I read one article trying to discourage people from enhancing their Vitamin C intake which spoke of potential “lethal” doses of C. The only info I could find gave the LD50 for rats in metrics. Converted to US measurements 1/2 of a group of rats would die if they took almost 1/2 ounce of C per 2 pound rat. That would be like giving 2 pounds of C to a large woman or small man which might kill 1/2 of a group like that. So taking large amounts of tablets won’t kill you, and if you get the terrifying symptom of burning urine or acid farts, just take somewhat less.
I have taken 3 to 6 grams of Vitamin C daily for over 45 years and at 81 am in good health. I also took 24 grams of C in one day for a bad flu and never had urinary or bowel symptoms. Once while on a big camping event I met a woman suffering from the effects of 3 yellow jacket stings on her neck. Her eyes were swollen shut, she was choking and her whole body was somewhat swollen. I quickly crushed 10 grams of C in a glass of water. She was able to drink it and in 20 minutes her eyes were open, she was no longer choking and the body swelling was going down. I spent the next 8 hours with her giving her 5 grams every hour along with several other supplements I thought might help. Then she said she felt better and thought she could sleep. I left her with some additional C tablets and told her to take them as she felt she needed. She never complained of any excretory symptoms and I am told she hike out 3 miles the next day. The 3 Chinese clinical trials are using 24 grams of IV C in a day. I hope we will be allowed to hear their preliminary results before September.
Please remember that no CEO will be able to pay himself a $20million salary if he only sells Vitamin C, even if in large quantities.
Please remember that vitamin C doesn't treat any disease, any more than getting rid of aluminum cookware cures alzheimer's.