Starbucks is facing a proposed class-action lawsuit over protein drinks labeled "Sugar-Free" that plaintiffs say still pack 13 to 21 grams of milk sugar per large serving.
Three consumers filed the case Friday in the U.S. District Court for the Western District of Washington. They want to represent a nationwide class, or separate classes in California, New York, and Washington.
Michael Walsh of California, Anne Legnini of New York, and Elna Potter of Washington accuse Starbucks of marketing eight protein beverages with “Sugar-Free” in the product names while the drinks still contain lactose, the sugar that occurs naturally in milk. Fox Business reported the proposed class-action filing and Starbucks’ response.
The drinks at issue are the hot and iced Sugar-Free Vanilla and Caramel Protein Lattes and Protein Matchas. Plaintiffs say a venti serving carries between 13 and 21 grams of sugar. They cite Starbucks’ own nutrition figures showing the Venti Sugar-Free Caramel Protein Matcha at 21 grams of sugar and the Sugar-Free Vanilla Protein Matcha at 20 grams.
That is the core of the dispute. Shoppers see “Sugar-Free” on the name. The nutrition panel, and screenshots of ordering pages included in the complaint, show substantial sugar from milk. Starbucks launched the protein lineup in September 2025 to meet rising demand for protein-enhanced drinks. The company says it disclosed the facts. The plaintiffs say the product names still mislead.
The lawsuit frames the issue as false and misleading naming, not a failure to post nutrition data.
The complaint states:
"This case is about false and misleading product names. It is not about missing nutritional information,"
Plaintiffs point to Food and Drug Administration rules on “sugar free” claims. As they describe those rules, a food or beverage may carry the claim only when it contains less than 0.5 grams of sugar per the reference amount customarily consumed and per labeled serving, among other requirements. They argue the milk sugar in these drinks blows past that threshold.
They also allege Starbucks failed to give a calorie disclaimer they say FDA rules require when a “sugar free” claim appears on a product that is not labeled low or reduced calorie. The eight beverages contain roughly 270 to 340 calories per venti serving, according to figures cited in the case.
The complaint notes Starbucks has described the products as containing “no added sugar” while still building “Sugar-Free” into the names. Plaintiffs pursue claims under consumer protection and false advertising laws in Washington, California, and New York, plus breach of implied warranty and unjust enrichment. They seek damages, restitution, and a court order barring “Sugar-Free” marketing unless the applicable requirements are met. The allegations have not been adjudicated.
Starbucks rejects the suit outright.
A company spokesperson said:
"We believe these claims have no merit,"
The same spokesperson added:
"Starbucks has consistently and clearly provided information about its protein beverages, sugar-free options, customization choices and nutritional content across product announcements, menus, marketing materials, Starbucks.com and the Starbucks app, and we intend to vigorously defend ourselves in this matter."
That defense puts the company’s public nutrition disclosures against the plaintiffs’ focus on the product names themselves. The lawsuit includes ordering-page screenshots that show sugar amounts listed next to the “Sugar-Free” labels. Starbucks’ position is that customers had the information. The plaintiffs’ position is that calling the drinks “Sugar-Free” still crosses the line when lactose supplies double-digit grams of sugar in a large cup.
Starbucks rolled out the protein beverages in September 2025 as consumer interest in higher-protein drinks grew. The eight drinks now sit at the center of a classic labeling clash: marketing language that promises “Sugar-Free,” milk that naturally contains sugar, and FDA thresholds plaintiffs say the company did not meet for that claim.
Walsh, Legnini, and Potter cast themselves as ordinary buyers who encountered product names that did not match the sugar content. Starbucks casts the case as a meritless attack on drinks it says were explained in menus, the app, the website, and marketing materials. A federal court in western Washington will sort which account holds up.
Honest labels protect customers and honest companies alike. When a name says “Sugar-Free,” shoppers should not need a nutrition deep-dive to learn the cup still holds a load of milk sugar.