Clove: Dangers, Side Effects and Real Contraindications

"Clove dangers" and "clove side effects" deserve a clear distinction from the start: in culinary use (1 to 3 cloves in a dish or a drink), clove is safe for the vast majority of people. The real risk concentrates on the essential oil, very high in eugenol, which demands careful supervision and has nothing to do with the whole spice.

This guide carefully separates these two uses to avoid any dangerous confusion.

Clove dangers: what is actually claimed?

Ayurvedic tradition uses clove (lavanga) as a digestive stimulant and oral antiseptic, in very small doses. That traditional caution is justified: it's one of the most concentrated spices there is, and its potency calls for micro-doses, particularly for concentrated preparations.

Side effects of the culinary spice

• Mouth or digestive irritation from overdosing — beyond a few cloves a day.
• Transient local burning sensation if a whole clove is left against the gum for too long.
• Possible worsening of acidity in people prone to heartburn, since clove is a heating spice.

These effects remain rare and mild at usual culinary doses.

Essential oil: the real point of danger

Population	Risk	Recommendation
Children	Mucosal toxicity and irritation, heightened risk in young children	Forbidden in any form without professional supervision
Pregnant and breastfeeding women	Insufficient safety data	Avoid without medical advice
Undiluted skin application	Irritation, even burns to mucous membranes and skin	Always diluted, never on a fragile mucous membrane
Oral ingestion	Possible liver toxicity at excessive doses	Never swallowed without professional supervision

This distinction is essential: most worries around clove's "danger" stem from confusing the whole culinary spice, safe at small doses, with the essential oil, a far more concentrated product that follows entirely different safety rules.

Drug interactions

Eugenol has a theoretical antiplatelet effect at high doses: people on blood-thinning treatment or preparing for surgery should mention any significant clove intake to their doctor, and stick to modest food doses before an operation.

Clove and pregnancy

Culinary doses (a few cloves in a dish or a drink) pose no known problem during pregnancy and breastfeeding. On the other hand, concentrated extracts and essential oil should be avoided without medical advice, for lack of data specific to these periods.

Precautions and safety

• Essential oil: never for children, never undiluted, never taken orally without supervision.
• Blood thinners and scheduled surgery: mention any significant clove intake to your doctor.
• Sensitive stomach or reflux: reduce the dose, prefer a less heating spice such as cardamom.
• Pregnancy and breastfeeding: culinary doses accepted, extracts and essential oil to avoid.

For an overview of the precautions worth knowing before any concentrated herb or essential oil use, see our safety and precautions guide. A persistent toothache always calls for a dentist, never prolonged self-treatment with spices.

How to enjoy clove while limiting the risks

Stick to culinary micro-doses — 1 to 3 cloves a day in drinks and dishes — and reserve the essential oil for professionally supervised use. Homemade masala chai remains the simplest and safest way to enjoy it every day.

Side effects in detail

Does clove cause side effects? At usual culinary doses (1 to 3 cloves a day), rarely, and only minor discomfort: mouth irritation, a local burning sensation, worsening of existing acidity. The serious point of caution concerns a very different, far more concentrated form: essential oil, for which a published clinical case precisely documents the liver risk of excessive ingestion, particularly in children.

This article details the known side effects, from the most common and mild to the rarest and most serious, with the scientific source behind each. For benefits and uses, see our fact sheet clove; for a broader view of risks and at-risk groups, our article clove dangers complements this page.

The most frequent side effects stay mild

• Mouth or digestive irritation: the most commonly reported, with overdosing of the spice — beyond a few cloves a day.
• Transient local burning sensation, if a whole clove is left against the gum too long.
• Worsening of acidity or reflux in people already sensitive: clove is a very warming spice, one that easily aggravates the Pitta dosha.
• Skin reactions with external use: rare irritation with essential oil applied without sufficient dilution.

For the vast majority of people consuming the whole spice at a moderate dose, these effects stay mild and reversible on stopping or lowering the dose.

