Optifiber Natural Prebiotic Fiber Supplement

In September 2020, a class-action lawsuit was filed against Costco Wholesale Corp. for allegedly falsely marketing Optifiber Natural Prebiotic Fiber Supplement as “natural” when, according to plaintiffs, the supplement contains a synthetic ingredient (wheat dextrin). (Smyth et al v. Costco Wholesale Corp., Case No. 20-cv-4247, E.D.N.Y.)

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