" to heal from damage caused by The Substance prosthetics
In The Substance, Hollywood star Elisabeth Sparkle (Demi Moore) is fired from her aerobics show when she turns 50. This leads her to seek out a drug called The Substance. After taking the drug, Elisabeth births a younger version of herself who she shares a consciousness with - the catch is she has to alternate living as each every seven days.