The documented case: acute hepatitis after essential oil ingestion

This is the reference study on clove's serious toxicity. Janes, Price and Thomas, in a 2005 article published in the European Journal of Pediatrics, described the case of a 15-month-old boy who ingested about 10 ml of clove essential oil. The child developed fulminant acute liver failure, with transaminases (ALT) exceeding 13,000 U/l within 24 hours, along with associated kidney involvement. The clinical picture, close to that of an acetaminophen overdose, is explained by eugenol's toxicity mechanism, which depletes the liver's glutathione reserves at high dose. The good news: treatment with N-acetylcysteine (the antidote used for acetaminophen poisoning) led to gradual improvement in liver function within days.

Three clarifications put this risk in perspective: this case, and others published in the literature, consistently involve ingestion of concentrated essential oil, not the whole spice used in cooking; the volumes involved (several milliliters) have nothing to do with a clove chewed or simmered into a dish; and the outcome, with appropriate treatment, was favorable. This warrants real caution around essential oil — particularly keeping it out of children's reach — not concern over the culinary spice.

Who should be especially cautious?

Situation	What the literature shows	What to do
Young children	Liver toxicity documented from just a few milliliters of ingested essential oil	Essential oil off-limits for children, kept systematically out of reach
Known liver disease	Eugenol's liver-toxicity mechanism identified at high dose	Avoid essential oil; moderate culinary spice has no specific warning signal
Anticoagulant treatment	Eugenol's platelet anti-aggregant effect shown in laboratory work	Report any significant, regular consumption to your doctor
Unusual symptoms after accidental ingestion	Intense fatigue, vomiting, altered consciousness: warning signs	Seek emergency care, contact a poison control center

Interactions and effect on clotting

Beyond the liver, eugenol has a platelet anti-aggregant effect shown by laboratory work on clove and its main compound: at high concentration, it slows platelet aggregation through a mechanism distinct from aspirin's. At culinary doses, this effect stays theoretical with no known consequence. It still justifies a simple precaution: people on anticoagulant treatment or preparing for surgery should report any significant clove consumption — spice or essential oil — to their doctor.

Pregnancy, breastfeeding and children: caution still applies

Culinary doses (a few cloves in a dish or drink) pose no known problem during pregnancy and breastfeeding, as detailed in our article clove and pregnancy. Essential oil, however, should be avoided entirely by pregnant or breastfeeding women, and even more so around children, where the clinical case above concretely illustrates the danger of accidental ingestion.

Whole spice or essential oil: keep the two clearly separate

Most concerns about clove's side effects come from confusing two very different products. The whole clove, used in cooking at a rate of 1 to 3 a day, releases a modest, gradual amount of eugenol. Essential oil concentrates this same compound at considerably higher levels: a few milliliters are enough to reach the doses linked to the serious cases published in the literature. If a healthcare professional or aromatherapist recommends its use, it should always be taken heavily diluted, never applied undiluted to skin or a mucous membrane, and never taken orally without precise dose supervision. It should be stored in a dropper bottle, out of children's reach, like any concentrated product that is potentially toxic.

When to seek care

Seek care without delay for essential oil ingestion by a child, even in a small amount, or for vomiting, intense fatigue or altered consciousness after significant exposure to clove in any form. Clove, whether spice or oil, never replaces prescribed treatment or medical advice. General safety guidelines for Ayurvedic herbs and essential oils are detailed in our safety and precautions guide.

Pregnancy and breastfeeding: the full picture

Clove (lavanga) used as a culinary spice, a few cloves a day in a dish or a drink, raises no identified problem during pregnancy. The question looks very different for essential oil, highly concentrated in eugenol, whose risks our article on clove dangers and precautions already details even outside the context of pregnancy.

Culinary spice and essential oil: two products, two logics

Form	Assessment during pregnancy
Whole clove in a dish or drink	No known problem at usual culinary doses
Ground clove in cooking	No particular concern at usual dietary amounts
Concentrated capsule extracts	Insufficient data; medical advice recommended out of caution
Clove essential oil	Best avoided without medical advice, including diluted on the skin

Why concentrated eugenol calls for particular caution

Eugenol, the aromatic compound behind clove's properties, has a theoretical antiplatelet effect at high dose. A classic 1993 study by Saeed and Cheng-Che, published in Prostaglandins, Leukotrienes and Essential Fatty Acids, isolated eugenol and acetyl eugenol from clove oil and found them more potent than aspirin at inhibiting platelet aggregation induced by arachidonate, adrenaline and collagen. That effect is already flagged for people on blood-thinning treatment or ahead of surgery; the same caution extends to pregnancy by analogy, since essential oil, far more concentrated in eugenol than a culinary spice, lacks reassuring data for this period and is therefore best avoided without professional supervision.

