PORTLAND -- They're flashy, fruity, fortified and at stores across the nation, "superfruit" drinks are flying off the shelves.

"People will come in and buy them by the case, 12 bottles at a time," said Rob Tutor, store manager at Haggen in Southwest Portland.

"Boost" is one of the latest brands in this juice genre. It offers alluring formulas such as "Beauty, "Happy" and "Youth."

The formulas contain extracts from exotic fruits such like mangosteen and gogi, acai and noni berries. They're touted as nature's most anti-oxidant-rich fruits and packed with trace minerals, but are they worth trying in the form of a juice?

At around $4.00 a bottle, some customers we talked to didn't think so. Others said they'd try anything once and might continue to buy them if they tasted good. But what do the experts think?

"To me it's just another marketing ploy," said registered dietitian Kimra Hawk. Hawk said the drinks do contain antioxidants, but not enough to validate what their labels imply. She also said they're packed with sugar and devoid of fiber.

"People need to eat more fruits and vegetables and that will make a difference in their health," Hawk said.

While you might not find gogi berries in your produce department, Hawk said you’ll find something better: whole superfoods like pomegranates, artichokes and blueberries-- all rich in antioxidants. When picking out produce, Hawk suggests thinking of a rainbow to get a good variety and she says the darker the color, the better.

Hawk recommends shooting for 5 to 9 servings of fruits and vegetables a day and limiting juice intake to 8 ounces, be it orange, apple, or mangosteen.

As for the expensive stuff in a bottle?

"I would look at the produce section of your grocery store and spend your $4.00 on something else," said Hawk.