Marley's Mellow Mood contains valerian root and chamomile and is promoted to reduce stress.
The drink's nutrition facts say it may cause drowsiness and isn't intended for children.
However, students at Satz Middle School and Holmdel High School could buy it on campus. Several middle school students were sickened Friday.
The Asbury Park Press ( http://on.app.com/11OWGro) reports the school's food service provider has removed a manager pending an investigation. Chartwells School Dining Services also removed the Marley product from other schools.
The company said it is taking the situation seriously.
Students who consumed the drink complained of lethargy, headaches, nausea and elevated heart rates. Officials are trying to determine how many students were sickened.
Information from: Asbury Park (N.J.) Press, http://www.app.com