Turmeric is likely safe when taken by mouth or applied to the skin appropriately for up to 8 months.
Turmeric usually does not cause significant side effects; however, some people can experience stomach upset, nausea, dizziness, or diarrhea.
In one report, a person who took very high amounts of turmeric, over 1500 mg twice daily, experienced a dangerous abnormal heart rhythm. However, it is unclear if turmeric was the actual cause of this side effect. Until more is known, avoid taking excessively large doses of turmeric.
Special Precautions & Warnings:
Pregnancy and breast-feeding: During pregnancy and while breast-feeding, turmeric is likely safe when taken by mouth in amounts commonly found in food. However, turmeric is likely unsafe when taken by mouth in medicinal amounts during pregnancy. It might promote a menstrual period or stimulate the uterus, putting the pregnancy at risk. Do not take medicinal amounts of turmeric if you are pregnant. There is not enough information to rate the safety of medicinal amounts of turmeric during breast-feeding. It is best not to use it.
Gallbladder problems: Turmeric can make gallbladder problems worse. Do not use turmeric if you have gallstones or a bile duct obstruction.
Bleeding problems: Taking turmeric might slow blood clotting. This might increase the risk of bruising and bleeding in people with bleeding disorders.
Diabetes: Curcumin, a chemical in turmeric, might decrease blood sugar in people with diabetes. Use with caution in people with diabetes as it might make blood sugar too low.
A stomach disorder called gastroesophageal reflux disease (GERD): Turmeric can cause stomach upset in some people. It might make stomach problems such as GERD worse. Do not take turmeric if it worsens symptoms of GERD.
Hormone-sensitive condition such as breast cancer, uterine cancer, ovarian cancer, endometriosis or uterine fibroids: Turmeric contains a chemical called curcumin, which might act like the hormone estrogen. In theory, turmeric might make hormone-sensitive conditions worse. However, some research shows that turmeric reduces the effects of estrogen in some hormone-sensitive cancer cells. Therefore, turmeric might have beneficial effects on hormone-sensitive conditions. Until more is known, use cautiously if you have a condition that might be made worse by exposure to hormones.
Infertility: Turmeric might lower testosterone levels and decrease sperm movement when taken by mouth by men. This might reduce fertility. Turmeric should be used cautiously by people trying to have a baby.
Irondeficiency: Taking high amounts of turmeric might prevent the absorption of iron. Turmeric should be used with caution in people with iron deficiency.
Surgery: Turmeric might slow blood clotting. It might cause extra bleeding during and after surgery. Stop using turmeric at least 2 weeks prior to a scheduled surgery.