An inexpensive dietary supplement appears to help prevent the serious pregnancy complication preeclampsia in high-risk women, according to a new study.

But researchers say the effect in lower-risk pregnancies remains to be determined.

In the study from Mexico, women who ate daily food bars containing the amino acid L-arginine and antioxidant vitamins during pregnancy had a much lower incidence of preeclampsia than women who ate bars containing the antioxidant vitamins alone or bars containing neither supplement

via Dietary Supplement May Help Prevent Preeclampsia.