10 Kombucha Effects and Side Effects, What You Need to Know 1. Overview Kombucha is a fermented tea beverage that has been consumed for centuries due to its potential health benefits. Produced by fermenting tea, sugar, and a symbiotic culture of bacteria and yeast (SCOBY), kombucha is abundant in probiotics, antioxidants, and other advantageous compounds. This article will examine 10 advantages ..