A multi-strain probiotic supplement designed to support immune health and digestive regularity. Theralac^® contains 30 billion CFU of lactobacilli and bifidobacteria probiotic cultures for complete intestinal coverage. The strains synergize and work together to promote digestive health, wellness, and a return to regularity so you can feel your best. This probiotic is part of Dr Horowitz's regular probiotic regimen to support GI health while on antibiotics for the treatment of Lyme and associated diseases. The strains of the 5 bacteria are placed in sodium alginate coated capsule to ensure that 95% of the probiotic strains make it to the intestines (FDA patent) without being destroyed by the stomach acid. There are multiple published scientific references on the strains in Theralac.  It is an excellent choice for a probiotic supplement, whether for daily use with or without antibiotics (Dr H and his wife take it regularly).