Who should not take turmeric?

Yes, turmeric and curcumin supplements have caused documented liver injury in real cases, most often in women, and that's the clearest reason several groups have to be cautious. Anyone with a history of liver problems, anyone on a blood thinner, anyone pregnant or breastfeeding, and anyone taking other medication regularly all have a specific, documented reason to talk to a doctor before starting turmeric or curcumin — not a general caution repeated out of habit.

A history of liver problems, or any liver-processed medication

This is the most concrete caution on this page. A 2024 case report describes a 35-year-old woman with no prior liver disease who developed jaundice and severely elevated liver enzymes (ALT over 2,200 U/L) after taking an over-the-counter turmeric supplement — specifically one combining 60 mg of curcumin with 10 mg of black pepper, twice daily, for two months. Genetic testing found she carried HLA B*35:01, a marker researchers have linked to this kind of drug- and supplement-induced liver injury. Her liver enzymes returned to normal within three months of stopping the supplement. A separate 2024 pathology review identified 11 people whose liver injury was attributed to turmeric supplements — 10 of them women, median age 58 — all of whom recovered after stopping. Neither case involved a person diagnosed with liver disease beforehand; this is a reaction that showed up in people without a known prior liver problem, which is exactly why it's worth taking seriously rather than assuming it only applies to someone already at risk. If you do have existing liver disease, or take a medication that's processed by the liver, that's an additional, more specific reason to ask a doctor before adding turmeric or curcumin at all.

Piperine-containing (black pepper) products, specifically

The case above involved a product combining curcumin with black pepper, which is added to many turmeric supplements specifically to increase absorption — a 1998 study found piperine raises curcumin's bioavailability by as much as 2000%. More curcumin reaching the body at once is the entire point of that pairing, and it's also a reasonable basis for extra caution: a product without piperine may behave differently than one that concentrates more curcumin into the bloodstream. See when is the best time to take turmeric? for more on that pairing.

Blood thinners, or before surgery

Curcumin has documented antiplatelet activity in laboratory and mechanistic research — meaning it affects how platelets clump together, part of the body's clotting process. That's not the same as a human trial showing a bleeding problem, but it's a real, published mechanism, which is why turmeric and curcumin are commonly flagged in supplement-interaction guides for anyone on a blood thinner or scheduled for surgery. See turmeric and medications: what to check for more detail.

Pregnant or breastfeeding

If you're pregnant or breastfeeding, talk to a doctor before using turmeric or curcumin supplements in any concentrated form. This is caution copy, not a specific research finding either way — none of the trials or case reports above enrolled pregnant or breastfeeding people, so there's no dosing or safety data for this group to draw on.

Anyone taking other medication regularly

If you take a prescription medication of any kind, ask a doctor before adding a concentrated turmeric or curcumin supplement, especially one that includes black pepper or another absorption enhancer. Neither the joint-symptom trials nor the liver injury case reports above tested turmeric against a broad range of medications, so an unstudied combination is the norm rather than the exception here.

Children

No dosing research exists for children. This page doesn't offer a children's amount because none has been established.

Questions people ask

Does turmeric cause liver damage?

In documented cases, yes. It isn't common relative to how widely turmeric supplements are used, but case reports and case series have identified specific people whose liver injury was attributed to turmeric or curcumin supplements, most of them women, and it's named among the more frequently implicated supplement ingredients in broader liver-injury data. See turmeric side effects for more.

Is turmeric bad for kidneys?

The documented safety signal for turmeric and curcumin supplements is specifically about the liver, not the kidneys — there isn't a comparable body of kidney-injury case reports to point to. That's an absence of evidence, not a clean bill of health; anyone with kidney disease should still ask a doctor before adding any new supplement.

Who should avoid turmeric completely?

Nobody is flatly ruled out by the research here, but a history of liver problems, current use of a blood thinner, pregnancy or breastfeeding, and regular use of any other medication are all specific reasons to talk to a doctor first rather than starting on your own.

Related reading: turmeric side effects, turmeric and medications: what to check, and how much turmeric should you take a day?.