Ginger for nausea and vomiting in pregnancy: randomized, double-masked, placebo-controlled trial.

Objective: To determine the effectiveness of ginger for the treatment of nausea and vomiting of pregnancy.

Methods: Women with nausea and vomiting of pregnancy, who first attended an antenatal clinic at or before 17 weeks' gestation, were invited to participate in the study. During a 5-month period, 70 eligible women gave consent and were randomized in a double-masked design to receive either oral ginger 1 g per day or an identical placebo for 4 days.