There are not many reviews about the effects of quality of alcohol, and the available reviews are all linked to unrecorded alcohol [12;227-229] for a definition of unrecorded see [229;230]. Despite evidence of methanol poisoning outbreaks and some problems with potentially harmful levels of other ingredients such as acetaldehyde [231], ethyl carbamate [232] and coumarin [230], overall there is no evidence of a large impact of unrecorded consumption over and above the effects of alcohol, per se [11;229]. However, even though research activity has increased in recent years, mainly in countries of the ex-Soviet Union and in Africa, there are still too few systematic large-scale investigations of quality of alcohol in different parts of the world to conclude definitively that quality of alcohol does or does not have a significant impact on health.
