Friendly bacteria seem to be pleased with high fiber foods. I understand that inulin (Jerusalem artichoke root) is one of the best and is OK for diabetics. It does not affect insulin levels. I think it is also due to its being a non-digestible dietary fiber.
When I use IP6, I'm not too worried about chelation of the minerals. I just make sure that I take it on an empty stomach. By then, most minerals will already have had time in the digestive process.