Gwyneth Paltrow has had us eating chia seeds, forking out for Tracey Anderson's fitness DVD and juicing every vegetable that crosses our path.
However, we're not entirely sure we can get on board with the her latest fad.
The Hollywood lifestyle guru has joined the 'no poo' movement.
This involves usually pristine celebrities shunning shampoo from their haircare regime in a bid to restore hair health.
According to the Environmental Working group, Gwyneth is worried about using shampoos that contain Sodium Lauryl Sulphate, as it can cause skin irritation, organ toxicity and even cancers.
But Gwyneth isn't shying away from the limelight, despite sporting an unwashed mane.
In fact, the 41-year-old has been spotted embracing the natural tresses trend without looking bedraggled, due to one key ingredient in her superstar diet - vitamin C.
In addition to the shampoo strike, taking dietary vitamin C supplements aids Gwyneth's hair cleanliness.
Vitamin C is said to help the production of sebum, a scalp oil that works as a natural hair conditioner, leaving the hair fresh and visibly clean while preventing her locks from becoming dry, weak and lifeless.
Gwyneth is reportedly a fan of Altrient C, a supplement that allows you to absorb the vitamin straight into your bloodstream.
While we've never seen Gwynnie with chip-fat-style greasy hair, we're not sure how keen we are on letting our locks go au naturel just yet.