Although heavy metal toxic load probably plays an important role in MCS and ES, many forms of chelation are problematic for some people. Some chelators redistribute mercury and have actually been a cause of MCS. One of the most dangerous chelators for some persons has been DMPS. Chlorella and/or cilantro work for some. R-Lipoic acid and NAC can be helpful (start slowly, R-Lipoic can cause a strong reaction at first if your toxic load is heavy, and NAC can irritate the stomach in some persons). I am presently looking into and trying out liquid zeolite products and will post my results here.