Ginger (Sheng Jiang) is an effective remedy for nausea and vomiting during pregnancy. A single blind clinical trial carried out in Iran randomly assigned 67 pregnant women to receive either 1000 mg ginger in capsules or placebo capsules for four days. Ginger users demonstrated a higher rate of nausea improvement than placebo users (85% versus 56%). The decrease in vomiting among ginger users was also significantly greater than among women who received the placebo (50% vs. 9%). (Effects of ginger capsules on pregnancy, nausea and vomiting. J Altern Complement Med. 2009 Mar;15(3):243-6)
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