Supplements That Can Cause Liver Damage: The List and Warning Signs

Fact checked by Rebecca Thornton, M.S., Food Science and Human Nutrition

You take a multivitamin. Maybe also a turmeric capsule, a green tea "metabolism" blend, or something to help you sleep. Then you hear that a supplement hurt someone's liver, and you start looking at your own shelf.

Here's the honest picture. Most supplements taken at label doses don't cause liver problems. But a short list of ingredients keeps showing up in U.S. liver research. Herbal and dietary supplements now account for about 1 in 5 cases of drug-induced liver injury that researchers track in the United States [1].

This matters more with age. About 80% of women and 67% of men age 60 and older take a supplement, and about 1 in 4 people in that age group take four or more [2].

This guide gives you the list of supplements that cause liver damage, ranked by how strong the evidence is. You'll also learn when problems usually show up, the early warning signs, and how to build a routine that is easier on your liver.

Can Supplements Damage Your Liver?

Yes, but it's uncommon. When it happens, doctors call it drug-induced liver injury, or DILI, even when the cause is an herb or a vitamin.

Most cases fall into one of two groups:

• Too much of one thing. A few nutrients, like vitamin A and high-dose niacin, strain the liver once the dose gets high enough or stays high long enough [3, 4].
• A bad match with your body. Some herbs, like green tea extract and turmeric, cause rare reactions that look immune-driven. They are tied to a specific immune gene, which helps explain why one person reacts and thousands of others don't [5, 6].

Before a doctor blames a supplement, they rule out other causes first [7]. Many also use a scoring tool called RUCAM to judge how likely a product is to be the cause [8].

Which Supplements Cause Liver Damage? The List, Ranked by Evidence

The supplements most often linked to liver damage are green tea extract, turmeric or curcumin, kava, black cohosh, high-dose vitamin A, sustained-release niacin, ashwagandha, bodybuilding products with hidden steroids, and older weight-loss blends that contained usnic acid. Products with many ingredients are the most common source overall [1].

The table below uses ratings from LiverTox, the National Institutes of Health (NIH) database on liver injury from drugs and supplements. An "A" means the link is well established. "B" means likely. "D" means possible but rare.

One thing this table does not tell you is how often a reaction happens. The letter grade shows how sure researchers are that the link is real. Kava is rated A, yet LiverTox estimates fewer than 1 case per 1 million daily doses [10]. Turmeric is also rated A, at roughly 1 in 10,000 to 1 in 100,000 people who take it [9]. So "well established" means "real," not "common."

Multi-ingredient products deserve their own mention. Most supplement-related liver cases in the U.S. involve products with many ingredients, and the exact culprit is often never found [1].

Why Does One Person React When Thousands Don't?

Three things shift your personal risk.

1. The dose, and how long you take it

Vitamin A and niacin are the clearest examples. The more you take and the longer you take it, the higher the risk [3, 4]. This kind of risk is predictable, which also makes it the easiest to avoid.

2. Your genes

Green tea extract and turmeric reactions are closely tied to an immune gene variant called HLA-B*35:01 [5, 6]. In a U.S. series of 10 turmeric cases, 7 people carried it, a far higher rate than in the general population [6]. There's no simple home test for this. The practical takeaway is to know the timing and the warning signs, especially in the first few months.

3. How the product is made and taken

Some formulas are designed to push more of an ingredient into your blood. In one study, adding 20 mg of piperine (black pepper extract) to 2 grams of curcumin raised curcumin absorption by 2,000% in healthy adults [21]. Taking a green tea catechin supplement on an empty stomach raised peak blood levels of free EGCG more than 3.5 times compared with taking it with food [22].

These features are usually sold as a plus. For your liver, more absorption also means more exposure.

How Your Liver Handles Supplements, in Plain Language

Think of your liver as your body's chemistry lab. For most medicines, it does more of the processing than any other organ [23], and it handles herbs and vitamins too. The work happens in two big steps:

• Step 1: make it movable. Enzymes add or clip small chemical tags. Sometimes this creates short-lived byproducts that can irritate liver cells.
• Step 2: make it removable. Other enzymes attach larger tags so the compound dissolves in water and can leave through bile or urine.

