Is Garlic Good for Fatty Liver? Cooking Garlic vs. Supplements

TL;DR

• Garlic used in cooking is a great fit for a fatty liver diet: it adds big flavor with almost no calories, salt or fat.
• Garlic powder supplements lowered liver enzymes in a few small trials, but the evidence is thin, and the European liver guideline doesn’t recommend supplements for MASLD.
• Garlic supplements may increase bleeding risk, especially with blood thinners or aspirin. Ask your doctor before taking one.

Garlic in food is good for fatty liver, and you can use it freely. For people with MASLD (formerly NAFLD), garlic makes vegetables, beans, fish and whole grains taste better without adding salt, sugar or saturated fat. Garlic supplements are a different question: a few small studies look promising, but they’re not a proven treatment, and they carry some risks.

Here’s what the research shows, how garlic in food differs from garlic pills, and how to get the most out of it in your kitchen.

What Does the Research Say About Garlic and Fatty Liver?

Garlic has some human research behind it, though most of it is small:

• A large observational study (2019). Researchers in Tianjin, China, looked at diet and liver ultrasounds in 24,106 adults. Men who ate raw garlic 4 to 6 times a week had about a third lower odds of having fatty liver than men who ate it less than once a week (odds ratio 0.66). No link was found in women. Because this was an observational study, it can’t show garlic caused the difference; people who eat a lot of garlic may differ in other ways.
• A randomized trial of garlic powder (2020). In Iran, 90 people with fatty liver took either four 400 mg garlic powder tablets a day (1,600 mg in total) or a starch placebo for 12 weeks. Liver fat (steatosis) improved more in the garlic group, and ALT, AST and GGT, three common liver enzymes, fell compared with placebo. Total cholesterol, triglycerides and LDL cholesterol also dropped.
• A meta-analysis (2022). Pooling four trials with 186 patients, researchers found garlic was linked to lower ALT and AST, along with improvements in cholesterol, triglycerides and fasting blood sugar. They concluded that “more high-quality clinical trials are needed.”

Why the caution? Four trials and fewer than 200 people is a very small evidence base. The main trial lasted only 12 weeks, used supplements rather than food, and measured liver enzymes and steatosis rather than scarring (fibrosis), the part of fatty liver disease most tied to long-term liver health. To understand what enzyme changes mean, see our guide to ALT and AST levels.

What Do Liver Guidelines Say About Garlic Supplements?

The 2024 European liver guideline (EASL–EASD–EASO) covers supplements as a group. It defines nutraceuticals as food supplements, herbal products and gut microbiota-modifying agents, and states: “In adults with MASLD, nutraceuticals cannot be recommended since there is insufficient evidence of their effectiveness… nor of their safety.”

The approaches with strong evidence are weight loss if you carry extra weight, a Mediterranean-style diet, limiting ultra-processed foods and avoiding sugary drinks. The guideline sets weight-loss targets of at least 5% to reduce liver fat, 7–10% to improve liver inflammation and 10% or more to improve fibrosis. Garlic can help make that kind of diet enjoyable, which is its real contribution.

Are Garlic Supplements Safe?

Garlic supplements aren’t risk-free. The NIH’s National Center for Complementary and Integrative Health (NCCIH) says:

• Garlic taken by mouth “has been used safely in research studies that lasted as long as 7 years.”
• Side effects include breath and body odor, abdominal pain, gas and nausea, and some people are allergic to garlic.
• “Taking garlic supplements may increase the risk of bleeding.” Tell your health care providers if you take them, especially before surgery or if you take anticoagulants or aspirin.
• Garlic in amounts greater than those found in foods may not be safe during pregnancy or breastfeeding.

NCCIH also notes that garlic supplements may lower total and LDL cholesterol “to a small extent” in people with high cholesterol, and may lower blood pressure and blood sugar slightly. Those are modest effects, not substitutes for prescribed medicine.

