How Cloves Work as an Anti-Inflammatory

Cloves contain a compound called eugenol, which makes up about 70 to 90 percent of clove oil. In laboratory and animal studies, eugenol has been shown to reduce the activity of inflammatory molecules in cells and tissues. When researchers explore eugenol to inflamed tissue in a petri dish or give it to mice with induced inflammation, the swelling and inflammatory markers decrease.

The mechanism is fairly well understood at the cellular level: eugenol appears to block or reduce the production of cytokines and other signaling molecules that drive inflammation. However, the jump from "eugenol reduces inflammation in a cell culture" to "eating cloves will reduce your arthritis" is much larger than it appears. Human studies on cloves specifically are limited, and most evidence comes from isolated eugenol in concentrated doses, not from the amount you would consume in food.

Cloves also contain other compounds—including flavonoids and phenolic acids—that have antioxidant properties in test-tube studies. Antioxidants neutralize free radicals, unstable molecules that can damage cells. Again, this is well-documented in controlled lab settings, but translating that to real-world benefit in a living person requires human research that is still sparse.

Key Takeaways

  • Eugenol, the main active compound in cloves, reduces inflammatory markers in cell and animal studies, but human evidence is limited to small trials and observational data.
  • Cloves have been used in traditional medicine for pain and inflammation for centuries, but this history does not replace the need for controlled human research.
  • The amount of eugenol in a typical serving of cloves as a spice is much lower than the doses used in most laboratory studies.
  • Cloves may have mild antimicrobial and antioxidant effects, but these are not substitutes for medical treatment of infections or chronic diseases.

What Human Studies Show About Clove Use

A small number of human trials have tested cloves or eugenol directly. One study published in the Journal of Medicinal Food found that people who took eugenol supplements showed a modest reduction in joint pain and swelling compared to placebo, but the sample size was fewer than 50 people. Another trial looked at eugenol's effect on dental pain after tooth extraction and found it reduced pain more effectively than placebo, though the effect was comparable to standard pain relievers.

Most other human evidence comes from observational studies—surveys and dietary analyses that track what people eat and what health outcomes they report. These studies can show associations (people who eat more cloves tend to report less inflammation) but cannot prove that cloves caused the improvement. People who use cloves regularly may also exercise more, eat more vegetables, or have other habits that reduce inflammation.

The bottom line from the human research is that cloves may have a mild anti-inflammatory effect, but the evidence is not strong enough to recommend them as a treatment for any specific condition. They are safe to use as a spice in normal amounts, and if you enjoy them, there is no harm in including them in your diet.

Cloves and Dental Health

Eugenol has a long history in dentistry. It is an ingredient in some temporary fillings, root canal sealers, and dental cements because it has mild antimicrobial properties and can numb tissue slightly. This is one area where cloves have a clearer evidence base: eugenol does kill certain bacteria in the mouth when applied in concentrated form.

However, using whole cloves or clove oil as a home remedy for a toothache is different from using pharmaceutical-grade eugenol in a dental setting. Clove oil is much more concentrated than eating cloves, and even clove oil applied directly to a tooth has not been extensively tested in rigorous human trials. Some people report that clove oil numbs tooth pain temporarily, which may be real, but it is not a substitute for seeing a dentist if you have an infection or cavity.

If you are interested in clove oil for oral discomfort, dilute it in a carrier oil before explore it to your gum or tooth, and do not swallow it undiluted. Talk to your dentist before using it, especially if you are taking blood thinners or have gum disease.

Cloves, Blood Sugar, and Metabolic Health

A few small studies have suggested that eugenol or clove extract may improve insulin sensitivity or lower blood sugar in people with diabetes. One trial gave people with type 2 diabetes a clove extract supplement for eight weeks and found modest improvements in fasting blood sugar and insulin levels compared to placebo. Another study in people without diabetes found that adding cloves to a meal slowed the rise in blood sugar after eating.

