Mammoth ate my Regurgatonic
 

I turned the Regurgatonic in to Mammoth and he ate it. No sign that he registered it, no faction hit, no exp, and no Bayle list.

The title of this thread sounds really gross

Gnome has a chance to give you a bad Regurgatonic that wont work, its intended and part of the risk with the quest. You will have to try again, or kill Mammoth.

If you are a class that can cast Identify (all INT casters at level 16, I believe) you can "identify" whether or not the regurgitonic is a bad mix or a good mix.