Several supplements have solid evidence behind them for supporting liver health, ranging from well-studied options like milk thistle to lesser-known ones like TUDCA. The best choice depends on what your liver needs, whether that’s antioxidant protection, help processing fat, or support for bile flow. Here’s what the research actually shows for each one.
Milk Thistle (Silymarin)
Milk thistle is the most widely studied liver supplement, and for good reason. Its active compound, silymarin, protects liver cells in two key ways: it blocks harmful substances from entering liver cells by occupying receptor sites on cell membranes, and it reduces oxidation and inflammation inside the liver. Silymarin also stimulates protein production in damaged liver cells, which helps the liver rebuild and regenerate tissue.
An effective dose for general liver support is 200 to 400 mg of silymarin per day. For more serious liver conditions like cirrhosis, studies have used 140 mg three times daily. Milk thistle is considered safe at doses up to 420 mg per day for extended periods, with studies tracking use for up to 41 months without significant problems.
N-Acetylcysteine (NAC)
NAC is the supplement form of the amino acid L-cysteine, and its value for the liver comes down to one thing: it’s the raw material your body uses to make glutathione. Glutathione is the liver’s primary antioxidant, the molecule responsible for neutralizing toxins and protecting liver cells from oxidative damage. When your liver is under stress from alcohol, medications, or environmental toxins, glutathione gets depleted fast. NAC replenishes the supply.
This isn’t just theoretical. NAC is used in hospitals as the standard treatment for acetaminophen (Tylenol) overdose, precisely because it floods the liver with the building blocks it needs to recover. As a daily supplement, doses up to 3 grams per day have shown no side effects in clinical studies, and oral NAC is rapidly absorbed. Most people taking it for general liver support use between 600 and 1,200 mg per day.
Curcumin (Turmeric Extract)
Curcumin, the active compound in turmeric, has measurable effects on liver enzymes. A meta-analysis of randomized controlled trials found that curcumin supplementation reduced ALT by about 4 units per liter and AST by nearly 4 units per liter. Those are the two enzymes doctors check to gauge liver inflammation and damage, so bringing them down indicates less stress on liver cells.
The reductions are modest, which matters for context. If your liver enzymes are mildly elevated due to fatty liver or general inflammation, curcumin can nudge them in the right direction. It’s not a rescue remedy for serious liver disease, but as part of an overall approach it contributes meaningful anti-inflammatory activity. Standard supplemental doses range from 500 to 1,500 mg of curcumin per day, and pairing it with black pepper extract dramatically improves absorption.
Choline
Choline is less glamorous than the other supplements on this list, but it may be the most important for preventing fatty liver. Your liver converts choline into phosphatidylcholine, a compound that packages fat into carrier proteins and shuttles it out of the liver. Without enough choline, fat simply accumulates in liver cells. This is one of the direct, well-established mechanisms behind non-alcoholic fatty liver disease.
The recommended daily intake is 550 mg for men and 425 mg for women. Most people don’t hit those numbers through diet alone, especially if they eat few eggs, which are the richest common food source. Choline deficiency is widespread and often overlooked, making this one of the supplements most likely to fill an actual gap in your nutrition. If you already have fatty liver or are concerned about it, checking your choline intake is a practical first step.
Artichoke Leaf Extract
Artichoke leaf extract supports the liver primarily by increasing bile production. Bile is how your liver flushes out waste products and toxins, so more efficient bile flow means the liver clears itself more effectively. The extract also appears to reduce inflammation in liver cells and promote the growth of new liver tissue.
In a clinical trial of 90 people with non-alcoholic fatty liver disease, taking 600 mg of artichoke extract daily for two months improved liver function. Multiple reviews have also found that artichoke supplementation lowers liver enzyme levels, which signals reduced inflammation and less ongoing damage. This makes artichoke extract a reasonable option if you’re looking for bile support or have mildly elevated liver markers.
TUDCA
Tauroursodeoxycholic acid, or TUDCA, is a water-soluble bile salt that your body produces naturally in small amounts. It’s particularly useful when bile isn’t flowing properly, a condition called cholestasis. When bile backs up in the liver, the concentrated bile acids become toxic to liver cells. TUDCA counteracts that toxicity and restores normal bile flow.
Randomized controlled trials have shown that TUDCA improves liver function in patients with cirrhosis, hepatitis C-related chronic hepatitis, and cholestasis. Across these studies, TUDCA drastically lowered ALT, AST, and ALP, all key markers of liver inflammation. It’s used as a reference drug for treating cholestasis, meaning it’s the standard other treatments are compared against. TUDCA can also dissolve cholesterol gallstones to a size small enough to pass. For general liver support, typical supplemental doses range from 250 to 1,500 mg per day.
Coffee Deserves a Mention
It’s not a supplement, but coffee is one of the most consistently liver-protective substances in nutritional research. People who drink 3 to 4 cups per day have a lower risk of liver disease, including fibrosis, cirrhosis, and liver cancer, compared to non-drinkers. The benefit comes from coffee’s complex mix of antioxidants and anti-inflammatory compounds, not just caffeine. If you already drink coffee, this is one health habit that’s working in your liver’s favor.
Choosing the Right Combination
These supplements address different aspects of liver health, so the right choice depends on your situation. If you’re concerned about fatty liver, choline and curcumin target fat metabolism and inflammation directly. If you’re exposed to toxins regularly, whether from alcohol, medications, or environmental sources, NAC and milk thistle strengthen the liver’s detoxification and repair systems. If bile flow is the issue, TUDCA and artichoke extract are the most targeted options.
Many of these supplements work well together because they operate through different mechanisms. Milk thistle protects cell membranes while NAC replenishes antioxidant reserves inside the cell. Choline moves fat out while curcumin reduces the inflammation that fat accumulation causes. There’s no single “best” liver supplement, but understanding what each one does lets you match your approach to what your liver actually needs.