But, they note, the study does not prove the supplements cause the increase.
Lead can be passed through a woman's body to developing fetuses or breast-feeding infants.
The study was published in the "Journal of General Internal Medicine."
Herbal supplements may cause lead level rise
LOS ANGELES Researchers looked at women of reproductive age and found that those who had taken such supplements as ayurvedic or St. John's wort had elevated lead levels.
