Shailene Woodley detoxes by eating clay.
The 'Divergent' actress maintains a strictly organic beauty regime and picked up one of her most unusual habits from a taxi driver, who advised her to ingest a supplement of bentonite clay to clean the heavy metals out of her system.
She explained in an interview with IntoTheGloss.com: "He was African and was saying that, where he's from, the women eat clay when they're pregnant ... So, 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.
"And, this is crazy: it also helps clean heavy metals out of your body. My friend starting eating it and the next day she called me and said, 'Dude, my s**t smells like metal.' She was really worried, but we did some research together and everything said that when you first start eating clay, your bowel movements, pee, and even you, yourself, will smell like metal."
The eco-friendly actress has found natural remedies for every Hollywood beauty trick, namely rinsing her mouth out with sesame oil instead of getting her teeth whitened.
Shailene added: "I love a natural way to heal. You can do something called 'oil pulling' where you swish coconut or sesame oil in your mouth when you wake up and spit it out.
"It's amazing! It really makes your teeth whiter, because the plaque on your teeth is not water soluble, it's fat-soluble."
The 22-year old star also made the surprising confession that she only washes her short hair once a month.
She joked: "I only shampoo it like once a month - the oilier, the better."

Chris Brown won't be allowed to shower every day in jail.
The R&B singer was sentenced to stay behind bars in a Los Angeles correctional facility for another month on Monday (17.03.14) after getting thrown out of a rehab facility in Malibu, and it has now emerged he will reportedly only be able to wash once every two days.
Chris - whose legal troubles stem from violating his probation in the infamous Rihanna assault case - will be placed in solitary confinement 23 hours a day, according to TMZ, so won't have to worry about his personal hygiene bothering a cellmate.
However, the site reports that the suave singer will still be able to read library books and workout from the confines of his cell, where he is expected to remain until his probation violation hearing on April 23.
Chris, 24, was transferred to the correctional facility after a court hearing yesterday during which judge James Brandlin revealed Chris had been kicked out of rehab after "rubbing elbows" with a female, refusing to take a drug test and making a threat during group therapy, reportedly saying, "I am good at using guns and knives."
Being chucked out of the court-ordered anger management programme - which was extended from an initial three month period - was considered to be a violation of his probation.
The 'Don't Wake Me Up' singer also faces a separate charge of misdemeanour assault in Washington D.C., which will be heard on April 17.

Sofia Coppola will direct a live-action version of 'The Little Mermaid'.
The filmmaker has reportedly set her sights on Hans Christian Andersen's tragic fairy tale as her next project after 2013's 'The Bling Ring', and is in negotiations to bring the classic children's story to life on the big screen, Deadline.com is reporting.
Fans shouldn't expect a repeat of Disney's bubblegum 1989 cartoon version about aquatic princess Ariel and talking crab Sebastian, however.
Coppola is thought to be planning a version in keeping with the original 1837 story, which sees the broken-hearted Little Mermaid commit suicide after the Prince marries another woman.
The new Universal Pictures/Working Title production is said to be based on a script by Caroline Thompson ('Edward Scissorhands'), which was originally drafted by Kelly Marcel ('Saving Mr. Banks') and Abi Morgan ('Shame').
Coppola is taking over from 'Atonement' helmer Joe Wright, who was originally on board to direct, and intends to "move quickly" with the project.
The director has young daughters Romy and Cosima with her husband, Phoenix frontman Thomas Mars, and is said to want to make a movie which her children can appreciate.

WWE Superstar Fandango admits it was a "cool" moment when his childhood idol Hulk Hogan told him he was a fan of his.
The 32-year-old grappler recently got the opportunity to meet the legendary star now he has returned to the company to be the host of 'WrestleMania XXX' - which can be watched from 1.00am on April 6 via Sky Box Office - and Fandango was stunned when Hulk approached him and WWE Diva Summer Rae to praise their in-ring work.
Recalling the impromptu meeting, Fandango told BANG Showbiz: "Hulk came up to Summer and me and said he was a big fan of ours. It was cool to get a compliment like that, from someone who you looked up to growing up."
Fandango - who uses ballroom dance moves in the ring and is always accompanied by his 'dancing partner' Summer - didn't get much time to chat to the WWE Hall of Famer but is hoping to get a chance to ask the 60-year-old star for some advice in the near future.
He added: "It was just a quick interaction and then he was gone. Hopefully we'll get to spend a little bit more time together and talk."
As well as preparing for 'WrestleMania XXX', the WWE has just announced it is launching its first animated series for almost 30 years.
The sports entertainment company has produced 'WWESlam City', a 26-episode stop-motion series, in conjunction with toy manufacturers Mattel which launched on Monday (17.03.14).
The series is comprised of two minute shorts each featuring a different WWE Superstar who after being fired from the WWE by new character The Finisher has to go to Slam City to find a job.
Superstars to feature in the series include John Cena, The Big Show, Randy Orton, Sheamus and Rey Mysterio and viewers will see them become zookeepers, car mechanics and theatre ushers among other jobs.
Casey Collins, WWE's Executive Vice President for Consumer Products, said: "WWE Superstars are big kids whenever they see themselves represented in a video game or as an action figure, so they have been blown away by what we've done here, outside of the ring." The first four episodes can be viewed at WWESlamCity.com and Cartoonium on YouTube and the show can be viewed on other online formats such as via Xbox and Playstation in the UK, US and Canada.