Most of the time this runs smoothly. The load goes up when doses are high, when an extract packs far more than food would, when several products arrive at once, or when alcohol is in the mix. Age also plays a role. Changes in the aging liver are a big reason older adults respond to medicines less predictably [23].

A Closer Look at the Biggest Names

Is green tea bad for your liver?

Brewed green tea has a strong safety record. The concern is concentrated extract. LiverTox reports that drinking green tea hasn't been linked to liver injury in general, though rare cases have involved very large amounts [5]. Most cases of green tea extract liver damage involve capsules and powders.

The numbers show why. A typical tea drinker gets about 90 to 300 mg of EGCG a day. Supplements can deliver anywhere from 5 to 1,000 mg a day [24]. In clinical trials, 800 mg or more of EGCG a day from supplements raised liver enzymes compared with control groups [24].

Timing matters too. An empty stomach pushes blood levels much higher [22]. Taking an extract before breakfast, as many fat-burner routines suggest, raises your exposure.

Is turmeric bad for your liver?

Liver injury from turmeric supplements is very rare, but it's real. LiverTox now rates turmeric as a well-established cause, at roughly 1 in 10,000 to 1 in 100,000 people who take it [9]. The U.S. cases studied involved turmeric supplements, not the spice in your cooking.

A U.S. study of 10 cases of turmeric liver damage found [6]:

• 8 of the 10 people were women, and the median age was 56.
• Most cases appeared 1 to 4 months after starting.
• Five people were hospitalized, and one died.
• Three of the seven products tested also contained black pepper extract (piperine).

If you like turmeric, using it in food, like our golden milk latte, is a different exposure from a high-absorption capsule.

Vitamin A: the label trap

"Vitamin A" on a label can mean two very different things:

• Preformed vitamin A (retinol), listed as retinyl palmitate or retinyl acetate. Your body stores it in the liver. The adult upper limit is 3,000 mcg RAE a day, which equals 10,000 IU [12].
• Beta-carotene, from plants. Your body converts it to vitamin A, and no upper limit has been set for it [12].

Liver injury from vitamin A is generally seen above about 40,000 IU a day. Long-term toxicity usually shows up after 3 months to many years of high intake [3]. It can reverse in its early stages, but recovery may be slow [3].

Try this 2-minute label math. If a label lists retinol in IU, multiply by 0.3 to get mcg RAE [12]. A 10,000 IU retinyl palmitate softgel equals 3,000 mcg RAE. That's the full adult upper limit in one pill, before your multivitamin, cod liver oil, or meals. One serving of beef liver alone has about 6,582 mcg RAE [12].

One caution about beta-carotene: if you smoke or used to, skip high-dose beta-carotene supplements. Two large trials found harmful effects in current and former smokers [12].

Niacin: the form matters more than the name

Niacin (vitamin B3) comes in different release forms, and that changes the liver risk a lot. In a 1994 trial, 46 adults took niacin at rising doses up to 3,000 mg a day. Twelve of 23 people (52%) on sustained-release niacin developed liver toxicity. None of the 23 on immediate-release niacin did [13].

A later review found that serious liver toxicity from niacin is mostly limited to slow-release forms sold as nutritional supplements [25]. At doses above 500 mg a day, any niacin can briefly raise liver enzymes in up to 1 in 5 people, usually without symptoms [4].

Sustained-release niacin is often labeled "slow-release" or "timed-release." It's not the same as prescription extended-release niacin, which LiverTox lists as lower risk [4]. Switching from regular niacin to a sustained-release form on your own can trigger a reaction within days to weeks [4]. At gram-level doses, niacin is medicine territory. Use it only with your clinician and regular blood work.

Is ashwagandha bad for your liver?

