The Idaho Observer reports a first-hand account of how aspartame, known as Equal, makes a great ant poison.
This lady had a bad ant problem in her bathroom, and the Orkin Man wasn't able to help. She read that aspartame was originally developed as a poison, so she thought she might try using it.
It worked! The ants took the aspartame crystals away and the ant hill was completely gone - all the ants either dead or evacuated.
She doesn't know the nature of how aspartame poisons the ants. It is an excitotoxin that causes specific brain cells to be become excited to the point where they quickly die.
As with any poison, she warns, wear gloves while using it and DO NOT get any in your mouth!
NOTE: As far as I can tell, the Idaho Observer is not a regular daily newspaper, like the name sounds. It seems to have a lot of articles about aspartame, so this article may be suspect. Still, it's worth a try. We've had ant problems from time to time in our house, and I'm wondering if this might be a solution.