(NEWSnet/AP) — Popular soda brand Poppi faces a class-action lawsuit filed by a consumer who says its products don’t improve gut health as much as their marketing suggests.

In a lawsuit filed last week in U.S. District Court in San Francisco, Kristin Cobbs said she purchased Poppi drinks multiple times because of their labels, which say they are prebiotic sodas and feature the slogan, “Be Gut Happy. Be Gut Healthy.”

But Cobbs later found that Poppi drinks contain only around 2 grams of prebiotic agave inulin fiber, which she said is insufficient to provide any real benefit.

Cobbs cited research showing that consuming 7.5 grams of agave inulin daily for three weeks was insufficient to confer any meaningful prebiotic benefit.

The lawsuit said if consumers drink more Poppi, any prebiotic benefits would be outweighed by increased sugar consumption.

Cobbs is seeking monetary relief for herself and similar customers.

Austin, Texas-based Poppi said in a statement Monday that it stands behind its products.

“We are on a mission to revolutionize soda for the next generation of soda drinkers, and we have diligently innovated to provide a tasting experience that millions of people have come to enjoy,” the company said. “We believe the lawsuit is baseless, and we will vigorously defend against these allegations.”

Poppi is one of dozens of brands in the exploding category of functional beverages, which claim to improve health and wellness.

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