Probiotics, specifically from Lactobacillus, show promise in improving fertility and treating recurrent implantation failure (RIF) in couples undergoing in-vitro fertilization (IVF). A group of experts in gynecology, obstetrics, and fertility fields agree that probiotics can restore microbial balance, reduce inflammation, and enhance the genital barrier, potentially preventing miscarriages and aiding in maintaining pregnancy. They recommend using Lactobacillus-based oral probiotics before embryo transfer to increase implantation and pregnancy rates. Probiotics offer a safe and non-invasive way to treat infertility and RIF by promoting a healthy microbiome and improving the chances of successful pregnancies.