This vitamins are excellent, I've being taking them for a few years now and never had any problems.
I found out when I got home that the caplets are made with wheat flower, and they were causing me a reaction. I've only recently noticed my gluten intolerance, so am not used to checking so carefully. Now I have two bottles of this that I cannot use. Beware if you can't tolerate gluten this is NOT the way for you to get Vitamin C!
As I am suffering from GERD, my doctor advised that I take Ester-C that will not turn acidic in the stomach. I have been taking Ester-C 1000 mg. for so many years and find that it helps not only in preventing infections but also maintain my good complexion. Will continue to use it forever..