Pauling responded to concerns about C (ascorbate) and kidney stones in his books. There are 2 main kinds of kidney stones: One kind is more likely to form in higher-pH blood/fluids, and the other in lower-pH blood/fluids. Pauling suggested that if you know which kind you're prone to, you should decrease your risk WITH VITAMIN C!!
The trick is that what we call Vitamin C, the active bit, is the ascorbate ion, NOT just Ascorbic Acid (which is Hydrogen Ascorbate). That is a weak acid, and it will lower your blood's/fluids' pH (which will make you more prone to the low-pH stones but less prone to the high-pH stones). But if you take your C as Sodium Ascorbate or Calcium Ascorbate -- both readily available in bulk crystals from Bronson and others -- those will both RAISE your blood's/fluids' pH, which will have the opposite effect.
Pauling himself followed an intermediate path, and I usually do too: He combined each gram of pure ascorbic acid crystals (the cheapest form) with 1/4 gram of baking soda (sodium bicarbonate), which neutralized most of the Ascorbic Acid's acidity, but not all. Together in water, the two also make a nice fizzy little beverage, a bit like Alka Seltzer. Like LP, I usually drink it while it's still fizzing. (I'm saying "usually" because I accidentally bought a Kilogram (2.2 pounds!) of Sodium Ascorbate crystals from Bronson online a couple of months ago, so it will probably be a few years before I use that up and go back to my "usual"!!!)
