RDA is 0.090 grams per day. The tolerable upper intake level, or UL, of vitamin C for adults ages 19 and older is 2 grams per day.
This is from my reply post on March 3rd.
I almost died from a very bad lung infection. That's when I extensively researched Vitamin C (almost 25 years ago). Vitamin C is a lifesaver for me. Since taking Vitamin C, I have only missed four days of work because of illness.
Among other vitamins mentioned earlier by others, I take on average 15-20,000mg of Vitamin C per day. I may skip 1-2 days a week...
The two occasions I caught a bad bug, I took a regimen of 20,000 mg every 2-4 hours. I have taken up to 160,000mg in a 24 hour period. Whatever bug I had was knocked out within 48 hours. No Antibiotics in over 20 years.
The body will tell you when it has absorbed all the Vitamin C it needs; it will "flush" any excess. You cannot overdose on vitamin C.
Below is an fascinating paper from a doctor in 1981
VITAMIN C, TITRATING TO BOWEL TOLERANCE, ANASCORBEMIA, AND ACUTE INDUCED SCURVY
That much C is certain to put a load on your kidneys.
VITAMIN C, TITRATING TO BOWEL TOLERANCE, ANASCORBEMIA, AND ACUTE INDUCED SCURVY