E4 has commissioned a 'Made in Chelsea' spin-off set in New York.
The cast of the hit reality show will travel to the Big Apple this summer for a brand new standalone series, 'Made in Chelsea: New York', which will air across six episodes in August.
Sarah Dillistone of Monkey Productions said: "We're very excited about the world of 'Made in Chelsea' travelling America. New York has a scene buzzing and sophisticated enough to rival Chelsea, so it feels like the next natural step. We're going to see the cast out of their bubble for the first time since the show began and I'm sure the result will be nothing like we've seen before."
It's not yet known which cast members will jet to New York, but Louise Thompson says the London socialites are "over-excited" at the thought of filming in America.
She told Digital Spy: "[The producers] have got lots of options. We're all getting really, really over-excited about it, but nothing has been confirmed yet.
"It's basically going to be as dramatic and as cool as filming here, but in an equally cool city - if not more exciting."
In addition to the New York-based series, the cast - which includes lothario Spencer Matthews and Jamie Laing - will return to screens in April for the BAFTA-winning show's seventh series.
'Chelsea' addicts will be able to watch the show on Mondays at 10pm on E4, but for the first time viewers can catch an exclusive first look at each episode 48 hours before it airs through Channel 4's online streaming service, 4OD.

Donnie Wahlberg is "paranoid" about Jenny McCarthy's renewed friendship with her ex-boyfriend Jim Carrey.
'The View' presenter - who dated Jim, 52 from 2005 to 2010 - reportedly infuriated her current partner when she revealed she was back in touch with the 'Dumb and Dumber' star during an episode of the US TV show.
Jenny, 41, told her fans and co-hosts recently: "Jim and I have become friends now since our break-up."
'Blue Bloods' star Donnie - who has been dating the former Playboy model since July - is said to have been left feeling concerned by her revelation and is becoming increasingly "paranoid" that Jim is trying to win Jenny back.
A source told RadarOnline.com:"Jenny and Jim are always on the phone talking and it's starting to bug Donnie. Jenny pretty much dismisses his irritation, but it's putting things on dangerous ground.
"He knows Jim has a hold over her and he's not happy about this renewed contact. Donnie is very paranoid about Jim trying to win her back and is under no illusion that he has the charms to do it."

Ashton Kutcher sought Mila Kunis' father's permission to marry her.
The 'Anger Management' actor - who was previously wed to Demi Moore - wanted to do things in a "traditional" way so sought the blessing of his actress girlfriend's dad Mark over the Christmas period ahead of popping the question earlier this year.
A source said: "He talked with Mila's dad around Christmastime.
"He asked for Mark's blessing to marry her. It was important to Ashton to be respectful and traditional. This is the real thing for him and he wants to do it all right."
The former 'That 70s Show' co-stars have been together since April 2012 and friends don't think they will have a long engagement, predicting they will tie the knot later this year.
One friend told People magazine: "They don't want to wait.
"This relationship started on solid ground and everything is working out. They are in it for the long haul, truly."
Friends previously said Ashton, 36, and his 30-year-old girlfriend are so well suited and content together, it is like they are married already.
One insider said last September: "They are clearly very much in love, in tune with each other and so comfortable.
"In some ways, it's like they're married already."

Michael Douglas' son has been released from solitary confinement.
Cameron Douglas had spent almost two years incarcerated alone without visitors at Cumberland Federal Corrections Institute in Maryland after breaching his original sentence for drug dealing, but it has now emerged the tough punishment was relaxed "some time ago".
Anthony Papa of the Drug Policy Alliance told RadarOnline.com: "It's true. That's what I heard.
"It actually happened a little while back. I'm not sure of the exact date."
However, it is unclear yet whether Michael and his ex-wife, Cameron's mother Diandra Lucker, will be able to see their son yet.
Anthony added: "I'm not sure if they will be allowed to visit, but Cameron is out of solitary."
Michael - who is married to Catherine Zeta Jones, the mother of his children Dylan, 13, and 10-year-old Carys - drew attention to Cameron's situation at the Emmy Awards last year as he accepted a prize for his role in 'Behind the Candelabra'.
He said in his speech: "I'm questioning the system. At first I was certainly disappointed with my son, but I've reached a point now where I'm disappointed with the system.
"If you happen to have a slip, they punish you. In my son's case, he has spent almost two years in solitary confinement."
Cameron was handed a five-year sentence for heroin possession and conspiracy to distribute narcotics in 2009, which was extended by four and a half years in 2011 after he committed drug infractions behind bars, meaning he is due to be released in 2018.

