For the same reason aspirin should be avoided in pregnancy, chamomile has such powerful anti-inflammatory properties that regular consumption may result in a serious fetal heart problem—premature constriction of the fetal ductus arteriosus, which allows the fetus to “breathe” in the womb.
Chamomile Tea May Not Be Safe During Pregnancy
Doctor's Note
For more on chamomile tea, see Red Tea, Honeybush, & Chamomile, and The Healthiest Herbal Tea. For other cautionary pregnancy tales, see What About the Caffeine?; Is Licorice Good For You?; Iron During Pregnancy; Maternal Mercury Levels; Pregnant Vegans at Risk for Iodine Deficiency; American Vegans Placing Babies at Risk; and Chicken Consumption and the Feminization of Male Genitalia. Another common herbal tea that may have a potential downside is yerba maté (Update on Yerba Maté). The best beverage during pregnancy is water.
For more context, check out my associated blog posts: The Most Anti-Inflammatory Mushroom; Treating PMS with Saffron; and Hibiscus Tea: The Best Beverage?
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