I never heard of any mushroom being involved. Although I was thinking of making my own jt must havent learned enough about cultures yet. Its not from the store but rather a local small company that makes and jars it.
The ingredients in the one I purchased are:
Organic raw kombucha tea (filtered water, organic evaporated cane sugar, proprietary blend of fair trade, organic black and green teas, live Georgia grown kombucha cultures).
That you for your input.