Each packet of Banatrol Plus and PreB2 prebiotic contains Bimuno, a prebiotic transgalactooligosaccharide, which is a food source for the beneficial bacteria that reside in the gut or colon. Unlike probiotics, prebiotics are not live bacteria/fungal spores so they are not destroyed or digested in the stomach or intestine or destroyed by antibiotics. Clinical studies show that Bimuno promotes growth of just the beneficial bacteria, which then proliferate at a much faster rate than harmful bacteria, helping to restore normal gut flora. Since Bimuno is not a live bacteria, it is  not contra-indicated for immune suppressed patients.
What is Bimuno? Bimuno is the resulting product of intensive research and development, including peer-reviewed clinical studies conducted in collaboration with the University of Reading’s Food Microbial Sciences Unit and other globally recognized research institutes. Bimuno works naturally with the body to maintain and/or restore a healthy balance of bacteria within the GI tract that is lost because of aging, infection, laxatives, antibiotics, inadequate food intake, chemotherapy, and radiation therapy.
Bimuno is the only second-generation (B-GOS) prebiotic on the market and offers added functionality beyond its prebiotic (increases and strengthens beneficial bacteria) and bifidogenic (increases and strengthens immunity-boosting bacteria) effects.
How Bimuno works

1. Bimuno reaches the small intestine intact.
2. In the small intestine, it inhibits adhesion of GI-pathogenic bacteria.
3. In the large intestine, it is fermented by the specific beneficial bacteria (bifidobacteria). This leads to a change in pH balance, resulting in a positive change in the microflora.
4. This selective fermentation increases and strengthens the immunity-boosting bifidobacteria.
5. The resulting increased NK cell and phagocytic activity produces a direct positive effect on the innate immune system.
6. An increase in anti-inflammatory cytokines and decrease in pro-inflammatory cytokines produce a positive effect on the adaptive immune system.

The advantage of Bimuno is its ability to enhance the growth of only the beneficial bacteria because its structure is designed similar to a lock and key that match the shape of the good gut bacteria so only they can digest it. Other prebiotics can be used as an energy source by both good and bad gut bacteria.
Research published in the American Journal of Clinical Nutrition shows that Bimuno significantly increases levels of bifidobacteria in humans within seven days. Bifidobacteria are the most important types of positive, or “good,” bacteria in the gut, as they specifically stimulate the immune system, increase resistance to infection and diarrheal disease, reduce markers of chronic gut problems, and enhance overall gut health.