Natalia, I did not say you have to cure candida first--meaning by that that first you must use stuff to cure candida ONLY.
You must treat candida and leaky gut TOGETHER, as they go hand in hand, but the first thing to heal--to disapear--will be the extreme proliferation of the candida--the white stuff-- then the leaky gut, then the allergies. These are different symptoms, and they will not all disapear exactly at the same time.
To give you a comparison--15 years ago, I had an accident. I had several bruises, wounds and broken bones.
Despite the fact they were all treated together, some disapeared in days, some took months to get better.
However, I don't see how you can heal leaky gut if you still have thriving colonies of candida in your gut. Inflamed/infected tissues cannot heal if they are still chockfull of bacteria or fungi causing the inflamation. Candida causes leaky gut, not the reverse.