I wouldn't recommend fasting, especially when petluvr has such bad gut issues. I would go on a low sulfur diet and use low amounts of DMSA at 3 or 6mg's to begin with. Considering your health issues are pretty servere I would get the recommended supplements that Cutler states are essential to the protocol and start taking them for a week to allow your body time to adjust to the supplements, then try some DMSA at 3 or 6mg's. I noticed that some people are using even lower doses than 3 or 6mg's of DMSA on the FDC boards for issues that are the same as your health issues petluvr. 25mg's may be too high for you. 6.25mg's is often stated as a starting dose to begin with, but I would certainly go lower. It's up to you. C