When you take the non lipo form for C you can only take as much as your bowels can tolerate. This form is very good to keep the gut healthy; the lipo form or IV form will get into the cells as it is able to pass to the cells and will not bother the bowels. I have heard of many that can take up to 50 grams a day of lipo or IV and effectively reduced their cancer.
There are also some very good IV options for carcinoma as well too, I would look into Rigvir and Varumin both from Europe that we have found is very effective. Our site has many of these and more listed on our Cancer Treatment page - google Jesichashope - it is surprising what is available that we are not told.