Kombucha is a billion-dollar wellness drink with a borrowed name and a shaky health halo. This episode looks at the living culture inside the jar and separates the biology from the marketing.

We explain how the SCOBY’s yeast and acetic acid bacteria cooperate, why the name comes from a Japanese word for kelp tea, and why ancient origin stories lack evidence. We cover the 2010 alcohol recall, the rise of hard kombucha, what reviews say about health claims, risks from home brewing and acidity, and uses of bacterial cellulose in textiles and e-waste metal recovery.

• How yeast makes ethanol and bacteria turn it into acetic acid and cellulose
• Why sealed bottles led to rising alcohol levels and a 2010 recall
• What medical reviews concluded about kombucha health claims
• How acidity can erode tooth enamel and why pH matters for safety
• How dried SCOBY material is used for clothing and to recover yttrium from e-waste