But what I can state definitively is that kombucha drinks—specifically GT's Kombucha in the dubiously named Trilogy flavor—are delicious.
I also endorse the Cayennade flavor, with the caveat that there are actual chunks of cayenne floating in there.
If you prefer your kombucha with no additional flavors, you are a monster but I respect the hell out of you.
In conclusion, GT's Kombucha is a delicious beverage that will definitely not make you immortal. But since immortality sounds terrible anyway, I recommend that you (carefully) crack open a Trilogy and give it a try.