After failing to knock out the SIBO relapse with a month of herbals I decided to try something new – Atrantil. Atrantil was designed by a GI doctor in Texas specifically for methane dominant SIBO. It is a combination of three herbs that is reported to block the ability of methanogens to actually create methane thus give relief from symptoms. Studies show it works about 80% of the time in tough to treat cases but it is unclear whether it just stops symptoms or actually kills off the bacteria.