Celebrities like Brooke Shields and Alyssa Milano tout the benefits of the line's cleansing conditioner, a one-step system that cleans and conditions the hair. The $30-a-pop price tag has made Dean's line a huge moneymaker, but a group of women has filed a class-action lawsuit claiming that the products are making their hair fall out.
More: How to cut your own bangs without it ending in disaster
The lawsuit claims that Wen products "contain one or more active ingredients that act as a depilatory or caustic agent, causing a chemical reaction that damages the hair strand and/or follicle." Further, they say that the company has failed to act on numerous social media complaints.
Several women have posted about their experiences with hair loss they blame on Wen products on the company's Facebook page. "I used your hair product over the Summer ever since my hair has been falling out and my scalp is so uncontrollably itchy that I just want to rip my head off my shoulders... please tell me how to fix this (sic)," Julia Marie wrote on Dec. 4.
More: 12 Reasons you're losing hair faster than ever
"I only used it a month and lost hair by the handfuls," wrote Michele Woods in another post. "My doctor and hair dresser both were shocked to see how thin my once thick hair has been reduced to by this product. My doctor confirmed it is not hormones or thyroid related. It's this terrible product. I sincerely hope it grows back for others and myself (sic)."
Some women included startling photos of the hair loss they claim to have experienced after using Wen products.
"I can't leave my house I'm depressed wen hair products is responsible for my hair loss I have been shampooing and conditioning my hair with their non-shampooing conditioner which blocked my pores and caused my hair to be basically washed with lotion (sic)," Tracie Hashton posted on Facebook with her photo.
More: Take it from me: Traction alopecia is no joke
Wen is denying that its products are responsible for hair loss.
"[T]here is no scientific evidence whatsoever to support any claim that our hair care products caused anyone to lose their hair," Wen spokesman Joe Hixson told BuzzFeed. "There are many reasons why individuals may lose their hair, all unrelated to Wen hair care products. We intend to vigorously contest the allegations made against our products."