COT statement on idiopathic environmental intolerance (IEI)

Idiopathic Environmental Intolerance (IEI) is the name given to the condition also known as Multiple Chemical Sensitivity (MCS). The COT reviewed the available literature on IEI in 1999 and in 2000. The current review examined the evidence regarding whether there is a plausible explanation for the occurrence of IEI and in particular whether there might be a toxicological explanation for IEI.