It's rare, but LiverTox rates ashwagandha as a likely cause of liver injury [14]. A case series from Iceland and the U.S. described five people who developed jaundice, nausea, tiredness, itching, and belly discomfort 2 to 12 weeks after starting ashwagandha products [15].

Itching and jaundice lasted 5 to 20 weeks. No one developed liver failure, and liver tests went back to normal within 1 to 5 months in the four people who were followed [15]. Four of the five were also taking other supplements, which is one more reason to add one product at a time [15].

Kava, black cohosh, and usnic acid

Kava has the longest regulatory history. The FDA warned consumers in 2002, and several countries, including Germany, Canada, and Great Britain, banned or restricted it. (Germany later lifted its ban.) Reported outcomes range from mild enzyme changes to liver transplant and death [10].

Black cohosh has been linked to more than 50 cases of liver injury, but researchers still debate how many were truly caused by it. Part of the problem is quality, since some products sold as black cohosh contained related Chinese plants [11].

Usnic acid came from lichen and was sold in weight-loss blends. A 2006 report in Mayo Clinic Proceedings described two people who developed severe liver injury within 3 months of taking one. One needed an emergency liver transplant [17].

Bodybuilding and "performance" products

In a large U.S. study, bodybuilding supplements caused 45 of the 130 supplement-related liver injury cases. They mostly affected young men and caused jaundice that lasted a median of 91 days [18]. Many of these products contain anabolic steroids sold as supplements. Those typically cause a long-lasting injury that slows bile flow but eventually clears up [1]. For more on how drugs end up in "supplements," read The Dangers of Hidden Ingredients in Supplements.

Reishi and other mushrooms

Reishi sits at the low end of the list. LiverTox rates it a "possible" rare cause and notes it hasn't raised liver enzymes in studies [19]. The two published cases most often cited involved people who had used boiled reishi without trouble, then switched to a powder and developed liver injury within 1 to 2 months. Both had also taken other remedies or medicines [20].

The honest summary: a reaction is possible but very rare. The same habits apply to mushrooms as to everything else on this page.

What Are the Early Signs of Liver Damage From Supplements?

The early signs of liver damage from supplements are easy to brush off. Watch for [15, 16]:

• Unusual tiredness
• Nausea or a poor appetite
• Itching without a rash
• Discomfort in the upper right side of your belly
• Dark, tea-colored urine or pale stools
• Yellowing of the whites of your eyes or your skin (jaundice)

The timing clue: in the research above, most reactions showed up within 1 to 6 months of starting a product, and sometimes within days of switching forms [4, 5, 6, 15]. A new symptom that started after a new supplement is worth a call.

Get care the same day if you notice yellow eyes or skin, very dark urine, or intense itching. Don't wait to see if it passes.

What to Do If You Think a Supplement Is Affecting Your Liver

The order of these steps matters, so here's the reason behind each one.

1. Stop the most likely suspect now. If you started several products in the last few months, pause all of them. Most reactions in the research appeared within that window.
2. Call your clinician. Go the same day if you have jaundice, dark urine, or intense itching. Liver injury from supplements can turn serious, so speed matters [7].
3. Bring the bottles, not a list. Labels show the exact form and dose, like retinyl palmitate or sustained-release niacin. With multi-ingredient products, the label is often the only way to narrow down a culprit [1].
4. Ask about a liver panel. Common tests include ALT, AST, alkaline phosphatase, and bilirubin. Your clinician will also check for other causes before blaming a supplement [7].
5. Give your liver less to do. Skip alcohol, don't add anything new, and ask before taking acetaminophen or other medicines.
6. Don't restart it "to test it." Taking the same product again can bring the injury back faster. For niacin, LiverTox says plainly that it should be avoided [4, 5].
7. Expect weeks to months, not days. In the ashwagandha cases, liver tests took 1 to 5 months to return to normal [15]. Follow your clinician's plan for repeat labs.

You or your clinician can also report the reaction to the FDA. Reports help regulators spot problem products.

