Acai’s dark purple berries are from a palm tree found throughout South America and are touted as an antioxidant-rich food source that some nutritionists believe can protect cells from damage, according to WebMD. Proponents say the berries are richer in antioxidants than cranberry, raspberry, blackberry, strawberry or blueberries.

The popular breakfast item was recalled last week due to possible plastic contamination. The grocery chain did not say if the product had made anyone ill.

“Out of an abundance of caution, please discard any Trader Joe’s Organic Acai Bowls, as the product may contain foreign material (plastic), or return them to your neighborhood Trader Joe’s store for a full refund,” the notice on Trader Joe’s website states. No illnesses or injuries have been reported to date, according to Real Simple.