Bottom Line: Most people will need to reduce their dosage of diabetes medication or insulin when following a low - carb diet. (mediatrendings.com)
Vitamin C can be taken to the point of having loose stools and then reducing the dosage a bit. (believemidwiferyservices.com)
However, one short term side effect of creatine noted is that athletes who took more than the recommended amount of creatine experienced diarrhea, however this went away after reducing the dosage. (bodybuildingforyou.com)