Herb reference

Nutmeg

Myristica fragrans Houtt.

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This library is designed to help readers orient, compare, and research. It is not a substitute for medical care or practitioner judgment.

Botanical / editorial

Family: Myristicaceae
Plant type: Evergreen tree
Route: Mixed route
Evidence tier: Mixed evidence

Banda Islands (Moluccas), Indonesia3500+Myristicaceae

Botanical / meta

Botanical identity

Botanical description

An aromatic evergreen tree reaching 5–15 m in height (up to 20 m in cultivation), with dark green, glossy, elliptical leaves 5–15 cm long. The tree is dioecious (separate male and female trees), though some cultivated varieties produce perfect flowers. Yellow, peach-like fruits split open when ripe to reveal the glossy brown seed (nutmeg) encased in a bright red, lacy aril (mace). The seed kernel is the nutmeg of commerce, with a hard black shell and papery seed coat surrounding the aromatic kernel.

Pharmacognosy intro

Nutmeg contains 25–40% fixed oil (nutmeg butter) and 5–15% volatile oil. The volatile oil consists primarily of monoterpene hydrocarbons (pinene, camphene, dipentene), oxygenated monoterpenes (1,8-cineole), and phenylpropanoids — most notably myristicin (1-allyl-5-methoxy-3,4-methylenedioxybenzene, up to 13% of the oil) and elemicin. Myristicin is the primary psychoactive and toxic constituent. It is metabolized in the body to 3-methoxy-4,5-methylenedioxyamphetamine (MMDA), an amphetamine-like compound responsible for nutmeg's deliriant effects at high doses. The fixed oil contains myristic acid as a major component.

Editorial orientation

The practical read

Body-first read

What it is for

Route panel

Preparation shapes the claim

Evidence and safety may differ by preparation. Essential oil, tea, tincture, extract, infused oil, and topical use are not interchangeable.

Mixed route

Quality

Fresh, dried, oil, and garden read

Growing tips

Nutmeg trees require a tropical climate with consistent rainfall (1500–2500 mm annually), warm temperatures (20–30°C), and high humidity. They grow best in deep, well-drained, volcanic loam with partial shade. Trees begin producing fruit 7–9 years after planting and reach full production after 20 years. Dioecious — both male and female trees required for fruit production (or select hermaphroditic cultivars). Extremely difficult to cultivate outside tropical regions. Not feasible for home cultivation in temperate climates.

Quality notes

Whole nutmeg seeds retain their flavor far longer than pre-ground nutmeg — grind fresh as needed using a microplane or nutmeg grater. Quality whole nutmeg should feel heavy for its size and have no mold or insect holes. The kernel should be mottled light and dark brown. Mace (the aril) has a similar but more delicate flavor. Available as whole seeds, pre-ground powder, and essential oil (the latter is toxic and not for culinary use). Store whole nutmeg in an airtight container; ground nutmeg loses potency within 6 months.

Companion

Crystal pairing reference

Crystal side

Companion crystal

The deeper layer

Compound and clinical layer

Clinical and compound notes are included as a research layer, not as treatment instructions.

Safety intro

HIGH RISK — NUTMEG IS TOXIC IN QUANTITIES ABOVE CULINARY DOSES. Consumption of 2+ teaspoons (approximately 5–15 grams) of ground nutmeg can cause severe intoxication including anticholinergic symptoms, delirium, hallucinations, tachycardia, nausea, vomiting, agitation, confusion, dry mouth, urinary retention, and hypertension. Fatalities have been reported at doses of 20+ grams. Myristicin is metabolized to compounds with amphetamine-like activity. The onset of intoxication is delayed 3–6 hours after ingestion. Contraindicated in pregnancy and breastfeeding — myristicin crosses the placental barrier and may have abortifacient properties at high doses. Contraindicated in individuals with seizure disorders. May interact with MAO inhibitors and CNS-active medications. The essential oil is highly toxic and should not be ingested. Emergency medical attention should be sought for suspected nutmeg intoxication. CULINARY USE IN RECIPE AMOUNTS IS SAFE; DO NOT CONSUME LARGE QUANTITIES.

