It is not easy, but you need to make the difference between die off (herxheimer reaction) and intolerance.
Perhaps the supplement form has another component you are intolerant to - but magnesium is a nutrient that is essential in order to heal of candida - magnesium potassium sodium and antioxydants are important, they going to support our adrenals and your liver AND fight die off
Start slow and allow you body to get used to the liquid form of mag. liquid assimilates better so at this stage it is your best option
Die off is a complex issue. Pain in the bowel or the sudden feeling of being very tired= intolerance - headache, brain fog, feeling odd= die off they are close and it is not always easy to tell them apart : //www.curezone.org/blogs/fm.asp?i=976122