See my post of last week under "Hate Epsom Salts ?", I have explained how I substitite ES with magnesium citrate. Like you, I was scared first and thought it HAD to be ES ( I took it in 1/2 Grapefruit juice, 1/2 water), but in my last 10 flushes I stayed with magnesium citrate. From my personal experience, magnesium citrate does the same thing, just more pleasant.