I have an intelligence of 8. I have a good persuastion/charisma but I learned for the mayor of ashbury I needed an intel of 10. so I took it and looked at my intel. it was still 8. I had two points to spend so I went to the save right before I took the potion, raised my int to 10 and whizzed through the diaglogue. so if I decide to raise my int later I can come back and do this quest but I am annoyed that the essence of intellect did not work. I right clicked on it and it disappeared but no bump. tried again and put in in the hand icon and used it on myself but still it did not raise. i thought maybe it would not SHOW the bump up but still work for diaglogue. nope. my game is gog with patch and uap and hi res. I am using a custom backgrond that affected dex and cha but did nothing to my INT.