Well, I'm not at that stage yet, as I want to know a lot more about it before starting it.
Mind you, the "fasting days" that is talked about in the video means a max 600 calorie intake during the whole 24 hours, so yeah, juicing would probably make sense. Mind you, since I found out that off-the-shelve orange juice contains as much sugar as coca cola (

) it will mean fresh juices for sure. I think I would also continue to take the supplements I take now BTW.
I don't think that the occasional fast does something - that's not what they claim in the video; it has to be kept up as a lifestyle. But you apparently do see results after a couple of weeks - and I don't mean about weight loss, as that's not really the issue for me.
The main focus in the documentary is IFG-1, and the drastic
lowering of it. Already there is an alarm bell of course, as some treatments of PN call for IFG-1 administration IIRC.
I sometimes wish our bodies were a bit more straight forward...