Bests & Worsts Reviews from Amazon

I bought these vitamin C supplements to use in my chemistry lab. I had the students perform an acid-base titration with the tablets to verify that the tablets contained the stated amount of vitamin C. Averaging the class results we found that they contained slightly less then the stated 500 mg, though to be fair my students are just learning and there technique is far from perfect. We did find, however, that the vitamin C content seemed to be relatively consistent between pills. Other brands that we had tested were not so consistent in their results.