Hangovers are not simply the result of the toxins in alcoholic drinks. A major contributor to the headache and general lethargy is dehydration. If this water is not supplied, the body will take it from elsewhere in the system, leading to dehydration and a hangover. The best prevention for a hangover is to maintain non-alcoholic fluid levels before, during and after drinking alcohol to provide the liver with the water it needs to process the alcohol in the system. They usually have a bitter taste and are characterised by powerful physiological activity.
Examples are nicotine and caffeine.
Antioxidant - A compound which prevents oxidation. Caffeine - An alkaloid found in tea and coffee which acts as a nerve stimulant and diuretic. Catechins - A group of related polyphenolic compounds which occur in plants and are darkened by the action of certain plant enzymes and oxygen an example of browning of cut fruit and vegetables. Catechins can function as antioxidants. Cardiovascular - concerning the heart and blood vessels.