Clove for toothache during pregnancy

Dental pain can appear or worsen during pregnancy. The traditional gesture of placing a whole clove against the sore gum, used occasionally for no more than a few minutes, is not specifically called into question by pregnancy. It remains a temporary stopgap, though: dental pain during pregnancy calls for a dental consultation, and routine dental care remains entirely possible at this time.

What about during breastfeeding?

Usual culinary doses raise no known problem during breastfeeding, as with pregnancy. Essential oil and concentrated extracts remain, here too, best avoided without medical advice, following the same precautionary logic applied to all concentrated essential oils on this site.

A warming spice to moderate in case of reflux

Clove is a pungent, warming spice that may worsen gastroesophageal reflux or heartburn already common during pregnancy. Pregnant women prone to these symptoms do well to limit it, independent of any question specific to pregnancy itself.

Precautions

In summary: cooking with clove during pregnancy, in the usual small amounts, carries no identified risk. It is essential oil concentrated in eugenol that should be avoided without medical advice during this period, as with most essential oils on this site. For more, see our guide on Ayurveda and pregnancy and our safety and precautions guide.

Dosage: usual amounts and duration

Clove dosage follows a simple rule: it is one of the most concentrated spices in the pantry, so it is one of those where the dose makes all the difference. Our article clove: benefits covers its dental and digestive uses; this one details how much to take, form by form, without ever exceeding reasonable culinary use.

How many cloves per day?

Use	Guideline dose	How
Chai and hot drinks	1 to 2 cloves per cup	Crushed, simmered with the other spices
Simmered dishes (rice, dal, curries)	2 to 3 cloves per pot	Whole in the tadka, removed before serving
Ground powder	A pinch on a knife tip	In spice blends, never by the spoonful
Breath and digestion	1 clove after a meal	Chewed slowly

Overall, both tradition and caution converge on a maximum of 1 to 3 cloves per day for a healthy adult, across all culinary uses combined. Beyond that, clove overwhelms other flavors and can irritate the stomach, with no demonstrated additional benefit.

Dental use: what dose for a toothache?

The traditional gesture is limited to a single whole clove, placed against the sore gum and chewed gently to release its eugenol. It is a one-off stopgap, not a treatment repeated several times a day: a tooth pain that persists beyond a few hours, or comes with fever or swelling, needs a dentist without delay. This use is not purely folk wisdom either: a randomized trial by Alqareer, Alyahya and Andersson, published in 2006 in the Journal of Dentistry, compared homemade clove gel, 20% benzocaine gel and matching placebos as topical anesthetics before a needle stick in 73 adults, and found both clove and benzocaine gels produced significantly lower pain scores than placebo. Never apply pure clove essential oil to the gum: too concentrated, it irritates and can burn the mucosa.

How long can it be taken regularly?

At the culinary doses described above, no particular duration limit applies to clove in everyday cooking, as with most spices in the Indian repertoire. The nuance concerns concentrated forms: standardized capsules or extracts should only be used in a short course, on a professional's advice, and never as prolonged self-medication.

Should the dose be adjusted to your dosha?

Clove is pungent and heating: Kapha and Vata profiles tolerate it well at the guideline dose above, while Pitta profiles and people prone to acidity or digestive inflammation do better staying at the low end of the range, or occasionally swapping it for cardamom or coriander, which are more cooling.

Precautions related to dosage

• Essential oil: never undiluted, never swallowed, never in children; reserved for use supervised by a qualified professional.
• Pregnancy and breastfeeding: culinary doses are acceptable; concentrated extracts and essential oil should be avoided without medical advice.
• Blood thinners: mention any significant, regular consumption to your doctor, especially before surgery.
• Sensitive stomach: in case of burning or reflux, reduce the dose or space out intakes.

Our safety and precautions guide details situations that call for extra vigilance.

Clove alone or in blends

For digestive or wintertime use, clove is traditionally paired with cinnamon and cardamom in masala chai, which lets you lower the individual dose while still enjoying the warming effect of the blend. That is often the best way to take it regularly without exceeding the small recommended amount.