Phenylalanine is actually an essential amino acid, and it exists in a lot of protein-bearing foods. Phenylketonurics are people who are allergic to too much phenylalanine (something about their ability to metabolize it). So, it`s actually fine unless you`re a phenylketonuric.
I also just realized the comic says, “Warning: contains phenylketonurics.” I wonder how they put all those people in that little cup? That was an example of a lack of proofreading before I inked it. I`ll fix that at some point. (ed.: Two and a half years later, it’s still wrong.)
