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For anyone who suffers from trichotillomania, a good idea would be to try N-acetylcysteine (NAC)
Its a food supplement which you can easily buy over the counter, or even online via amazon.
A lot of people suffering from trich report that it's been helpful to ease or even completely eliminate their urge to pull.
From reading the Amazon reviews of one of the products, its apparent that this supplement is used to treat a lot of different disorders (from bipolar to parkinsons to what not)
You can read more about it here: /treatment/medication/n-acetylcysteine (there's also a link in the article where you can purchase the supplement).
And if you buy and use it - please report back. Did it help you? What effect did it have? Any side effects?