evidence: Claim: Red Bull energy drink contains a banned, government-manufactured stimulant linked to the formation of brain tumors. [...] Red Bull is the trendy drink of the moment among the dance club set. It is also expensive, and this carbonated nectar is sickly sweet. As for the second of the claims that needed to be addressed, Red Bull does contain glucuronolactone. But as we've seen, that ingredient is apparently innocuous.