Beverages Which tea bags have tannic acid? March 14, 2026 by pups | Leave a Comment Tea bags themselves do not inherently contain tannic acid; rather, the tannic acid comes from the tea leaves used to fill them. Many traditional black teas and some green teas naturally contain significant amounts of tannic acid, also known as tannins. The brewing process extracts these compounds from the leaves into your cup. Understanding Tannic […] Read more »