Surefall Glade Mammoth Quest
 

You speak to the Druid trainer in Surefall and she tells you there have been Problems with the Great bear. She asks you to take a bottle of Nitrates to the zoo keeper in Ak Anon, he will give you a special potion to give to the bear. Once you do this the bear is supposed to cough up something that you return to the druid trainer.

I traveled to the zoo keeper, received a bottle of reguritonic, when i try to give it to the great bear "Mammoth" he does not accept it.

There's 2 versions of the Regurgitonic.

From a post on Allakhazam:

So get a 16+ Int caster to cast Identify while you're holding the Regurgitonic to find out if its the quest or the item causing the trouble.

This quest is working correctly

Thanks for the help