Is Cinnamon Good for Fatty Liver? Cassia, Coumarin and Safety

TL;DR

• Cinnamon as a spice is fine with fatty liver: a teaspoon has 6 calories and no meaningful sugar or fat, and it can replace sugar in oatmeal, coffee and yogurt.
• Cassia cinnamon, the most common type in North America, contains coumarin, which can harm the liver in sensitive people at high intakes. Large daily amounts are the issue, not a sprinkle.
• Cinnamon supplements are not a proven fatty liver treatment. If you use a lot of cinnamon every day, choose Ceylon cinnamon, and ask your doctor before taking capsules.

Yes, cinnamon is fine for fatty liver in the amounts most people use in cooking, and it can help you cut back on sugar. For people with MASLD (formerly NAFLD), the one caution is coumarin, a natural compound found in high amounts in cassia cinnamon. Coumarin can harm the liver in sensitive people when intake stays high for a long time, so heavy daily users and anyone thinking about supplements should pay attention to which cinnamon they buy.

Here’s what the research says, how cassia and Ceylon cinnamon differ, and how to use cinnamon safely.

Does Cinnamon Help Fatty Liver?

The evidence for a direct benefit is thin:

• One small trial (2014). In Iran, 50 people with fatty liver took either two 750 mg cinnamon capsules a day (1,500 mg in total) or a placebo for 12 weeks. Everyone got advice on a balanced diet and physical activity. The cinnamon group showed drops in ALT, AST and GGT, as well as fasting blood sugar, insulin resistance, total cholesterol and triglycerides.
• Two larger reviews (2021). Two separate meta-analyses, in Phytotherapy Research and Complementary Therapies in Medicine, each pooling seven randomized trials of cinnamon in adults, found no significant overall effect on the liver enzymes ALT, AST or ALP. One, covering 256 people, saw ALT fall by about 4 units in people with type 2 diabetes, a modest change.
• A 2026 network meta-analysis. A review comparing herbal remedies across 131 randomized trials in people with MASLD ranked cinnamon among the top herbs for lowering ALT, AST and GGT. But its cinnamon result rested on a single small, three-month trial, the 2014 study above, and it covered liver enzymes, not liver fat or scarring.

The NIH’s National Center for Complementary and Integrative Health (NCCIH) sums it up: “Research doesn’t clearly support using cinnamon for any health condition.” It adds that it’s unclear whether cinnamon supplements help with diabetes or weight loss, and that many studies don’t say which kind of cinnamon they tested.

The 2024 European liver guideline (EASL–EASD–EASO) states that “nutraceuticals cannot be recommended since there is insufficient evidence of their effectiveness” for MASLD, nor of their safety. That category includes food supplements and herbal products. To understand what the enzyme numbers in these studies mean, see our guide to ALT and AST levels.

Cassia vs. Ceylon Cinnamon: What’s the Difference?

According to NCCIH, cassia is the most common type sold in North America. The two types differ in one way that matters for your liver: coumarin.

	Cassia cinnamon	Ceylon cinnamon
Botanical name	Cinnamomum aromaticum	Cinnamomum verum, known as “true” cinnamon
Where it grows	Southeastern Asia	Mainly Sri Lanka
How to find it	The most common type sold in North America	Look for “Ceylon cinnamon” on the label
Coumarin	About 3,000 mg per kg on average, with samples up to 10,000 mg per kg	Low levels
Sticks	One relatively thick layer forming a small roll	Several thin layers, like a cut cigar

Sources: NCCIH; Germany’s Federal Institute for Risk Assessment (BfR).

According to the BfR, ground cassia and Ceylon are hard to tell apart, so if you want Ceylon, buy a product that names it on the label.

Can Cinnamon Damage Your Liver?

In normal food amounts, it’s unlikely. With heavy, long-term use of cassia, it’s possible in sensitive people.

Here’s what the risk assessments say:

