[Cecily]

Alright so we're narrowing it down to probiotic benefit. That's helpful. Thank you.
I'm sure you can see why at a cursory glance it looks dubious at best.

According to a 2000 review, "It has been claimed that Kombucha teas cure asthma, cataracts, diabetes, diarrhea, gout, herpes, insomnia and rheumatism. They are purported to shrink the prostate and expand the libido, reverse grey hair, remove wrinkles, relieve haemorrhoids, lower hypertension, prevent cancer, and promote general well-being. They are believed to stimulate the immune system, and have become popular among people who are HIV positive or have full-blown AIDS".[2] People drink it for its many putative beneficial effects, but most of the benefits were merely experimental studies and there is little scientific evidence based on human studies.[1] There have not been any human trials conducted to confirm any curative claims associated with the consumption of kombucha tea.[1] There is no high-quality evidence of beneficial effects from consuming kombucha.[4]

A 2003 systematic review characterized kombucha as an "extreme example" of an unconventional remedy because of the great disparity between implausible, wide-ranging health claims lacking evidentiary support, and the potential for harm kombucha has.[4] Ernst concluded that the number of proposed, unsubstantiated, therapeutic benefits did not outweigh the known risks, and that kombucha should not be recommended for therapeutic use.[4] Kombucha only appears to benefit those who profit from them, according to a 2003 review.[4]