Questions

Frequently asked about Nutmeg

What are the critical safety warnings and drug interactions for nutmeg?

Nutmeg is toxic in quantities above culinary doses because myristicin, a phenylpropanoid reaching up to 13% of the volatile oil, is metabolized in the body to MMDA (3-methoxy-4,5-methylenedioxyamphetamine), an amphetamine-like deliriant. Ingestion of roughly 5 to 15 grams (about 2 or more teaspoons) can cause delirium, hallucinations, tachycardia, anticholinergic symptoms, agitation, and vomiting, with onset delayed 3 to 6 hours; fatalities are documented at 20 or more grams. It is contraindicated in pregnancy and breastfeeding because myristicin crosses the placental barrier and may have abortifacient activity at high doses, and it is contraindicated in seizure disorders. It may interact with MAO inhibitors and other CNS-active medications. The essential oil is highly toxic and must never be ingested, though culinary use in recipe amounts is safe.

How is nutmeg prepared and dosed for culinary use?

Whole nutmeg seed is freshly grated as needed, with typical recipe amounts measured in fractions of a teaspoon per dish rather than by the teaspoon. Freshly grated nutmeg is dramatically more aromatic than pre-ground because the volatile oil (5 to 15% of the seed) oxidizes quickly once the seed surface is broken. There is no safe medicinal internal dose: because the gap between a culinary pinch and a toxic 5-gram threshold is narrow, nutmeg should be treated strictly as a flavoring spice. The fixed oil (nutmeg butter, 25 to 40% of the seed) and the essential oil are external or industrial products and are not for ingestion.

How do you identify high-quality nutmeg?

Whole seeds should be heavy, dense, and oily, releasing a warm, sweet, resinous aroma when scratched; lightweight or shriveled seeds have lost volatile oil. A fresh seed grated open shows a marbled tan-and-brown interior that feels slightly waxy from its high fixed-oil content. Pre-ground nutmeg loses potency rapidly and is more prone to adulteration, so whole seeds graded for soundness are preferable. Avoid seeds with insect bore-holes or any musty smell, which indicates age or poor storage.

How does nutmeg differ from mace, and why does it matter?

Nutmeg and mace come from the same fruit of Myristica fragrans: nutmeg is the inner seed kernel, while mace is the lacy crimson aril that surrounds the seed. Both share the myristicin and elemicin volatile-oil profile, so mace carries the same psychoactive and toxic potential at high doses and is not a safer substitute. Mace tends to have a more delicate, slightly more pungent flavor and is often preferred where the dark flecks of grated nutmeg are undesirable. Because the active phenylpropanoids are common to both, the same dose cautions apply to either form.

How should nutmeg be stored to preserve potency?

Whole nutmeg seeds keep their aroma for two to four years when stored airtight in a cool, dark place, far outlasting ground nutmeg, which fades within several months as the volatile oil dissipates. The high fixed-oil content (nutmeg butter) means ground material can eventually turn rancid, so grinding only what is needed preserves both flavor and freshness. Keep seeds away from heat and humidity, which accelerate oil loss and invite mold. A seed that no longer smells strongly resinous when scratched has lost most of its aromatic value.

Sources & Citations

Where this entry can be checked

Peer-reviewed sources for the pharmacological and clinical claims on this page. Crystalis herb entries describe tradition and current research; they are reference, not medical advice.

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SAFETY
Nutmeg (myristicin) poisoning - report on a fatal case and a series of cases recorded by a poison information centre
Stein U, Greyer H, Hentschel H. (2001). Nutmeg (myristicin) poisoning - report on a fatal case and a series of cases recorded by a poison information centre. Forensic Science International. [SAFETY]DOI 10.1016/S0379-0738(00)00369-8

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