The Coca-Cola Co. faces several certified classes in a long-running lawsuit accusing the company of misleading consumers about whether its flagship soft drink contains artificial flavors or preservatives.

U.S. District Judge Jeffrey White of the Northern District of California on Feb. 14 partially granted class certification in the multidistrict litigation, which dates back to 2014, finding that the lawsuit presents common questions about how the company uses phosphoric acid. Plaintiffs claim phosphoric acid is both an artificial flavor and preservative—an assertion that the company contests—and that they were misled by Coca-Cola labels claiming “no artificial flavors. no preservatives added. since 1886.”