Yes, it's normal. If it's very uncomfortable, you can start with a lower dose and ramp up. Your body will adjust over time.
Yes, different strains can target different areas. Bifidobacterium bifidum is the one I've heard is often key for the colon. Acidophilous is known to work more on the upper GI. If you take a powdered form, it's more effective higher up, from what I've gathered.
Diagnosed with ulcerative colitis spring 1999.
Therapeutic dose sulfasalazine.
Probiotics, l-glutamine and fish oil caps. George's aloe vera juice and Mucosaheal. Oregano oil antibiotic, antiviral, antifungal.