MDPI launches kombucha special issue as research interest grows

MDPI’s new kombucha special issue is a reminder that this drink has moved far beyond kitchen folklore. The Beverages issue, The Future of Functional Fermented Beverages: The Case of Kombucha, is being edited by Dr. Anthony N. Mutukumira of Massey University and carried a manuscript deadline of June 10, 2026.

For home brewers, the useful part is not the academic polish, it is the list of questions the journal is willing to take seriously. The call reaches into fermentation mechanisms, microbiota interactions, functional metabolites, flavor formation, innovative processing, optimization strategies, bacterial cellulose and SCOBY characterization, health benefits, food safety, regulatory questions, and possible toxicity or risk. That is basically the whole real-world kombucha problem set in one place: how to keep a batch clean, how to keep it consistent, and how to keep the drink interesting without letting the process get sloppy.

The regulatory piece matters just as much as the science. The Alcohol and Tobacco Tax and Trade Bureau says kombucha may reach 0.5% alcohol by volume or more during fermentation, and once it does, it is regulated as an alcohol beverage under federal law. The same guidance notes that some kombucha products include fruit juice or other flavors added during production. For anyone bottling at home, that is the practical line between a fizzy tea and a product that can drift into a different legal category if fermentation runs hot.

The special issue also points to where kombucha experimentation is heading. MDPI says the drink can be made from far more than black or green tea, including fruit juices, red wine, dark beer, herbs, molasses, whey, and other materials. That is the part that sounds exciting in a lab and risky in a kitchen, because every substrate changes acidity, sweetness, microbial behavior, and flavor in ways that are not interchangeable. The history helps explain the momentum: a Smithsonian Folklife account says fermented tea spread from China along trade routes, became notably popular in Europe in the middle of the twentieth century, and was sold in Germany by pharmacists under names such as Mo-Gu and Fungojapon.

The bigger reality check is this: kombucha research is no longer just about whether the drink feels healthy. A 2018 systematic review placed it squarely inside the functional food movement in the United States, and that is exactly why the new special issue matters. The strongest value for brewers is not in the hype around health claims, but in the hard questions around sugar reduction, microbial control, alternative substrates, and safety. That is where the future of kombucha is being built, one batch at a time.