Guide
Turmeric side effects
Most side-effect data on concentrated curcumin extract shows mild, non-dose-related effects even at very high single doses. Separately, a small but real and documented pattern of liver injury has been reported from turmeric and curcumin supplements, most often in women.
Most of what's documented about turmeric and curcumin's side effects is mild: gastrointestinal discomfort, and generally good tolerability even at very high single doses in short trials. Separately, and worth taking seriously, is a real and growing pattern of liver injury reported from turmeric and curcumin supplements — documented in case reports and case series, not a rumor, and it hasn't shown up at the extreme doses used in short safety trials so much as at ordinary supplement amounts over weeks to months.
Mild, dose-related effects
A 2006 dose-escalation study gave 24 healthy volunteers single oral doses of a standardized curcumin extract from 500 mg up to 12,000 mg. Only 7 of the 24 people experienced any toxicity, described by the researchers as minimal and not related to how high the dose was. In a 2014 four-week trial of 1,500 mg/day curcumin extract in 367 people with knee osteoarthritis, the side effects reported were mostly mild abdominal discomfort. Across both studies, the pattern is mild gastrointestinal effects rather than anything more serious, at least in the short term these trials measured.
A documented liver injury signal
A 2024 review of herbal and dietary supplement-related liver injury reported that supplements now account for roughly 20% of drug-induced liver injury cases tracked by a major US research network — and named turmeric among the ingredients most frequently implicated. A separate 2024 pathology review went further, identifying 11 specific patients whose liver injury was clinically attributed to turmeric supplements: 10 of the 11 were women, the median age was 58, and presentations ranged from abnormal blood tests with no symptoms to jaundice. Liver biopsies most often showed an acute injury pattern; all 11 patients recovered, with liver function tests returning to normal after they stopped the supplement, and 4 also received steroid treatment. This isn't a description of turmeric the spice used in cooking — it's specifically about concentrated turmeric and curcumin supplements, generally taken over weeks to months rather than as a one-time high dose. See who should not take turmeric for a specific case with a stated dose and a genetic risk marker.
Why this doesn't line up with the dose-escalation data
It's worth being direct about something that looks contradictory: the 2006 safety study found single doses up to 12,000 mg well tolerated, while the liver injury cases involved much lower daily amounts taken repeatedly. These aren't measuring the same thing. A single high dose tested for a few hours or days doesn't rule out an uncommon reaction that only shows up after weeks of regular use, and doesn't test for it the way a case series or long-term safety monitoring would. Neither type of study on its own gives a complete safety picture.
Allergy
Turmeric is in the ginger family. Anyone with a known allergy to ginger or related plants has a reasonable basis for caution with turmeric, though this isn't backed by a dedicated turmeric-allergy trial — it's a general cross-reactivity consideration.
Questions people ask
What are the side effects of turmeric?
The best-documented mild effects are gastrointestinal — stomach upset or discomfort — generally at higher doses. Separately, and more seriously, liver injury has been documented in case reports and case series linked to turmeric and curcumin supplements; see the section above.
Can turmeric cause liver damage?
Yes, in documented cases. It's not a common outcome relative to how widely turmeric supplements are used, but it's a real, recorded pattern rather than a theoretical concern — case series have identified specific patients whose liver injury was attributed to turmeric supplements, and it's named as a frequently implicated ingredient in broader supplement-related liver injury data. See who should not take turmeric for who has more reason to be cautious.
Does turmeric have side effects when taken daily?
The liver injury cases documented above generally involved daily or twice-daily use over weeks to months, which is different from the short, high single-dose safety studies that found good tolerability. That's a reason to treat "well tolerated in a trial" and "safe to take every day indefinitely" as two separate questions.
Related reading: who should not take turmeric, turmeric and medications: what to check, and how much turmeric should you take a day?.
Sources
- Dose escalation of a curcuminoid formulation A 2006 study gave healthy volunteers single doses of a standardized curcumin extract ranging from 500 mg to 12,000 mg. Side effects were minimal and not related to dose, but curcumin was barely detectable in the blood even at the highest doses — confirming how poorly it absorbs regardless of how much is taken.
- Efficacy and safety of Curcuma domestica extracts compared with ibuprofen in patients with knee osteoarthritis: a multicenter study A 4-week trial of 1,500 mg/day Curcuma domestica extract in 367 people with diagnosed knee osteoarthritis, run against an active drug comparator; it tested the extract in a supervised clinical setting, not as a replacement for medical care.
- Turmeric supplement-associated hepatitis: a clinicopathological series of 11 cases highlighting pan-lobular and zone 3 injury A 2024 pathology review identified 11 people — 10 of them women, median age 58 — whose liver injury was attributed to turmeric supplements; all recovered and their liver enzymes normalized after they stopped taking it.
- Challenges in herbal-induced liver injury identification and prevention A 2024 review reported that herbal and dietary supplements now account for about 20% of drug-induced liver injury cases tracked by a US research network, and named turmeric among the most frequently implicated supplement ingredients.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.