Gallbladder and kidney problems
Curcumin can cause the gallbladder to contract and increase the production of bile which is used to break down fats in digestion. However, if you have gallstones, you should avoid taking turmeric supplements. Gallstones can block the passage of bile so producing extra will mean it could build up and cause problems.
People who are known to form kidney stones should be cautious when taking regular doses of turmeric. Turmeric is thought to increase levels of a compound called oxalate, which in people with already high levels may cause kidney stones to form. Oxalate is normally excreted in our urine and lots of foods contain high levels including spinach, potatoes, beetroot and many others. There is research that suggests people with a tendency to form kidney stones should consume calcium at the same time as foods high in oxalate, as calcium binds to it and the body is able to excrete it. For anyone concerned the University of Chicago has a great article that explains in more detail http://kidneystones.uchicago.edu/how-to-eat-a-low-oxalate-diet/
Gastrointestinal side effects and antacid drug interactions
Antacid medications are prescribed to reduce the amount of acid the stomach produces. They’re used in people that suffer from heartburn and acid reflux problems. Concentrated forms of turmeric may interfere with the action of these drugs, therefore increasing the amount of stomach acid produced. It’s therefore recommended that you do not take turmeric or curcumin supplements if you’re taking these types of medications.
BUT what if some side effects that were not good for people on certain medications were actually beneficial to those of us not taking these medications? Could we have one group who needed to avoid turmeric supplements, and another actually benefitting from the same side effects? Turns out, quite possibly, yes…