Thanks for the info! My POTS/OI symptoms are fairly mild, but now that you've made me think about it, it might not hurt to increase the salts intake to see if it makes a difference. Kinda nice, in a weird sort of way, to be working on the symptoms that were so low down on my priority list. *grin* My daughter has been prescribed Florinef and extra K to increase her blood volume since even increasing her salt intake didn't manage her POTS/OI symptoms. So far, they've worked pretty well for her.