They used to be known for using a cheap Chinese grade creatine monohydrate in the past ('90's).If you start shitting your pants and getting a gut ache, dump it in the toilet where it belongs.
Twinlab's quality control has declined over the years.. I would consider other brands before picking up any of their supps.
i've got kind of a crazy digestive system in that i digest 99.9 percent of anything i use supplemant or food wise, very very rarely get any type of intestinal distress.