I like your plan for Vitamin D3 to boost your immune system. I recommend enough D3 Geltabs to get your blood level up to 70 to 80 ng/ml. For most folks this requires 8,000 IU to 10,000 IU daily:
This may not help your SIBO, but it can't hurt to boost your immune system. Also stomach acid does not function properly in a person deficient in iodine.
Read this report by Dr. Sircus: Antibiotics ">http://drsircus.com/medicine/cancer/the-end-of- Antibiotics