Supplements
Turmeric and your liver in the UK: the two blood tests to check
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed September 20266 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
QUICK ANSWER
The UK Committee on Toxicity found reasonable evidence that turmeric supplements can harm the liver in a small number of people. The injury is rare, usually starts one to four months in, and shows on an ALT blood test before you feel it. Curcumin does lower CRP in trials, but only by about half a milligram per litre.
Find the panel that reads your liver →As of September 2026. Turmeric is back in the news. At the EASL Congress in May 2026, Europe's liver specialists flagged herbal supplements as a rising cause of serious liver injury, with turmeric named among them.
You probably take it for your joints, or because a podcast called it anti-inflammatory. Both claims lead to a blood test. One test tells you whether the capsules are bothering your liver. The other tells you whether the anti-inflammatory story shows up in your own blood.
1. What is the turmeric liver warning about?
A rare, unpredictable reaction. Not an overdose.
The Committee on Toxicity advises the UK Food Standards Agency. In 2024 it reviewed the case reports on turmeric and curcumin supplements. Its conclusion is restated in a July 2026 discussion paper on herb-induced liver injury.
“There was reasonable evidence for a link to turmeric consumption because the effects occurred upon challenge and were reversed after withdrawal.”
Committee on Toxicity, restated in the July 2026 paper on herb-induced liver injury
“Upon challenge” means people got ill on the supplement, recovered when they stopped, and in some cases got ill again on restarting. The same paper adds that the person “may not know they are susceptible before taking a supplement”. One gene variant, HLA-B*35:01, keeps turning up in the cases.
The NIH LiverTox database, the reference catalogue for supplement liver harm, now rates turmeric a category A cause of liver injury. That is its top score, and the entry was updated in June 2025. Three details from it matter for anyone taking the capsules.
- It takes a while. Injury typically starts one to four months after the first capsule, and as late as eight months. That delay is why people rarely connect the two.
- The absorption boosters are part of the story. Plain curcumin is poorly absorbed, so many products add piperine from black pepper. LiverTox links these high-absorption forms to several of the cases. Coverage of EASL 2026 put the boost at up to twenty times.
- It usually reverses. Most cases settle within one to three months of stopping. Rarely, it does not, and acute liver failure has been reported.
The United States Pharmacopeia reviewed the same cases in 2026 and now recommends a label warning. Its wording is worth having in full: “Liver problems have been reported very rarely in people taking supplements containing turmeric and/or curcuminoids.” Very rarely is the honest phrase. Our guide to herbal supplements and the liver covers green tea extract and ashwagandha, which sit on the same list.
2. Does curcumin actually lower CRP?
Yes, a little. The size of the little is the point.
CRP is C-reactive protein, a protein your liver releases when something inflammatory is going on anywhere in the body. It is the routine inflammation marker, and the one the anti-inflammatory claim would have to move.
A 2023 meta-analysis in the journal Cytokine pooled 66 randomised trials. Turmeric or curcumin lowered CRP by 0.58 mg/L on average against placebo. That is real, and it is small. The range most UK labs use for a normal CRP is several times wider than that, as our normal CRP levels guide sets out.
Bigger falls come from sicker people. An earlier meta-analysis in Phytotherapy Research looked only at trials in people with inflammatory conditions and found a drop of 3.67 mg/L. Those participants started high. If your CRP is already low, there is not much for a capsule to lower.
Two more cautions. A lower number on a lab report is not the same as a benefit you would feel, and no supplement sold in the UK may claim to treat or prevent anything. If aching joints are what sent you to the turmeric aisle, our guide on glucosamine and joint pain explains why CRP is often normal in wear-and-tear arthritis anyway.
3. Which two blood tests are worth checking?
One for the risk, one for the claim. Both are routine markers, and both are cheap.
- ALT, for the risk. ALT is an enzyme held inside liver cells. It leaks into the blood when those cells are under strain, so it rises early, usually before any symptom. The turmeric cases mostly show this pattern. Our ALT guide explains the range and what a mild rise usually means.
- ALP, alongside it. Alkaline phosphatase is a second liver enzyme, tied to the bile ducts. Reading the two together tells a clinician which part of the liver is complaining. See the ALP guide.
- CRP, for the claim. If you are taking turmeric for inflammation, the only way to know it did anything is a CRP before and a CRP after. Our CRP blood test guide covers how it is read.
Helvy's Thyroid & Vital Organs panel (£159) carries ALT and ALP, with albumin and total protein, from a home finger-prick sample. CRP sits on the General Energy & Wellness panel (£149). The liver function test guide walks through each marker, and the energy and fatigue hub covers the tiredness that often sends people to a supplement shelf in the first place.
A blood test measures biomarkers and offers wellness insight. It does not diagnose liver disease. One mildly raised ALT is common, often means nothing, and needs a qualified clinician to read it in context. Helvy does not sell turmeric or curcumin.
4. When should you recheck, and when should you stop?
Baseline first, recheck around the three-month mark, stop at the first symptom. In that order.
- Before the first capsule. An ALT and a CRP taken now are the only numbers a later result can be compared with.
- Around three months in. That is the middle of the one-to-four-month window in which the reported cases began.
- One thing at a time. If turmeric goes in with a new fat-loss stack or a liver detox blend, a change in your bloods has no clear owner.
- Label dose, and skip the boosters. The high-absorption formulas are the ones the case reports keep naming.
Stop the capsules and see a doctor promptly if you notice yellowing of the skin or eyes, dark urine, pale stools, itching, or pain under the right ribs. The NHS lists these as the signs of a liver under strain. Do not wait for a test. Suspected reactions can be reported through the MHRA Yellow Card scheme.
If you have a history of liver problems, the USP advice is to speak to a clinician before starting at all. Heavy drinking and medicines that load the liver deserve the same conversation. It is a smaller ask than it sounds.
READY TO TEST?
Start with the organ that has to process it
ALT and ALP sit on one home finger-prick panel. CRP sits on another. The quiz will tell you which one fits your question. Results in around 5 working days from UKAS-accredited UK laboratories.
Frequently asked questions
Is turmeric bad for your liver?
For most people, no. For a small number it triggers a rare, unpredictable liver reaction. The UK Committee on Toxicity found reasonable evidence for the link, and the NIH LiverTox database rates turmeric a well-documented cause of liver injury. Cooking with it is not the concern. Concentrated supplements are.
How long does turmeric take to affect the liver?
In the reported cases, one to four months was typical, with a range from a few weeks to eight months. Most cases settled within one to three months of stopping the supplement.
Does black pepper make turmeric more dangerous?
Piperine, the black pepper extract, is added to many products to boost absorption of curcumin. LiverTox links these high-absorption forms to several of the reported liver injury cases. Coverage of EASL 2026 put the absorption boost at up to twenty-fold.
Does turmeric lower CRP?
Trials say yes, by about 0.58 mg/L on average across 66 randomised studies. Larger falls were seen in people with inflammatory conditions who started high. A lower lab number is not the same as a benefit you would notice.
Which blood test shows turmeric liver damage?
ALT is the early marker, because it leaks from liver cells under strain before any symptom appears. ALP is read alongside it. Both sit on Helvy's Thyroid & Vital Organs panel. A blood test measures these markers; it does not diagnose liver disease, and a qualified clinician should read the result.
Related guides
Herbal Supplements and Liver Damage UK
Green tea extract, ashwagandha and turmeric: who is at risk.
ALT Blood Test UK
The single most useful first look at your liver.
CRP Blood Test UK
The routine inflammation marker, and how it is read.
Glutathione Supplements UK
Another capsule sold for the liver, and what the trial showed.