I've never even thought of this.

I have a wilderness medicine text, put out by the Wilderness Med society. I'll scrounge it up in a few days (it's in MI, I'm in CA) and see what it says, if anything.

Meanwhile, I'll see if I can find anything online.

Any chance you know what type of stone you tend to get? Some are related with diet, and maybe planning accordingly can decrease the chance of getting one.