I finally found a good study on this, http://apjcn.nhri.org.tw/server/apjcn/11/4/298.pdf http://apjcn.nhri.org.tw/server/apjcn/11/4/298.pdf "The results from

I finally found a good study on this, http://apjcn.nhri.org.tw/server/apjcn/11/4/298.pdf http://apjcn.nhri.org.tw/server/apjcn/11/4/298.pdf "The results from this experiment show that while a regulartea drinker would be consuming oxalate every day, the levelsare modest when compared to the amounts of oxalate thatcan be found in other common foods. It would be verydifficult to consume an excessive amount of soluble oxalatefrom the regular consumption of black tea without milk. Theconsumption of black tea with milk would mean that smallamounts of oxalate would be absorbed on a daily basis andwould place black tea in the low risk group of foods, asdefined by Noonan and Savage". Seems like damage is minimal and only some people will form calcium stones to begin with. For me this means I'm not going to make any concern out of it unless I hit an issue. I did find one oft-repeated anecdotal case of a guy who consumed ~4L+ of iced tea per day and had more major issues, but I didn't see any other examples of this.