Read our Privacy noticeCostco is being sued in a proposed class action that claims the retailer falsely advertised its beloved Kirkland Signature $5 rotisserie chicken as having no preservatives. The suit alleges these claims are untrue, as "the Rotisserie Chicken is made with two added preservatives—sodium phosphate and carrageenan." "The presence of sodium phosphate and carrageenan, added preservatives which function as such in the Rotisserie Chicken, contradict the overall net impression that Costco’s ‘No Preservatives’ representations and advertising create," the lawsuit states. Plaintiffs argue that such minimal disclosure is insufficient to offset the prominent “no preservatives” claims that Costco displays on its signage and marketing materials. Editor’s note: This story has been updated to include Costco’s statement.