It claims it can prevent hangovers.
"The primary cause of a hangover is congeners. ---- Our natural ingredients prevent hangover by attracting and absorbing congeners using activated calcium carbonate and charcoal. You can completely counteract the negative effects of alcohol abuse.
Chaser does not prevent intoxication or absorb alcohol. We recommend that you drink in moderation and drink responsibly. Two caplets last for three hours of drinking, or for up to six drinks. If you drink over a longer period, or more than six drinks, take two more caplets.
http://www.doublechaser.com/
"The primary cause of a hangover is congeners. ---- Our natural ingredients prevent hangover by attracting and absorbing congeners using activated calcium carbonate and charcoal. You can completely counteract the negative effects of alcohol abuse.
Chaser does not prevent intoxication or absorb alcohol. We recommend that you drink in moderation and drink responsibly. Two caplets last for three hours of drinking, or for up to six drinks. If you drink over a longer period, or more than six drinks, take two more caplets.
http://www.doublechaser.com/