The misinformation around Vitamin C is massive (much of it intentionally so]! You note that the animals all produce multi gram doses for themselves daily, and given their generally superior diets compared to us, they are usually under considerably less physiological stress than we are, i.e. so we need more than they do. Plus, we probably have to ingest {orally] 2 to 3 (and maybe up to 5) times as much as they make for themselves, because it is not all absorbed, whereas theirs is already in their blood stream.