Cloves Benefits, Uses and What Science Says
Cloves are more than just a fragrant spice used in cooking. These small, dried flower buds of the Syzygium aromaticum tree have been used traditionally for centuries and contain bioactive compounds that have attracted increasing scientific interest.
From antioxidant and antimicrobial properties to potential effects against certain parasites, research suggests that cloves may offer several health-related benefits. However, it is important to distinguish between traditional uses, laboratory findings, animal studies, and benefits that have actually been demonstrated in humans.
What Are Cloves?
Cloves are the dried flower buds of Syzygium aromaticum, an evergreen tree native to the Maluku Islands of Indonesia. Today, cloves are widely used as a culinary spice and as a source of clove essential oil.
One of the most important compounds in cloves is eugenol, a phenolic compound that contributes to their characteristic aroma and many of their biological properties. Clove oil is particularly rich in eugenol, which is considered its major active component.
Cloves Benefits: What Does Science Say?
1. Cloves Are Rich in Antioxidants
One of the best-known properties of cloves is their antioxidant activity.
Antioxidants help protect cells from oxidative stress caused by unstable molecules known as free radicals. Research on cloves and eugenol has demonstrated significant antioxidant activity, although much of the evidence comes from laboratory and experimental studies rather than large human clinical trials.
Adding cloves to foods can therefore be an easy way to increase the variety of plant compounds in the diet.
2. Cloves May Have Anti-Inflammatory Properties
Eugenol and other compounds found in cloves have demonstrated anti-inflammatory activity in experimental research.
Inflammation is a normal part of the body’s immune response, but excessive or prolonged inflammation can contribute to various health problems. Studies investigating eugenol suggest that it may influence biological pathways involved in inflammation.
However, this does not mean that cloves should be considered a treatment for inflammatory diseases.
3. Cloves Have Antimicrobial Properties
Cloves have also received attention for their antimicrobial effects.
Laboratory studies have found that clove essential oil and eugenol can act against several microorganisms, including certain bacteria and fungi. This is one reason cloves have traditionally been used in food preservation and oral-care preparations.
The antimicrobial activity of cloves is promising, but laboratory activity does not automatically mean that consuming cloves will treat an infection in humans.
4. Can Cloves Help Fight Parasites?
This is one of the most interesting areas of research surrounding cloves.
Cloves may have antiparasitic properties, but the evidence needs to be interpreted carefully.
Studies have investigated clove extracts, clove essential oil, and eugenol against several types of parasites. Experimental research has reported activity against organisms including Giardia, Schistosoma, Fasciola, and certain intestinal worms.
Some experimental research has found that clove essential oil can affect parasites such as Giardia duodenalis under laboratory conditions.
The proposed antiparasitic effects are thought to be related partly to compounds such as eugenol, which may interfere with cellular membranes and other biological processes in parasites.
Does Eating Cloves Kill Intestinal Parasites?
There is an important distinction here.
Although laboratory research suggests that cloves and eugenol can have antiparasitic effects, there is not enough high-quality clinical evidence to conclude that eating cloves alone can eliminate intestinal parasites in humans.
In other words, cloves are scientifically interesting as a potential antiparasitic ingredient, but they should not replace medically recommended antiparasitic treatment when an infection has been diagnosed.
This distinction is especially important because studies may use concentrated extracts or essential oils at doses that are very different from the amount of cloves normally consumed as a spice.
5. Cloves May Support Oral Health
Cloves have a long history of traditional use for dental and oral problems.
Eugenol is particularly well known in dentistry and has been used in dental materials and preparations because of its analgesic and antiseptic properties. Research also indicates antimicrobial activity against microorganisms associated with oral health.
This helps explain why clove oil and clove-derived compounds have been used in some oral-care products.
However, undiluted clove essential oil should not be applied casually to the gums or swallowed, because concentrated essential oils can cause irritation and toxicity.
6. Cloves May Have Pain-Relieving Properties
Eugenol has demonstrated analgesic and antinociceptive effects in experimental research.
Traditionally, cloves have been used for toothache and other types of discomfort. Modern research continues to investigate eugenol because of its interaction with biological pathways involved in pain and inflammation.