How to Build a Liver-Smart Supplement Routine

You don't have to give up supplements to protect your liver. These habits lower the risk:

• Add one new product at a time, and write down the start date. If something goes wrong, that date is the clue your clinician needs.
• Add up vitamin A across every bottle. Use the label math above and stay under 3,000 mcg RAE (10,000 IU) of retinol a day unless your clinician says otherwise [12].
• Choose formulas that list every amount. "Proprietary blends" hide doses, and multi-ingredient products are the most common source of supplement-related liver cases [1].
• Be careful with absorption boosters. That includes curcumin with piperine and green tea extract on an empty stomach [21, 22].
• Treat gram-level doses as medicine. Niacin in the grams-per-day range belongs under a clinician's care, with lab checks [4].
• Go easy on alcohol when you're trying something new. Your liver has to process both.
• Review your shelf once a year. This matters most after 60, when people take more products and the liver handles them less predictably [2, 23].

Label check: circle these on your bottles

• Retinyl palmitate or retinyl acetate (preformed vitamin A)
• Niacin labeled sustained-release, slow-release, or timed-release
• Green tea extract, EGCG, or "catechins"
• Curcumin with black pepper extract (piperine), or "enhanced absorption" turmeric
• Kava, black cohosh, or ashwagandha
• Usnic acid or usnea
• "Prohormone," "anabolic," or steroid-sounding ingredient names
• "Proprietary blend" with no amounts listed

Circling something doesn't mean you have to stop it. It means you know which bottles to mention at your next appointment. For more on reading labels, see how to read a supplement label like an expert.

Supplements After 60: What Changes

Supplement use climbs with age. About 80% of women and 67% of men 60 and older take at least one, and nearly 1 in 4 take four or more [2]. At the same time, age-related changes in the liver make it harder to predict how any one product will be handled [23].

Two findings stand out for women in midlife and beyond. In the large U.S. study, liver injuries from supplements other than bodybuilding products happened mostly in middle-aged women. They also led to death or transplant more often than injuries from prescription medicines did (13% vs. 3% of cases) [18]. The turmeric cases followed a similar pattern, with mostly women and a median age of 56 [6]. These numbers come from small groups of people who got sick, so they don't tell you your odds. They do tell you who should pay closest attention.

7 swaps that are easier on your liver

Do Liver Detox Cleanses Help?

Your liver already detoxes around the clock. It doesn't need a cleanse kit. What it needs is less to process and enough building blocks. For example, glutathione, one of the liver's main protective molecules, is built from amino acids, so eating enough protein matters [26].

Be wary of:

• "Detox kits" with stimulant laxatives, strong diuretics, or long lists of concentrated herbs
• Promises to "flush toxins" in a few days
• Advice to pair a cleanse with fasting or hard exercise

For simple food swaps that support your liver's normal work, see how to detox at home without a cleanse.

7 Mistakes That Put Extra Load on Your Liver

1. Taking green tea extract on an empty stomach "for better absorption." That's exactly what pushes EGCG levels higher [22, 24].
2. Picking the "high-absorption" turmeric for a stronger effect. Recent liver cases cluster around these formulas [9, 21].
3. Counting only your multivitamin's vitamin A. Skin, eye, and "immune" formulas often add more retinol [12].
4. Switching niacin forms to avoid the flush. Moving to sustained-release can trigger liver injury within days to weeks [4].
5. Starting three new products in the same week. If a problem shows up, no one can tell which one caused it [1].
6. Restarting a suspect product "just to check." Re-exposure can bring the injury back faster [4].
7. Trusting the plant name on the front of the bottle. Mislabeled black cohosh shows that the label and the contents don't always match [11].

