Turmeric / curcumin

No UL has been set. We use a cited reference upper value of 9,000 mg per day. It comes from the linked study or assessment and is not a regulatory limit. [source]

As of 2026-11-01, 1,258 products list a comparable daily dose (1,550 dose records; one product can have several). The median is 150 mg per day, and 90% of records fall between 10 and 1,000 mg. Figures come from labels and are not lab-tested. [source]

Curcumin is poorly absorbed and quickly metabolised, so blood levels stay low; piperine slows its metabolism. The US NCCIH states there is no strong evidence that turmeric helps any health condition; case reports have linked it to liver injury. [source]

Oral turmeric can cause nausea and vomiting, acid reflux, stomach upset, diarrhea or constipation. Topical curcumin can cause hives or itching. (Source: NCCIH) [source]

Conventional oral turmeric or curcumin (not enhanced for bioavailability) is likely safe at recommended amounts for up to 2–3 months. Liver damage has been reported with high-bioavailability curcumin products; if you notice fatigue, nausea, poor appetite, dark urine or jaundice, stop at once and see your provider. (Source: NCCIH) [source]

Turmeric supplements may be unsafe in pregnancy. Little is known about the safety of more than food amounts while breastfeeding. (Source: NCCIH) [source]

NCCIH advises talking with your provider before using any herbal product if you take any medicine, because some herbs and medicines interact in harmful ways. (Source: NCCIH) [source]

Curcumin products vary widely in actual content and often add piperine from black pepper to improve absorption. Note that high-bioavailability formulas have been linked to liver injury reports. (Source: NCCIH) [source]