For persistent or severe pain, however, the underlying cause should be evaluated rather than relying on cloves as a treatment.
7. Cloves and Blood Sugar: What We Know
Cloves and their bioactive compounds have also been investigated for possible effects related to glucose metabolism and diabetes.
Some experimental studies suggest that eugenol and other compounds in cloves may influence pathways associated with glucose regulation. However, evidence from human clinical trials remains insufficient to establish cloves as a treatment for diabetes.
Therefore, cloves can be part of a varied diet, but they should not replace prescribed diabetes medication or a medically recommended diet.
How to Use Cloves
Cloves are easy to incorporate into everyday foods.
- Tea and warm beverages
- Curries and savory dishes
- Rice dishes
- Soups and stews
- Baked goods
- Spice blends
- Marinades
- Fruit-based desserts
Clove tea is another traditional way to consume the spice. However, there is no established medical dosage of cloves that has been proven to prevent or eliminate disease.
Cloves vs. Clove Essential Oil
It is important not to treat culinary cloves and clove essential oil as the same thing.
Whole or ground cloves contain a relatively small amount of concentrated essential oil. Clove essential oil, on the other hand, is highly concentrated and contains a much higher concentration of eugenol.
Research showing antiparasitic or antimicrobial activity often involves concentrated extracts or essential oils, which cannot automatically be translated into the effects of eating a few cloves.
For this reason, more is not necessarily better.
Are Cloves Safe?
Used as a culinary spice, cloves are generally considered safe for most people.
However, concentrated clove oil can cause irritation and may be harmful if used incorrectly or taken in excessive amounts.
People who are pregnant, taking medications that affect blood clotting, have a medical condition, or are considering concentrated clove supplements should speak with a healthcare professional before using them medicinally.
Cloves should therefore be viewed primarily as a food and spice with promising biological properties—not as a cure-all.
The Bottom Line
Cloves are a flavorful spice containing eugenol and other bioactive compounds with antioxidant, antimicrobial, anti-inflammatory, analgesic, and potentially antiparasitic properties.
The research on cloves and parasites is particularly interesting. Laboratory and experimental studies suggest that clove extracts, essential oil, and eugenol can affect certain parasites, including Giardia and several parasitic worms.
But the evidence does not currently justify claiming that simply eating cloves will eliminate intestinal parasites in humans.
The most accurate conclusion is that cloves have promising antiparasitic activity in experimental research, while more human clinical studies are needed to determine whether and how they can be used therapeutically.
As a culinary spice, however, cloves can be a simple way to add distinctive flavor and a variety of plant compounds to the diet.
Frequently Asked Questions
How many cloves should I eat per day?
There is no scientifically established daily dose of cloves for general health or parasite treatment. Culinary use is different from taking concentrated clove extracts or essential oil.
Do cloves kill intestinal worms?
Laboratory studies suggest that clove compounds, particularly eugenol, can have activity against some parasites and worms. However, there is insufficient human evidence to say that eating cloves alone will eliminate intestinal worms.
Are cloves good for parasites?
Cloves have demonstrated potential antiparasitic activity in experimental studies. This is promising, but it should not be confused with proven treatment of parasitic infections in humans.
Can I drink clove tea every day?
Clove tea can be consumed as a traditional beverage, but there is no established therapeutic daily dose. Avoid excessive amounts and be particularly cautious with concentrated clove preparations.
What is the main active compound in cloves?
Eugenol is one of the main bioactive compounds in cloves and is responsible for much of their characteristic aroma and several of the biological activities studied in research.
Are cloves anti-inflammatory?
Research suggests that eugenol and other compounds in cloves have anti-inflammatory activity, particularly in experimental models. More human research is needed to determine the clinical significance of these effects.
Scientific References
Research on cloves has investigated their antioxidant, antimicrobial, anti-inflammatory and antiparasitic properties. Much of the evidence, particularly regarding parasites, comes from laboratory and experimental studies rather than large clinical trials in humans.
Disclaimer
This article is for informational and educational purposes only and should not be considered medical advice. Cloves and clove-derived products should not be used as a substitute for professional diagnosis or treatment. If you suspect a parasitic infection or another medical condition, consult a qualified healthcare professional.