Vial of Serum (Japanese: けっせい Serum) is a medicine item in Earthbound which works as an antidote for the poison status ailment on party members. It can be purchased in Scaraba (Hassan's Shop and Red Snake's Shop) and Threed (Drugstore ) for $58.00. Vial of Serum can be dropped by Skelpions in Dusty Dunes Desert, and although it is quite rare it is convenient as Skelpions have a high rate of poisoning party members. It is the only known medicine in Earthbound to primarily cure poison, making it equivalent to the Antidote in Mother and Mother 3.