Trader Joe's is telling its customers to throw away or return the grocery store chain's organic acai bowls because they possibly contain plastic.

The Monrovia, California-headquartered company announced the recall on Feb. 14 "out of an abundance of caution." Trader Joe's said the product "may contain foreign material (plastic)."

Customers who have purchased the acai bowls can discard them, or return the product to their neighborhood Trader Joe's for a full refund, according to the grocery store chain.

It is unclear how plastic may have gotten into the acai bowls.

What are acai bowls?

Acai bowls are generally served as a thick smoothie with various toppings that can be eaten with a spoon.

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Acai bowls have increased in popularity since the acai berry was categorized as a superfood, Julie Harrington, chef and co-author of "The Healing Soup Cookbook," told EatingWell.

Acai, a deep purple berry native to tropical Central and South America, is typically the base of these bowls because they're packed with powerful antioxidants called anthocyanins, Harrington said. To make the berries edible, they're "soaked to soften the tough outer skin and then mashed to form a dark purple paste," she added, per EatingWell.

According to researchers who published findings in the National Library of Medicine, eating acai can benefit one's heart, gut, liver, kidneys and nervous system. The researchers also found that the berries, which have antimicrobial and antiparasitic properties, may help stabilize blood sugar and lower blood lipids.