Michael Buble was afraid of getting married.
The 38-year-old singer - who has five-month-old son Noah with spouse Luisana Lopilato - always knew he wanted to spend the rest of his life with the 26-year-old beauty but admits before they tied the knot in 2011, he was terrified of making a permanent commitment.
Speaking on 'George Stroumboulopoulos Tonight', he said: "It's funny ... I've said it before and I get in trouble for it, I fell in love with my wife. She's a great person. And it's weird, I wanted to get married to her because I wanted to be with her for my life. She's my best friend. But did I want to get married? It's a scary commitment. I gotta be honest, by the time I hit my 30s marriage was out. I just looked at my friends who got married and went, 'Why?' Especially friends who got married and didn't have kids. Then I was really stumped.
"I was, like, 'So what's your reason for being married if you're not going to have kids? Why are you doing it?'
"It's just one of those things, you know. I couldn't have known it was going to be as good as it is."
The 'Haven't Met You Yet' hitmaker also thought he was too "selfish" to be a father and is still filled with concerns about being a good parent.
He said: "Even having a kid, I thought I was way too selfish, impatient and I thought I was scared every day, even when she was pregnant, I was like, 'Am I good enough? Am I going to be a good dad? Am I going to be an absentee father?'
"It's a tough conversation. It's something we struggle with daily."
Michael and George met up for a special on-location interview in Ucluelet, B.C.'s Pacific Rim National Park.

Cameron Diaz believes everyone will be cheated on at some stage in their life.
The 41-year-old actress - who has previously dated stars including Jared Leto and Justin Timberlake - thinks infidelity in a relationship is inevitable, and though she insists she doesn't "judge" those who cheat, she also thinks people should always learn from their experiences.
Asked about her new movie 'The Other Woman' - in which her character discovers her boyfriend is married to someone else - she said: "I didn't make that movie to make a statement. My statement is that I am actually not interested in making movies about men cheating on women, it's not what I'm interested in.
"Everybody has been cheated on, everyone will be cheated on. I can't fix that, I don't know how, I don't have any judgement on anybody, I don't know how to fix the problem.
"We are human beings, we are complicated - you cannot go through life without tallying up a few scars, you cannot go through life unscathed, it's just what it is. It's all meant to happen, take your lessons, figure it out, move on."
Cameron also admitted she had "gone down the wrong roads" in the past, but has learned from her mistakes just like everyone else.
She told the new UK issue of OK! magazine: "I am human and I have gone down the wrong roads, and I have taken some pretty good roads and I have taken the high and taken the low.
"It's life, that's what life is all about, learning your lessons."

Sir Mick Jagger has paid tribute to his "lover and best friend" L'Wren Scott.
The Rolling Stones frontman admitted he is "struggling to understand" the tragic news that the fashion designer - who he was in a relationship with for 13 years - took her own life yesterday (17.03.14), and recalled their "wonderful" time together.
In a statement on his website entitled 'L'Wren', he wrote: "I am still struggling to understand how my lover and best friend could end her life in this tragic way.
"We spent many wonderful years together and had made a great life for ourselves.
"She had great presence and her talent was much admired, not least by me."
The 70-year-old rocker - who has seven children with four women - went on to say he felt "touched" by the tributes which have poured in for the 49-year-old stylist and pledged to "never forget" her.
He finished: "I have been touched by the tributes that people have paid to her, and also the personal messages of support that I have received.
"I will never forget her, Mick"
The 'Brown Sugar' hitmaker was in Australia for the Rolling Stones' tour when the news was broken to him.
The first gig in the country, which was due to take place tomorrow (19.03.14) in Perth, has been cancelled.

Queen Elizabeth's former gynaecologist has been knighted by Prince William.
Sir Marcus Setchell, who delivered William and Duchess Catherine's first child Prince George last July, was made a Knight Commander of the Royal Victorian Order by the tot's father today (18.03.14).
Marcus was knighted for his services to the royal family over the years in a ceremony that took place at Buckingham Palace in London.
The queen's gynaecologist had attended to the 87-year-old monarch for 24 years and delivered numerous royal babies before retiring from the medical profession at the end of last year.
After being knighted, Marcus described delivering young Prince George as a "lovely experience" and said overseeing the team who helped deliver the royal baby was a wonderful way to end his career.
Sir Marcus is quoted by the Daily Telegraph newspaper as saying: "It's a great honour and it's very nice that I was able to serve her for 24 years and that the culmination of it was that Prince George should be born.
"Being a gynaecologist and obstetrician must be one of the nicest jobs in the world.
"I think even after doing this job for 40 years every birth is exciting, moving and lovely."
Quizzed about his conversation with William, Marcus says he was given an update on Prince George.
He said: "He did make some remarks about what a bouncing baby George is now."