Soy is inflammatory which is not good if you have leaky gut. A goal for everyone should be to reduce the inflammation of the gut and not make it worse.
Since it is genetically modified and you cannot get organic soy easily, this will create an immune response within the body where the body see’s it as a foreign invader. This creates a response from the body to fight it off.
The problem with multivitamins is that there is no multivitamin that is 100% DV for everything you need; most of them have specific vitamins at higher or lower levels which can lead to an imbalance. For instance, most candida sufferers are deficient in biotin, but is your multivitamin 100% DV in biotin? What about the trace minerals you need while on the diet as well? Its best to get each vitamin separately so you can control the doseage.