Wen Haircare has engaged Abernathy MacGregor Group as the direct-marketed hair product line faces legal and PR woes amid allegations of hair loss among its users.

wenWen, developed by Hollywood stylist Chaz Dean, is sold by Guthy|Renker, the direct marketing giant behind Proactive and it cosmetics, among other brands.

Users in 40 states filed a class-action suit this week against Wen and Guthy-Renker, claiming Wen's conditioner caused scalp irritation, hair damage and hair loss, among other issues.

A bevy of celebrities have marketed the brand.

AbMac Los Angeles VP Joe Hixson is speaking for Wen, which issued a statement claiming there is no scientific evidences for the charges. "We intend to vigorously contest the allegations made against our products," read the statement. "And we encourage any customer with any questions to contact us."

The lawsuit has been picked up nationally by major media.