Consumed sparingly, vitamin water isn't likely to cause harm, but anyone interested in taking it for its health benefits may want to consider more natural forms of nutrition. "If we're taking supplements instead of eating whole foods, we're missing out on other vital nutrients that food has to offer," says Naidoo.

When 50 Cent partnered with Vitamin Water to endorse the brand, he didn't want cash. He wanted equity. Three years later, Vitamin Water was acquired by Coca-Cola resulting in a payday of $100m for 50 Cent.

True to its marketing, Vitamin Water does contain added vitamins. One bottle alone does not offer enough to meet your daily requirements, and the label suggests drinking 1-2 Vitamins Waters per day.

The average cost of production for a bottle of vitamin water in the industry is $4 while its average price is $7.