More than 200 people in 40 states have come forward to claim that a popular hair care product is causing them to go bald.

The women are part of a class-action lawsuit against Wen Hair Care and infomercial giant Guthy-Renker. They say that Wen, advertised as a cleansing conditioner, caused scalp irritation, breaking of hair, discoloration, and even baldness, according to an NBC News report.

The law firm of Christiansen Davis is behind the lawsuit, claiming that Wen uses active ingredients that are caustic and can damage hair strands and follicles alike. Further, the manufacturer knew about these problems and sold them anyway, the lawsuit alleges.

The suit doesn’t go into detail on what chemicals are to blame, simply vaguely referring to harsh chemicals contained within the product.

The products are sold by famous Hollywood hair stylist Chaz Dean, as well as Guthy-Renker, which also markets the hugely popular Proactiv acne treatment and other beauty products.

These products are known for their constant infomercials and celebrity endorsements from the likes of Brooke Shields and Alyssa Milano.

But all is not what it seems, these women claim, who say that the hair care product has caused damage to their hair — ironic, as the companies often claim that regular shampoos are responsible for hair damage and their products can help reverse those effects.

Wen has certainly cashed in on its success, pulling in $100 million it just its second year with positive reviews abounding on Amazon. Wen dismissed the claims in a statement provided to NBC, saying there was not evidence that the products were responsible for hair damage or loss.is.