Few medicinal herbs are safter than turmeric, a potent antioxidant related to ginger. According to the U.S. National Institutes of Health, people living in India consume an average of 2 to 2.5 grams of turmeric each day with no known ill effects. Nevertheless, turmeric supplements may pose a risk to certain vulnerable populations. Because of the possibility of serious adverse reactions, young children, pregnant women, people with serious medical conditions and those taking medications should not take turmeric without consulting a qualified health care provider.
Upset Stomach
High doses of turmeric can cause indigestion. The University of Maryland Medical Center states that extremely high doses of turmeric may contribute to the development of ulcers; this side effect is generally seen only in people taking large amounts for extended periods of time.
Reduced Blood Sugar
People taking turmeric may experience a slight decrease in blood glucose levels. The National Institutes of Health advise caution in people taking turmeric alongside other drugs or supplements that lower blood sugar.
Pregnancy Risk
Women in India have historically consumed turmeric during all stages of life, including pregnancy and lactation. The amount of turmeric used in food is considered safe for pregnant women; however, the National Institutes of Health note that large amounts of the herb can stimulate uterine contractions. Tell your obstetrician or midwife before taking turmeric supplements during pregnancy.
Drug Interactions
Some limited studies have demonstrated that turmeric has a mild anti-coagulant effect. Because of this, people taking blood-thinners like wafarin (Coumadin) should avoid turmeric supplements. Additionally, the University of Maryland Medical Center notes that turmeric may interact with antacid drugs like Esomeprazole (Nexium) and Cimetidine (Tagamet).
