The actress is known for her all-natural stance, even when it comes to beauty products. One of Shailene Woodley's favorite beauty routines? Using clay toothpaste as well as ingesting clay. "I've discovered that clay is great for you because your body doesn’t absorb it, and it apparently provides a negative charge, so it bonds to negative isotopes," she said in an interview with Into the Gloss. "And, this is crazy: it also helps clean heavy metals out of your body."