If you have cirrhosis or take several medicines, talk to your hepatologist before adding any supplement. Our cirrhosis diet guide explains why nutrition advice changes at that stage.

Garlic and Garlic-Flavored Foods Compared

Garlic itself is almost calorie-free. The foods it’s paired with are where salt and saturated fat come in:

Food	Serving	Calories	Saturated fat	Sodium
Raw garlic	1 clove (3 g)	4	0 g	<1 mg
Garlic powder	1 tsp (3.1 g)	10	0 g	2 mg
Table salt	1 tsp (6 g)	0	0 g	2,325 mg
Olive oil	1 tbsp (13.5 g)	119	1.9 g	0 mg
Butter, salted	1 tbsp (14.2 g)	102	7.3 g	91 mg
Garlic bread, frozen	1 slice (43 g)	151	2.3 g	234 mg

Source: USDA FoodData Central (SR Legacy).

A few takeaways:

• Garlic powder is not garlic salt. Plain garlic powder has almost no sodium, while garlic salt has salt added, so check the label. See is salt bad for fatty liver for why sodium matters.
• Sauté in olive oil, not butter. A tablespoon of butter has nearly four times the saturated fat of olive oil. See is olive oil good for fatty liver.
• Garlic bread is mostly bread. A frozen slice brings 151 calories and 234 mg of sodium along with the garlic (see is bread bad for fatty liver).

How to Use More Garlic in a Fatty Liver Diet

Garlic’s biggest benefit is practical: it makes healthy food taste good, and that makes a diet easier to stick with.

• Roast vegetables. Toss broccoli, green beans, cauliflower or carrots with olive oil, sliced garlic, black pepper and a pinch of salt.
• Flavor beans and lentils. Sauté garlic and onion in olive oil before adding beans, tomatoes and spices.
• Make a quick dressing. Whisk minced raw garlic with olive oil, lemon juice and mustard instead of buying creamy dressings.
• Cook fish and chicken with it. Garlic, lemon and herbs turn plain protein into a flavorful dinner with no sugary sauce.
• Swap salt for aromatics. Garlic, onion, citrus zest, herbs and spices let you cut back on the salt shaker.
• Pair it with other spices. Garlic, ginger and turmeric make a classic base for curries and stir-fries.
• Keep garlic on hand. Fresh heads, a jar of minced garlic or salt-free garlic powder all work.

Cooking at home makes it easier to see what’s in your food. If you want to check a garlicky dinner against your daily goals, an app like Liverly can score the meal for you.

The Bottom Line

Garlic in food is good for fatty liver. It adds flavor with almost no calories, salt, sugar or fat, and it pairs naturally with the vegetables, beans, olive oil and fish at the heart of a Mediterranean-style diet. A large Chinese study linked frequent raw garlic to less fatty liver in men, though it couldn’t prove cause and effect.

Garlic supplements lowered liver enzymes in a handful of small trials, but that’s not enough to call them a treatment, and the European liver guideline doesn’t recommend supplements for MASLD. They may also raise bleeding risk. Cook with garlic generously, and talk to your doctor before taking it in pill form.

Sources

• Zhang et al. Association between dietary raw garlic intake and newly diagnosed nonalcoholic fatty liver disease: a population-based study (European Journal of Endocrinology, 2019)
• Sangouni et al. Effect of garlic powder supplementation on hepatic steatosis, liver enzymes and lipid profile in patients with NAFLD: a double-blind randomised controlled clinical trial (British Journal of Nutrition, 2020)
• Rastkar et al. Systematic review and meta-analysis of the effect of garlic in patients with NAFLD (Indian Journal of Gastroenterology, 2022)
• NCCIH: Garlic: Usefulness and Safety
• EASL–EASD–EASO Clinical Practice Guidelines on the management of MASLD: Executive Summary (2024)

This article is for informational purposes only and is not medical advice. Talk to your doctor or hepatologist about your specific situation.