It’s red and yellow coloration immediately reminded me of McDonald’s, but that is where my familiarity ceased. I believe it is called C1000 because it contains 1000mg of vitamin C (16% of your daily recommended allotment). “vitamin DRINK” is written largely across the center of the bottle, so this may be the actual name. I am unsure if the drink contains any other vitamins because the only other recognizable character on the bottle is the number 8 displayed between some Japanese characters and followed by an explanation point. 8!!!! GREAT!!! 8 vitamins maybe? Vitamin C, vitamin big-eyed boy that looks like a girl, vitamin bear driving car?
The actual drink was carbonated. It tasted like a milder (less medicine-tasting) red bull with a stronger citrus taste. The drink tasted average to me. There was nothing bad about it, but it just got boring after a while.