"I've tried a lot of things, but aside from sports and good nutrition, most things don't make a difference," Kidman, 43, tells the German magazine TV Movie. "I have also tried Botox."
But Kidman, who's nominated for a Golden Globe for her highly emotional portrayal of a grieving woman in Rabbit Hole, says she didn't like using the injections, which are known to tighten up a patient's face to avoid the appearance of wrinkles.
"I didn't like how my face looked afterwards," she says. "Now I don't use it anymore – I can move my forehead again!"
Reporting by KAREN NICKEL ANHALT