Several supplements show real promise for reducing liver fat or improving liver enzyme levels, though the strength of evidence varies widely. Vitamin E has the strongest clinical backing, with a specific recommendation from liver specialists for a subset of patients. Others, like omega-3 fatty acids, milk thistle, and probiotics, have encouraging but less definitive results. Here’s what the research actually shows for each one.
Vitamin E: The Strongest Evidence
Vitamin E is the only supplement formally recommended by the American Association for the Study of Liver Diseases (AASLD) for fatty liver. Their 2012 guidelines specifically recommend 800 IU per day for adults with biopsy-confirmed MASH (the more advanced, inflammatory form of fatty liver, previously called NASH) who do not have diabetes. This recommendation came largely from the PIVENS trial, a landmark study comparing vitamin E at 800 IU daily against a placebo in nondiabetic patients. The vitamin E group showed meaningful improvements in liver inflammation and fat accumulation.
The catch is that this recommendation is narrow. It applies only to people without diabetes whose liver biopsies confirm active inflammation, not to everyone with some extra fat in their liver. There are also safety considerations with long-term, high-dose use. A 2004 meta-analysis found a small but statistically significant increase in all-cause mortality at doses of 400 IU per day or higher, roughly 39 additional deaths per 10,000 people. Later analyses that excluded poorly designed studies still found about a 4% increased mortality risk. No clear biological mechanism has been identified, though vitamin E supplementation has been linked to increased blood pressure. This is not a supplement to take casually at high doses without a specific reason.
Omega-3 Fatty Acids
Omega-3s, the type found in fish oil and krill oil, can reduce the amount of fat stored in the liver. The two key omega-3s involved are EPA and DHA, and supplementation with either or both has shown reductions in liver fat across multiple studies. However, the effect on actual liver inflammation (the progression from simple fatty liver to the more dangerous MASH) appears to be limited.
The form of omega-3 may matter. Animal studies consistently show that omega-3s delivered as phospholipids, the form found in krill oil, are substantially more effective at reducing liver fat than omega-3s delivered as triglycerides, the form found in standard fish oil. In one rodent study, krill-type omega-3s reduced liver fat by 50% while fish oil-type omega-3s reduced it by only 15% at equivalent doses. Another prevention study found a 68% reduction versus 32%. No human trials have directly compared these two forms for liver fat as a primary outcome, so the evidence is suggestive rather than conclusive. Still, if you’re choosing an omega-3 supplement specifically for liver health, krill oil or other phospholipid-based sources may have an edge.
Milk Thistle (Silymarin)
Milk thistle extract, known as silymarin, is one of the most widely used herbal supplements for liver conditions. A systematic review of clinical trials found substantial reductions in liver enzymes, the blood markers that indicate liver cell damage. The most striking results showed ALT reductions of 62% to 89% and AST reductions of 61% to 89% across several studies. These are significant numbers, though the quality and design of individual trials varied.
Silymarin works primarily as an antioxidant and has anti-inflammatory properties that appear to protect liver cells from damage. It’s generally well-tolerated, which is one reason it remains popular. The main limitation is that lowering liver enzymes on a blood test doesn’t automatically mean the underlying fat accumulation or scarring is reversing. More rigorous, larger trials are still needed to confirm whether silymarin changes the actual trajectory of the disease.
Berberine
Berberine is a plant compound that has gained attention for its effects on blood sugar and cholesterol, both of which are tightly linked to fatty liver. A randomized clinical trial of 1.5 grams daily for 16 weeks in patients with fatty liver and blood sugar problems found that berberine reduced liver fat content. A larger, more recent trial published in JAMA Network Open tested a lower dose of 1 gram daily (500 mg twice a day) for six months, paired with lifestyle changes. This lower dose was chosen because research suggests it works about as well as higher doses for improving metabolic markers, while causing far fewer gastrointestinal side effects like nausea and diarrhea.
Berberine’s appeal is that it targets several of the metabolic problems that drive fatty liver simultaneously: it improves how the body handles insulin, lowers blood lipids, and reduces visceral fat (the deep abdominal fat that’s closely tied to liver fat). If you have fatty liver alongside high blood sugar or cholesterol, berberine addresses multiple problems at once.
Probiotics
The connection between gut bacteria and liver health is well established. Your liver receives blood directly from the intestines, so an unhealthy gut microbiome can send inflammatory signals straight to the liver. Several probiotic formulations have shown measurable reductions in liver fat in human trials.
A multi-strain combination of Lactobacillus and Bifidobacterium species taken for 12 weeks reduced fat inside the liver. Bifidobacterium longum combined with fructo-oligosaccharides (a type of prebiotic fiber) for 24 weeks decreased both liver fat and overall disease activity. Lactobacillus reuteri paired with the prebiotic fibers guar gum and inulin for three months also reduced liver fat on MRI scans. VSL#3, a well-known multi-species probiotic, lowered a clinical measure of liver fat over three months.
The pattern here is that combination products, especially those pairing probiotic bacteria with prebiotic fiber (called synbiotics), tend to perform better than single strains alone. If you’re considering a probiotic for liver health, look for multi-strain formulas that include both Lactobacillus and Bifidobacterium species, ideally combined with a prebiotic.
Choline: A Nutrient You Might Be Missing
Choline isn’t a trendy supplement, but it plays a direct role in how your liver processes and exports fat. When choline intake drops too low, fat accumulates in the liver. In a controlled study of 57 adults fed a very low-choline diet (less than 50 mg per 70 kg of body weight daily), 37 of them developed liver dysfunction. Liver function returned to normal once choline was restored to even 25% to 75% of the recommended intake. In a small study of patients receiving IV nutrition, adding 2 grams of choline completely resolved fatty liver in every patient who received it.
The adequate intake is 550 mg per day for adult men and 425 mg per day for adult women. These levels were set specifically based on preventing liver damage. Many people fall short, particularly those who eat few eggs, meat, or cruciferous vegetables, the main dietary sources. Before reaching for exotic supplements, it’s worth making sure you’re meeting this basic nutritional requirement. Choline is available as a standalone supplement, often in the form of choline bitartrate or phosphatidylcholine.
Curcumin: Popular but Unproven for Liver Fat
Turmeric supplements, standardized to their active compound curcumin, are often marketed for liver health. The actual evidence is disappointing. A controlled trial using a well-absorbed curcumin formulation (400 mg of curcuminoids daily) for six weeks in people with obesity found no significant reduction in liver fat compared to placebo. It also found no effect on any measured inflammation marker, including C-reactive protein, TNF-alpha, or several interleukins. Curcumin may have benefits for other conditions, but the data for reducing liver fat specifically does not support its use.
A Note on What “Fatty Liver” Means Now
If you’ve been reading about this topic, you may see different names used. The medical community recently renamed nonalcoholic fatty liver disease (NAFLD) to metabolic dysfunction-associated steatotic liver disease, or MASLD. The more severe inflammatory stage, previously called NASH, is now MASH. The new names reflect the understanding that this condition is driven by metabolic factors like insulin resistance, excess weight, and high blood lipids. More than 30% of the global population has some degree of MASLD, making it the most common chronic liver disease worldwide.
The name change matters because it shifts the focus toward treating the underlying metabolic dysfunction, not just the liver itself. Supplements that improve insulin sensitivity, reduce inflammation, or lower blood lipids can help the liver indirectly by addressing those root causes. This is why berberine and omega-3s, which target metabolic health broadly, show benefits for the liver even though they weren’t designed as “liver supplements.” Weight loss of 5% to 10% of body weight remains the single most effective intervention, and any supplement strategy works best as an addition to dietary changes and physical activity, not a replacement.