Countless health claims swirl around kombucha, a fermented drink made with tea, sugar, bacteria and yeast. Although there is little research backing up the would-be superfood benefits of kombucha, some studies have suggested it can help with gut health in place of probiotic supplements, and also support the body’s immune system. There risks of this drink are even clearer, however, particularly for vulnerable groups such as pregnant women, young children and anyone with a weak immune system. What’s more, if it’s made at home in unsafe conditions, unwanted bacteria that grows in it can cause all…