Hi Anna,

there are so many recipes (different ingredients, relative amounts), so
many different ways to prepare or store Kombucha that all those Ks I
tasted myself over the years can be as different as day and night. I
used to drink it on a daily basis during my hardcore
bioorganic/-dynamic years and liked it a lot.
I never heard of any negative health effects, just the opposite.
PS: another healthy fermented drink that is easily prepared is
"waterkefir". Not as strong in taste as Kombucha, but a lovely,
slightly sparkling all-day beverage. If prepared with a reduced amount
of culture, and fermented slightly longer it gets similar in taste to
my beloved elderflower champagne.

See he
http://members.tripod.com/solinti-ivil/Waterkefir.html

.... and now back to a cup of that unknown First Flush

Best,
Karsten / Darjeeling