BERLIN (Reuters) - Mediation between Bayer and plaintiffs in the United States aims to clarify all justified claims related to Roundup herbicide both at the national and state level, mediator Ken Feinberg told a German magazine.

"The mediation is going slowly but steadily," Wirtschaftswoche on Wednesday quoted Feinberg as saying.

Bayer is trying to reach a settlement after earlier court rulings against it. The German drugs and pesticides maker, which acquired Roundup and other glyphosate-based weed killers as part of its $63 billion takeover of Monsanto last year, faces potentially heavy litigation costs as plaintiffs claim Roundup causes cancer, something Bayer disputes.

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(Reporting by Riham Alkousaa; Editing by Michelle Martin)