For ascorbic acid (vitamin C) specifically, there is such a thing as too much of it.. in humans, the level that is too much is when it gives you loose stools.. if you back off that, then the body is likely using what it needs.<p>Most animals make vitamin C internally in the amounts they need. We are only one of a handful that do not, because we have a mutation that prevents us from finishing the process, otherwise we would also be making it ourselves too.<p>Animals don't drop dead left and right from cancer. I would suggest if one tries to eat a balanced diet then this will help with avoiding cancer.<p>Lastly, the longer you live, the more certain it becomes that you will get cancer of any type. What we are doing here is trying to live healthy enough that we die before we live long enough for cancer to become a problem.