But aren't you simply making expensive urine when you take large amounts of supplements? Dr. Michael Colgan investigated this often made rebuttal. He investigated how much vitamin C we use by giving increasing daily doses and measuring excretion. "Only a quarter of our subjects reached their vitamin C maximum at 1,500 mg a day. More than half required over 2,500 mg a day to reach a level where their bodies could use no more. Four subjects did not reach their maximum at 5,000 mg." Increasing vitamin C intake from 50 mg to 500 mg tends to double serum vitamin C levels. Increasing intake to 5,000 mg a day will double serum levels again. Expensive urine? Vitamin C protects the bowel, kidneys and bladder on the way out. As Dr. Michael Colgan points out the average victim of bowel or bladder cancer spends $26,000 for treatment - mostly to no avail. Originally from New Zealand, http://www.colganinstitute.com/ Remember we are NOT Doctors and have NO medical training. This site is like an Encylopedia - there are many pages, many links on many topics. Support our work with any size DONATION - see left side of any page - for how to donate. You can help raise awareness of CAM.