It produces reuterin and reutericyclin, two antimicrobial substances that inhibit the growth of certain Gram-negative bacteria, such as Escherichia coli, or Gram-positive bacteria, while preventing the destruction of the intestinal flora and lactic bacteria. Lactobacillus reuteri is also active against parasites such as Cryptosporidium parvum, responsible for severe diarrhea.
Lactobacillus reuteri contributes to digestive well-being. This bacterial strain is equally effective in preventing intestinal infections and in treating diarrhea caused by rotavirus. If Lactobacillus reuteri is involved in the construction of the infant's microbiota during breastfeeding, its action goes beyond the gastrointestinal sphere because this bacterium also plays a key role throughout life in cardiovascular health by helping to reduce bad cholesterol levels (LDL).