Cancer-Haunted Olivia Downs Witch Doc's Brew!

Desperate star turns to jungle potion in bid for cure

- 

Grease star Olivia Newton-John is so desperate in her last-ditch battle against incurable stage IV cancer she’s knocking back a bizarre LSDlike potion concocted by a witch doctor in the Amazon jungle!

And now, the magic brew she’s used at the urging of vitamin-mogul hubby John Easterling has left her convinced she will beat the deadly disease, say sources!

After the 71-year-old Physical singer downed “a little cupful” of the plant-based hallucinogen ayahuasca, she was hit with “room-spinning” delusions and nausea.