"When I purchase a food item at the supermarket, I can be confident that the label will state how much riboflavin is in it. The United States government requires this, and for a good reason, which is: I have no idea. I don't even know what riboflavin is. I do know I eat a lot of it. For example, I often start the day with a hearty Kellogg's strawberry Pop-Tart, which has, according to the label, a riboflavin rating of 10 percent. I assume this means that 10 percent of the Pop-Tart is riboflavin. Maybe it's the red stuff in the middle. Anyway, I'm hoping riboflavin is a good thing; if it turns out that it's a bad thing, like "riboflavin" is the Latin word for "cockroach pus," then I am definitely in trouble."