InternaCALM is a high-strength Saccharomyces boulardii yeast, which works as a probiotic by colonising the intestinal tract and supporting the growth of friendly bacteria. One of the key features of this form of beneficial yeast is that it is able to survive stomach acid. It is a hardy, acid-resistant, temperature-tolerant micro-organism, which is not affected by either antibacterial agents or antibiotics. The herbal olive leaf extract included in this formula works in harmony with the yeast probiotic to provide additional colon health and yeast balance support (including fighting Candida albicans and other gastrointestinal conditions), while the vitamin D and biotin offer support for immunity, inflammation response, mucous membranes and more.