Matthias Rath M.D., Cardiologist was Linus Pauling's first Director of Cardiovascular Medicine.
His Foundation's Research is based on the fact that humans cannot produce their own vitamin C and is the primary missing link to the prevention and treatment of both cardiovascular disease and cancer.
Why Animals Don't Get Heart Attacks
... But People Do!
http://www4.dr-rath-foundation.org/THE_ ... _book.html
If ascorbate caused kidney damge, 4,000 mammals would be long extinct. They produce ~50 mg/kg ascorbic acid in there livers. Reptiles actually produce it in their kidneys.
Linus Pauling once said that the probability of getting kidney stones from vitamin C was about 1 person in the entire USA.
Anyone concerned about oxalate kidney stones should take 2 Ultra-Mag tablets a day and enjoy life. About 300 mg of magnesium and 50 mg of B6 per day prevent recurring kidney stones about 97% of the time. (Nutritional Influences on Illness)
Magnesium is one of my TOP 10 Supplements, posted elsewhere on this forum.
Everyone using NSAID's would be prudent to supplement with N-Acetyl Cysteine (NAC) and R-Lipoic acid. Not only will this protect the kidneys, but Acetaminophen poisoning is the leading cause of liver transplants. NAC and R-Lipoic acid protects the liver as well.