Betterlife, I stopped eating fruit and veges when I first started Heathers diet because of the whole IF theory. However I became so C it was horrible! I really need a daily dose of fruit and veg, and luckily for me skin, skin off, raw or cooked, it doesn't really affect me either way. Cooked however seems to sit better in my tummy (I suffer from really bad bloating). Its a matter of finding out how much, and what sort of, fruit and veges work best for you. As for how IF helps people with C, I suppose its because we need the bulk to get our bowels working, as well as the vitamins and minerals (magnesium levels are directly linked to BMs)?
Heather's theory isn't to stop eating fruit and veg but to make sure you combine it with some soluble fibre like rice or pasta, or solube fibre fruit and veges. I find combining bananas and mango with other IF fruit works well, as does rice flakes cooked with rice milk and stewed fruit like nectarines. Combining sweet potatoe or pumpkin with other IF veges works well too. The thing to remember is that it takes a while for your BMs to respond to diet. Try increasing your fruit and vege intake for a week or so and see what happens.
As for SFS, I don't take one because I don't really need it, and when I did take one I got terribly bloated and gassy. I prefer to get my soluble fibre from food. But thats just me, I don't like relying on supplements, and in contrast LOTS of people benefit tremendously from SFS. The thing to remember is you really need to make sure you drink enough water, otherwise the SFS will only make you more C. I would suggest at least 2 - 3 litres a day or you're only going to make the C situation worse.
As for other supplements..... I hate the thought of relying on a concoction of supplements for life. Magnesium is the only one I use. I've tried aloe vera, and digestezy, which turned out to another laxative, but am very concerned about my body devloping a reliance on these things to go. For me, diet and lifestyle are much more sustainable ways of managing C.
But again everyones needs are different. If you do a search on supplements for C you should come up with a few ideas. Sometimes our systems just need a kick start, while we are improving our diet.
Good luck, let me know how you go
-------------------- ~ Live life, don't let life live you ~