Ginger. I prefer the pickled sushi ginger, but any type will do cookies, crystallized, tea, tablets - take your pick.
'The present study showed that ginger at a dose of 1,000 mg effectively reduced the severity of nausea evoked by circular vection, prolonging latency before the onset of nausea and shortening the recovery time from nausea after the cessation of vection.'
Effects of ginger on motion sickness and gastric slow-wave dysrhythmias induced by circular vection
Han-Chung Lien , Wei Ming Sun , Yen-Hsueh Chen , Hyerang Kim , William Hasler , Chung Owyang
American Journal of Physiology - Gastrointestinal and Liver PhysiologyPublished 1 March 2003
'The present study showed that ginger at a dose of 1,000 mg effectively reduced the severity of nausea evoked by circular vection, prolonging latency before the onset of nausea and shortening the recovery time from nausea after the cessation of vection.'
Effects of ginger on motion sickness and gastric slow-wave dysrhythmias induced by circular vection Han-Chung Lien , Wei Ming Sun , Yen-Hsueh Chen , Hyerang Kim , William Hasler , Chung Owyang American Journal of Physiology - Gastrointestinal and Liver PhysiologyPublished 1 March 2003
http://ajpgi.physiology.org/content/284/3/G481