Reutericyclin (Reutericycline), a unique tetramic acid, is an antibiotic produced by some strains of Lactobacillus reuteri. Reutericyclin (Reutericycline) exhibits a broad inhibitory spectrum including Lactobacillus spp., Bacillus subtilis, B. cereus, Enterococcus faecalis, Staphylococcus aureus, and Listeria innocua[2].