Costco Faces Lawsuit Over Sugar-Free Drink Mix Labeling Allegations

How Maltodextrin Affects Sugar-Free Claims

A consumer has filed a lawsuit against Costco Wholesale Corporation, claiming the retailer's Kirkland Signature sugar-free drink mix contains sugar despite being marketed as sugar-free. The case was filed in federal court in California on October 1, 2026, and alleges violations of consumer protection laws due to misleading product labeling. The plaintiff purchased the product believing it contained no sugar, only to discover through independent testing that it includes sugar-derived ingredients.

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The lawsuit centers on the drink mix's ingredient list, which the plaintiff claims lists maltodextrin—a carbohydrate derived from starch that can affect blood sugar levels—without clearly disclosing its impact. While maltodextrin is not classified as sugar under FDA labeling rules, the plaintiff argues it functions similarly in the body and should be disclosed as such for consumers managing diabetes or sugar intake. The product is sold in Costco warehouses and online, marketed as a zero-sugar alternative for beverages like lemonade and iced tea.

What Does This Mean for Consumers Seeking Sugar-Free Options?

Maltodextrin is a common food additive used as a thickener or filler, and although it is not chemically sugar, it has a high glycemic index and can raise blood glucose levels. The FDA allows products containing maltodextrin to be labeled „sugar-freeif they contain less than 0.5 grams of sugar per serving. However, critics argue this loophole misleads consumers who associate ”sugar-freewith no glycemic impact. The lawsuit contends that Costco's labeling exploits this regulatory gap, particularly affecting health-conscious shoppers.

If the court rules in favor of the plaintiff, Costco may be required to reformulate the product, change its labeling, or provide refunds to purchasers. The case could also prompt broader scrutiny of how retailers label products containing maltodextrin and similar ingredients. Consumer advocacy groups have begun calling for clearer labeling standards to prevent confusion around sugar-free claims, especially for individuals managing metabolic health conditions.

Frequently Asked Questions

Is maltodextrin considered sugar under FDA regulations? No, maltodextrin is not classified as sugar by the FDA, so products containing it can still be labeled sugar-free if they meet the sugar threshold. However, it does affect blood sugar levels similarly to carbohydrates.

Could this lawsuit affect other Costco products? Possibly. If the case sets a precedent, it may lead to reviews of other Kirkland Signature products labeled sugar-free that contain maltodextrin or similar ingredients, potentially prompting label changes across the retailer's lineup.