Update by user Feb 05, 2014
It's been three years since my original posting, it took two years for my hair to fully grow back.
I did call the FDA about 6 months after my hair fell out and about one year later a Dr.(I assume, a chemist) who works for them called me back and asked some more questions and said that WEN is being investigated.
More of you need to make phone calls. THIS IS VERY IMPORTANT to aid them in their research. This guy is getting rich off of our heartache (not to mention, our money).
Original review posted by user Jan 22, 2011
My girlfriend and I bought Wen shampoo together and after a few months of use we both started to notice our hair was falling out. At first we didn't realize it was from the shampoo, so by the time we did, our hair was falling out in clumps!
My hair is very noticeably thinner and after about a month of not using WEN, it has finally stopped falling out.
The reason this happens is the lack of detergent in the shampoo causes a build up from sebum and dead cells on the scalp, suffocating the hair follicles which causes them to fall out. I WOULD NOT recommend using WEN as your only shampoo, alternate it with ones with detergent to periodically exfoliate your scalp!
Review about: Wen Shampoo.