fem-dophilus® contains two patented and clinically documented probiotic strains, Lactobacillus rhamnosus GR-1® and Lactobacillus reuteri RC-14®, discovered and developed by Dr. Gregor Reid and Dr. Andrew Bruce at Urex Biotech. Over 20 years of research supports the oral use of GR-1® and RC-14® to colonize and protect the vaginal tract