Carrie served as a spokesperson for Vitaminwater in 2007 and 2008. She specifically endorsed the "tropical citrus" flavored brand, which promotes energy.
"B vitamins + guarana. + other natural flavors. They say a little energy can take you a long way. and if there's anyone who knows that, it's our all-American girl Carrie Underwood, she's gone from rocking out the church aisles in Checotah, Oklahoma to taking over the spotlight in the world's largest arenas. so how does Carrie dazzle adoring fans, smile in hi-definition, and still manage to go multi- platinum twice, aka ambi-platinous (the internet said it's a word)? she grabs this bottle that's got B vitamins and guarana - it helps her keep a grip on the wild carnival ride she calls life. Excellent source of C and B vitamins. Vitamin C: 100%; vitamins B3, B5, B6, B12 (40%); 20 mg natural caffeine + 10 mg guarana; electrolytes. Per 8 fl oz serving, 2.5 servings per bottle."