Postbiotics powder is bioactive compound made when the healthy bacteria in your gut ferment fiber. There are various types of postbiotics, and they offer health benefits similar to those of probiotics. Health benefits of postbiotics. Probiotic supplements are a way to add good bacteria to your body. Probiotic supplements are made of both bacteria and yeast. Common probiotic bacteria can include lactobacillus and bifidobacterium. The most common yeast found in probiotics is saccharomyces boulardii. http://www.probioway.com/postbiotics-powder/