Magnesium sulfate / potassium sulfate / sodium sulfate
"Whoever said the only thing worse than taking it is taking the second dose had it right. It's salty and disgusting. I mixed with lemonCrystal Lite which helped. The difficult part is chasing it with another 16oz of water. You get so full you may vomit. Once it starts working it's not bad. No cramps, no "near misses". Overall a barbaric experience I hope to never repeat. Rated 10 for the effectiveness, 0 for the experience, so average rate is 5."