Higher hexane levels have been found in olive oil than in some seed oils, but amounts were below safe thresholds.

“One of the concerns is hexane use to extract the oils from the seed cakes and stuff like that. So, the use of solvents to get these oils out of their native source. There's some interesting literature showing higher hexane levels in olive oil than in, I forget, it was some other seed oil, whether it was canola or sunflower... But nevertheless, the hexane amounts were well below established safe thresholds.”