Hellman's here in Canada is made with just Canola Oil. As are most non-soy commercial mayos. Canola oil, though, is also goitrogenic, similar to soy, so this is not a great substitute. I really hate making my own but am forced to if I want it due to my thyroid issues. I use a combination of bacon fat and EVOO.

I'm dying to try one made with macadamia nut oil but it's so expensive - like liquid gold...so I'm afraid I won't like it. Hmm I might take capmikee's suggestion about the chicken fat....