Turmeric Curcumin
Turmeric comes from the underground stem of Curcuma longa, a member of the ginger family. Curcumin is its main yellow compound, alongside related curcuminoids.
Also listed as Turmeric Root Extract 30:1, Turmeric extract, Curry Extract, Curcuma
Studied doses are not a universal schedule
The four-week cognition trial used 400 mg daily of a solid-lipid preparation, not 400 mg of pure curcumin. The 18-month memory trial used 90 mg curcumin twice daily in another formulation. These are study descriptions, not equivalent doses or recommendations for self-treatment. 1 2
What does the European safety benchmark mean?
The BfR cites an acceptable daily intake of 3 mg curcumin per kilogram of body weight from all sources. This is a long-term safety benchmark, not a target dose for joint pain. The BfR also cautions that enhanced absorption complicates safety assessment; staying below that number does not guarantee that every formulation is safe. 3
Stomach symptoms and liver warning signs
Oral turmeric can cause nausea, reflux, diarrhea, constipation or stomach upset. NCCIH lists fatigue, poor appetite, dark urine and jaundice among possible signs of liver injury and advises stopping the product and contacting a clinician if they occur. Its reassurance about conventional preparations covers recommended amounts for about two to three months, not unrestricted long-term use. 4
Who needs particular caution?
The Verbraucherzentrale advises against concentrated turmeric supplements in pregnancy, breastfeeding and gallstone disease. Extracts can stimulate bile flow, potentially provoking colic in people with gallstones. Possible medicine interactions, especially with piperine-containing products, are a reason to discuss the exact formulation with a healthcare professional. 5
For information, not individual medical advice. Ingredient studies do not establish the effectiveness of these products.