Kombucha has jumped out into the mainstream. It may well have beneficial health benefits. It may also have negative health benefits.
It has a long history of word of mouth distribution to the point that it landed in my fridge decades ago, although never used.
The science seems to have dragged on this, not least because uniformity is certainly an issue. It produces a complex of products that may have no end of biological value. Thus we have multi - variant problems before and after.
Drink to Your Health?