Cloves are the aromatic, unopened flower buds of the evergreen tree Syzygium aromaticum, belonging to the Myrtaceae family. Native to the Maluku Islands in Indonesia, they are widely recognized for their strong, warm flavour and medicinal properties.

Botanical and INCI Classification

• Scientific Name:Syzygium aromaticum (L.) Merr. & L.M. Perry.
• Synonyms:Eugenia caryophyllata, Eugenia aromatica, and Caryophyllus aromaticus.
• INCI Name:Eugenia Caryophyllus Bud Oil (specifically for clove bud essential oil).
• Family:Myrtaceae.

Parts of the Plant Used

While the unopened bud is the most common part used, other parts of the tree provide unique properties and oils:

• Flower Buds:Harvested when they turn from green to bright red; they are used whole, ground, or distilled into “Clove Bud Oil”.
• Leaves:Distilled to create “Clove Leaf Oil,” which is often used in industrial applications and is generally more cost-effective.
• Stems (Stalks):These are the slender stems of the flower clusters; they produce “Clove Stem Oil,” which has the highest concentration of eugenol.
• Fruit (Mother Cloves):The ripe, ovoid brown berries containing a single seed; they are considered a different spice form.

Health and Therapeutic Benefits

Cloves contain eugenol, a powerful bioactive compound responsible for most of their aroma and health effects.

• Antimicrobial and Antifungal:Cloves effectively stop the growth of bacteria such as E. coli and S. mutans, the latter of which causes dental cavities. They also show activity against various yeasts and fungi, including Candida albicans.
• Pain Relief (Analgesic):Cloves have long been used in traditional medicine as a natural numbing agent for dental emergencies and muscle pain.
• High in Antioxidants:They are rich in manganese and antioxidants that reduce oxidative stress, which is linked to chronic diseases.
• Blood Sugar Regulation:Some research suggests clove compounds help increase insulin secretion and improve the function of insulin-producing cells.
• Digestive and Bone Health:Animal studies indicate cloves may help treat stomach ulcers and improve bone mass, though human studies are still limited.

Common Uses

Cloves are versatile and used across culinary, industrial, and agricultural sectors:

• Culinary:Used as a spice in gingerbread, curries, meat marinades, and hot beverages like mulled wine.
• Oral Care:A frequent ingredient in toothpastes, mouthwashes, and temporary dental fillings due to its antiseptic and numbing properties.
• Cosmetics and Fragrance:Added to soaps, perfumes, and aromatherapy oils for its sweet, spicy scent.
• Agriculture:Clove bud powder acts as a natural “grain protectant” to prevent weevil infestations in stored maize.

Potential Side Effects and Safety

While generally recognized as safe (GRAS) for food use, high concentrations—especially in oil form—carry risks:

• Toxicity:Clove oil is unsafe to ingest in significant amounts; even small doses can cause liver damage, seizures, and fluid imbalances, particularly in children.
• Topical Irritation:Applying undiluted clove oil directly to the skin or gums can cause irritation, damage, or tissue necrosis.
• Bleeding Disorders:Eugenol can slow blood clotting, which may lead to increased bleeding during or after surgery.
• Drug Interactions:Cloves may interfere with medications used to manage blood sugar or blood thinners like warfarin.