Key Takeaways

• Supplements can damage the liver, but it's uncommon. They account for about 1 in 5 cases of drug-induced liver injury tracked in the U.S. [1].
• The best-documented supplements that cause liver damage are green tea extract, turmeric supplements, kava, black cohosh, high-dose vitamin A, and sustained-release niacin. Ashwagandha is rated a likely cause.
• A strong rating means the link is real, not that it's common. Kava and turmeric reactions are very rare.
• Dose, your genes, and the formula (absorption boosters, empty-stomach dosing) all change your risk.
• Most reactions show up within 1 to 6 months of starting a product.
• Watch for tiredness, nausea, itching, dark urine, and yellow eyes or skin. Get same-day care for jaundice.
• Never restart a product you suspect hurt your liver.
• After 60, simplify: one new product at a time, full-dose labels, and a yearly shelf review.

Frequently Asked Questions

Can supplements damage your liver?

Yes, but it's uncommon. Herbal and dietary supplements account for about 1 in 5 cases of drug-induced liver injury tracked in the U.S. Most problems involve high doses, concentrated extracts, multi-ingredient blends, or a rare immune reaction in a person who is susceptible.

Which supplements are most likely to cause liver damage?

The NIH LiverTox database rates green tea extract, turmeric supplements, kava, black cohosh, high-dose vitamin A, and high-dose sustained-release niacin as well-established causes. Ashwagandha is rated a likely cause. Bodybuilding products with hidden steroids and older weight-loss blends with usnic acid are also well documented.

Is turmeric bad for your liver?

The reported cases involve turmeric supplements, not turmeric used as a spice. Turmeric supplements are a rare but well-established cause of liver injury, estimated at about 1 in 10,000 to 1 in 100,000 people who take them. Recent cases cluster around high-absorption formulas, such as those with black pepper extract.

Is ashwagandha bad for your liver?

Liver injury from ashwagandha is rare, but LiverTox rates it a likely cause. In a published case series, jaundice and itching started 2 to 12 weeks after people began taking it, and liver tests returned to normal within 1 to 5 months.

Is green tea bad for your liver?

Brewed green tea has a strong safety record. The concern is concentrated green tea extract. In clinical trials, 800 mg or more of EGCG a day from supplements raised liver enzymes, and taking an extract on an empty stomach pushes blood levels higher.

What are the signs of liver damage from supplements?

Watch for unusual tiredness, nausea or poor appetite, itching without a rash, discomfort in the upper right belly, dark urine, pale stools, and yellowing of the eyes or skin. Get same-day care for yellow eyes or skin, very dark urine, or intense itching.

How long after starting a supplement can liver problems show up?

In most reports, within 1 to 6 months. Ashwagandha cases appeared at 2 to 12 weeks, turmeric at 1 to 4 months, and green tea extract at 1 to 6 months. Switching to sustained-release niacin can cause problems within days to weeks.

Can liver damage from supplements be reversed?

Many cases improve after the product is stopped, often over weeks to months. Some are severe and can lead to liver failure, so stopping early and getting checked matters. Never restart a product you suspect caused a reaction.

I'm over 60. Do I need to be more careful with supplements?

Yes. Most adults over 60 take supplements, about 1 in 4 take four or more, and the aging liver handles compounds less predictably. Add one product at a time, add up your vitamin A, and review your shelf with your clinician once a year.

The Bottom Line

Most supplements at sensible doses are well tolerated. Trouble starts when the dose, the form, or the number of products outruns what your liver can comfortably handle, or when you're one of the rare people whose immune system reacts. Know which ingredients carry the strongest evidence, add changes one at a time, and bring your clinician in when you're using higher doses or complex blends.

Your Next Step: A 10-Minute Bottle Audit

Line up every supplement you take. Circle anything on the label check list above, add up your retinol, and write a start date next to anything you began in the last six months. If something looks high, or you've noticed new symptoms, pause it and ask your clinician whether a quick liver panel makes sense. It's a small step that can save you a lot of worry later.

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These statements have not been evaluated by the Food and Drug Administration. This content is not intended to diagnose, treat, cure, or prevent any disease.

This article is for educational purposes only and is not a substitute for medical advice. Always talk with your healthcare provider before starting, stopping, or changing any supplement, especially if you are pregnant, breastfeeding, have a medical condition, or take prescription medicine.