• What coumarin does. The BfR explains that in especially sensitive people, “even comparatively small quantities of coumarin can cause liver damage, although the effect is usually reversible.” When coumarin was used as a medicine, mild cases showed raised liver enzymes and severe cases showed liver inflammation with jaundice. The BfR also notes that no cases of liver damage from eating cinnamon had been described in the scientific literature.
• The limit. The tolerable daily intake for coumarin is 0.1 mg per kg of body weight, a value derived by the BfR, which notes that the European Food Safety Authority calculated the same value. That’s 6 mg a day for a 60 kg (132 lb) adult.
• How much cassia that is. Because cassia averages about 3,000 mg of coumarin per kg, the BfR estimates a 60 kg adult reaches the limit with about 2 g of cassia a day. USDA lists a teaspoon of ground cinnamon at 2.6 g, so that’s a little under a teaspoon. Heavier people have a proportionally higher limit, but a high-coumarin batch would reach it with less cinnamon.
• Short-term is not the worry. The BfR states that going over the limit “in the short run” does not pose health risks. The concern is large amounts every day over a long period.
• People with liver disease. NCCIH notes that “prolonged use of cassia cinnamon could be an issue for sensitive people, such as those with liver disease.”
• Supplements. The BfR warns that cinnamon supplements “may contain high levels of coumarin” and that cassia powder taken as a supplement may, depending on the dose, exceed the daily limit. A 2015 case report in the American Journal of Case Reports described a 73-year-old woman on a statin who developed hepatitis about a week after starting cinnamon supplements; her doctors suspected the combination. One case doesn’t prove cause, but it’s a reason to check with your doctor first.

The European Union limits coumarin in cinnamon foods, for example 50 mg per kg in traditional or seasonal cinnamon baked goods and 5 mg per kg in desserts. There is no limit for cinnamon sold as a spice.

If you have cirrhosis, ask your hepatologist before using large amounts of cinnamon or any supplement. Our cirrhosis diet guide covers how nutrition advice changes at that stage.

Where Cinnamon Foods Go Wrong: The Sugar

For most people with fatty liver, the bigger problem isn’t the cinnamon. It’s the sugar that often comes with it:

Food	Serving	Calories	Sugars	Fiber
Ground cinnamon	1 tsp (2.6 g)	6	0.1 g	1.4 g
Plain instant oatmeal, dry	1 packet (28 g)	101	0.4 g	2.8 g
Cinnamon-spice instant oatmeal, dry	1 packet (45 g)	166	11.4 g	3.6 g
Brown sugar–cinnamon toaster pastry	1 pastry (51 g)	189	13.9 g	1.2 g
Frosted cinnamon bun	1 bun (65 g)	294	16.7 g	0.8 g

Source: USDA FoodData Central (SR Legacy).

A frosted cinnamon bun also carries 8.2 g of saturated fat. The European liver guideline recommends limiting ultra-processed foods rich in sugars and saturated fat and avoiding sugar-sweetened beverages (see is sugar bad for fatty liver). A teaspoon of cinnamon stirred into plain oats gives you the flavor without the 11 g of sugar in a flavored packet.

How to Use Cinnamon in a Fatty Liver Diet

Cinnamon’s best role is helping you use less sugar:

• Flavor plain oatmeal or yogurt with cinnamon and fruit instead of buying sweetened versions.
• Upgrade your coffee. A pinch of cinnamon can replace flavored creamer or a spoonful of sugar (see is coffee good for fatty liver).
• Season vegetables. Cinnamon works on roasted carrots, squash and sweet potatoes without brown sugar.
• Use it in savory dishes. A little cinnamon adds depth to chili, lentil stews and Moroccan-style chicken.
• Choose Ceylon for heavy use. If you add cinnamon to several foods every day, a jar labeled Ceylon cinnamon lowers your coumarin intake.
• Skip supplements unless your doctor agrees. The BfR notes that cassia-based supplements may, depending on the dose, push you past the coumarin limit.

Cinnamon-flavored foods can hide a lot of sugar. An app like Liverly can log your breakfast and show the added sugar alongside the rest of your day.

The Bottom Line

Cinnamon is fine for fatty liver as a spice, and it’s a handy way to replace sugar. Supplements haven’t been shown to treat fatty liver. One small trial lowered liver enzymes, and a 2026 review ranked cinnamon highly on the strength of that same trial, but broader reviews found no overall effect on liver enzymes, and the European guideline doesn’t recommend supplements for MASLD.

The real caution is coumarin in cassia cinnamon. A sprinkle is not a concern, but large daily amounts over months could matter, especially if your liver is already under strain. If you use a lot, switch to Ceylon cinnamon, and talk to your doctor before taking cinnamon capsules, particularly if you take other medicines.

Sources

• BfR (German Federal Institute for Risk Assessment): FAQ on coumarin in cinnamon and other foods
• NCCIH: Cinnamon: Usefulness and Safety
• Askari et al. Cinnamon may have therapeutic benefits on lipid profile, liver enzymes, insulin resistance, and hs-CRP in NAFLD patients (Nutrition Research, 2014)
• Mousavi et al. What is the influence of cinnamon supplementation on liver enzymes? A systematic review and meta-analysis (Phytotherapy Research, 2021)
• Chen Liang et al. Comparative efficacy of herbal products for improving liver enzymes and inflammation in MASLD: a systematic review and network meta-analysis (Gastro Hep Advances, 2026)

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