Many teas,exotic or not,mushrooms,fruits etc tend to have a high content of vitamin C as well- goji,inca berries,camu-camu
Also one has to be on the look out for the different green powrders out there(barley,wheat grass.etc,even hemp powder..) that may contain acerola etc..
To be on the safe side I wait 4 hrs before taking any of them after having took the Miracle-Mineral-Supplement ...
Even the USDA analysis of vitamin C content in many vegetables,fruits etc is silent on many of the above..