SUMMARY: Ayatullah Sistani's ruling is that foods with minute amounts of vanilla extract are allowed. Ayatullah Khamenei's muqallideen are also allowed to follow Ayatullah Sistani's ruling on this matter (if they believe he is equally a'lam).
This video is an excerpt from the Sheikh Jaffer H. Jaffer's lecture "Addressing Common Questions / Issues" at https://www.youtube.com/watch?v=cHmCc06BqW0
