Bob’s red mill products are very superior to almost anything else out there; organic food products are a must on the diet if you want to get healthier faster. I believe that you could be reacting to the oat bran because it isn’t bob’s red mill brand and possibly because it isn’t organic. One of the reasons I have gotten healthier so quickly is because I have gone all organic with my diet (except my lunchtime salad).
I would give it a try in a few weeks to see if any reaction, but you likely will get a reaction throughout your treatment.
I used to react to non-organic sysco chicken that has antibiotics and hormones in it, so all I gotta say is go organic!