Chances are you've seen the bright bottles and flashy displays at your supermarket: Vitamin Water … Sobe Life … Oxygen Water … waters with protein and fiber … even waters that offer to cure your hangover or pump up your sexual vitality.
Water may be the oldest drink there is, but enhanced bottled waters are the newest, hottest thing in beverages.
The enhanced water category has become a $1.5 billion industry, with more than 150 products available, says Barry Nathanson, editor of the trade publication Beverage Spectrum. The question: Are there any benefits?
Nutritionist Dr. Pamela Peeke believes that you should think before you drink.
While a little more water can't be bad, some of the purported pluses these enhanced waters tout might not entirely live up to the hype, she says.
For example, what health benefits come from adding more oxygen to water -- as in Active O2? Peeke said you can easily have 10 times more oxygen just by breathing in and out than you'd get by consuming one of these oxygenated waters.
"The bottom line is if you wanted more oxygen, open your mouth and breathe," she said.
Vitamin Water is the country's best-selling enhanced water -- it's even endorsed by such celebrities as Shaquille O'Neal and Carrie Underwood. But along with the water's vitamins, Peeke says it packs another punch too: calories. In fact, an entire 20 oz. bottle of Vitamin Water has 32.5 grams of sugar, just 6½ grams less than the sugars in a 12 oz. can of Coke.
So, are these healthy beverages?
"Define healthy for me," Peeke said. "There's no peer-reviewed research that we're aware of that says in those kinds of combinations and percentages of vitamins and refined sugar, that you're going to suddenly become healthy."
Coca-Cola, the maker of Vitamin Water, told ABC News in a statement that "we don't make health claims beyond nutrient content claims for our products. We state very clearly on our label what's in our product and consumers can be sure they are receiving the nutrients listed in each bottle of Vitamin Water."
Other enhanced waters also add ingredients that sound like they're good for you, such as protein and fiber, to help curb your appetite. Kellogg's created a drink called K20 Protein Water that has 5 grams of protein, 5 grams of fiber and 50 calories.
The company's ad says the product "helps you take the edge off your hunger and still lose weight."
But Peeke said, "Five grams of protein probably is not going to do that. You're going to feel fuller just having drunk the entire bottle of water. Drinking this will not stop you from eating that large slice of cake in front of you."
Kellogg's said, "There are numerous published studies and articles on how protein and fiber work to promote satiety, and we relied on this data to support our K20 claims."
What about a water that says on its cap that it was "created by physicians"? That is a big selling point for the waters from Function, founded by 32-year-old orthopedic surgeon Dr. Alex Hughes.
"We spend so much time and effort either developing devices or pharmaceuticals to help sick people," Hughes said, "but very little time necessarily spent trying to enhance the lives of healthy, hard-charging adults."