These findings are interesting but preliminary. The studies were small, the doses were higher than typical culinary amounts, and the effects were modest. No major diabetes organization currently recommends cloves as part of diabetes management. If you have diabetes or prediabetes, cloves are fine to use as a spice, but they should not replace medication or dietary changes that your doctor has recommended.

How Much Eugenol Is in Food Versus Supplements

A single teaspoon of ground cloves contains roughly 50 to 100 milligrams of eugenol, depending on freshness and storage. Most of the human studies that showed anti-inflammatory or metabolic effects used eugenol doses of 500 to 1,000 milligrams or higher. This means you would need to eat several teaspoons of cloves daily to match the doses tested in research.

Clove supplements and clove oil are much more concentrated. A single drop of clove oil can contain 50 to 100 milligrams of eugenol. This is why clove oil should never be swallowed undiluted and why supplements require careful dosing. If you are considering a clove supplement for a health reason, talk to your doctor first, especially if you take blood thinners, have a bleeding disorder, or are pregnant.

Safety and Drug Interactions

Cloves are safe in normal culinary amounts for most people. They have been used in cooking and traditional medicine for thousands of years without major safety concerns at typical doses. However, concentrated forms—clove oil or high-dose supplements—carry more risk.

Eugenol can thin the blood slightly and may increase bleeding risk if you take anticoagulants like warfarin or aspirin. It may also interact with certain medications that are broken down by the liver. Clove oil applied to skin or gums can cause irritation or allergic reactions in sensitive people. Pregnant women should avoid clove supplements and clove oil, though using cloves as a spice is considered safe.

If you are taking medications, have a bleeding disorder, or are pregnant or breastfeeding, check with your doctor before using clove supplements or clove oil.

Cloves Versus Other Anti-Inflammatory Herbs

Cloves are one of several spices with documented anti-inflammatory compounds. Turmeric contains curcumin, ginger contains gingerols, and cinnamon contains cinnamaldehyde—all of which show anti-inflammatory effects in lab studies. Like cloves, these spices have stronger evidence in cell and animal models than in human trials, but some have slightly more human research behind them.

Turmeric and ginger have been studied more extensively in human populations, particularly for joint pain and digestive inflammation. If you are looking for spices with the strongest current evidence for anti-inflammatory benefit, turmeric and ginger have a slight edge. That said, cloves are a good addition to a diet rich in whole foods, and variety in spices means variety in the compounds you consume.

Frequently Asked Questions

Can clove oil cure a toothache?

Clove oil may numb a toothache temporarily because eugenol has mild numbing properties. However, this is not a cure. A toothache usually signals a cavity, infection, or other problem that needs dental treatment. Use clove oil only as temporary relief while you arrange to see a dentist.

How much clove should I eat to get anti-inflammatory benefits?

Most human studies used doses much higher than typical culinary amounts. A teaspoon of cloves in food is unlikely to produce the same effect as a 500-milligram supplement. If you want to try cloves for inflammation, use them as a spice in your regular diet and talk to your doctor about whether a supplement makes sense for your situation.

Is clove oil safe to swallow?

Clove oil should not be swallowed undiluted. It is too concentrated and can irritate your mouth, throat, and stomach. If you want to use clove oil internally, dilute it in a carrier oil or water first, and use only a few drops. Better yet, use whole cloves or ground cloves in food.

Do cloves interact with blood thinners?

Eugenol may have mild blood-thinning effects, so clove supplements or clove oil could potentially increase bleeding risk if you take warfarin, aspirin, or other anticoagulants. Using cloves as a spice is unlikely to cause problems, but talk to your doctor before taking clove supplements if you are on blood thinners.

Are cloves better than turmeric for inflammation?

Both contain compounds with anti-inflammatory effects in lab studies. Turmeric has slightly more human research supporting its use, but cloves are also safe and may help. Using both as part of a varied diet is a reasonable approach, and neither should replace medical treatment for inflammatory conditions.