Educational information, not medical advice — ask your doctor or midwife.
Backhousia myrtifolia is an Australian rainforest tree whose dried leaves are sold as a spice. You may see it called cinnamon myrtle, grey myrtle or carrol. It is used for flavour, not as a proven medicine.
The leaf smells warm and sweet. Many people say it is close to cinnamon or clove. Cooks use it in baking, sauces, spice rubs and tea blends.
A strong essential oil is also pressed from the leaf. That oil is a very different product from the kitchen spice, and it is much stronger. It is used mainly in perfume and flavouring work.
Here is the honest evidence verdict. There are no human trials showing that this plant treats or prevents any illness. Long use as a food does not prove a health effect, and it does not prove that strong doses are safe.
No one has shown how this plant acts in the human body, because the human studies have not been done.
Most of what exists is laboratory work on the leaf oil. In test tubes, the oil slows the growth of some bacteria and fungi. Whether it does anything useful inside a person is not known.
Some lab tests also report antioxidant activity, meaning the oil mops up reactive molecules in a dish. That result is common to many spice oils. It does not tell you what happens after you eat it.
The main compound in many samples is elemicin. It belongs to the same chemical family as myristicin, found in nutmeg. In animals, large doses of compounds in this family can affect the nervous system and the liver.
That is a reason for care with concentrated oil. It is not a reason to fear a pinch of the leaf in a cake.
Most people meet it as a kitchen spice. The common forms are:
- Whole dried leaf, used like a bay leaf and removed before serving. - Ground leaf powder, sold in bushfood and gourmet ranges. - Loose leaf for tea or infusions, often blended with other native herbs.
- Steam-distilled essential oil, sold for perfume and flavour use. - Flavour extracts used by food makers in drinks, sweets and sauces.
It is rarely sold as a capsule or tablet. If you find one, treat it as an untested product rather than a tested remedy.
Backhousia myrtifolia grows in the coastal forests of New South Wales and Queensland. Aboriginal peoples of eastern Australia knew the tree, and its hard timber was put to practical use.
Written records of the leaf being used as a medicine are thin. What is better recorded is the wood and the plant's place in local forest knowledge.
The leaf became a commercial spice much later. Australian bushfood growers brought it to market from the 1980s onward. Most of its modern reputation comes from cooking and from chefs, not from healers.
Stop using it and see a doctor if you get a rash, mouth swelling or stomach pain that does not settle.
Get emergency help straight away if you have trouble breathing, swelling of the face or throat, or you feel faint. These can be signs of a serious allergic reaction.
Call your local poison centre at once if anyone swallows the essential oil, especially a child. Take the bottle with you.
In Australia it is an ordinary food. The dried leaf is sold freely as a native spice and herbal tea. In the United States and the European Union it appears mainly as a flavouring ingredient rather than a licensed medicine, and no health claim is approved anywhere.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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