Dietary supplement based on oral probiotic specially designed to improve fertility. Designed for oral administration in capsules, especially indicated to improve fertility, the composition generates an environment conducive to embryo implantation. In the composition, we find the probiotics Lactobacillus rhamnosus, L. crispatus and L. plantarum, together with vitamin D. These active ingredients balance the microbial biodiversity, thus generating the necessary environment to receive the embryo and increase the chances of implantation.