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Quick answer: lemon myrtle essential oil is steam distilled from the leaves of Backhousia citriodora, an Australian tree in the myrtle family. It is one of the most intensely lemon-scented oils you can buy because it is typically dominated by citral (geranial plus neral). Tisserand and Young, in Essential Oil Safety (second edition), recommend a dermal maximum of 0.7 percent, caution against topical use on children under 2 and on damaged or hypersensitive skin, and note a possible CYP2B6 drug interaction and a teratogenicity concern. This is a perfume-strength leaf oil, not a bottle of lemon juice and not a medicine. Dilute it far more than you would a mild floral, and do not confuse it with lemongrass or with cold-pressed lemon peel oil.
Lemon myrtle smells like someone turned the lemon idea up further than citrus peel can go. That intensity is the pleasure and the safety problem in one. This guide is part of our essential oils guide and is meant to be used with the essential oil dilution chart. The closest comparisons on the site are lemongrass essential oil and cold-pressed lemon essential oil, which share a lemony first impression and then diverge in chemistry and limits.
Sources: Robert Tisserand and Rodney Young, Essential Oil Safety, second edition (2014), lemon myrtle profile (pp. 360-361), including constituents cited from I.A. Southwell, M. Russell, R.L. Smith et al., Journal of Essential Oil Research 12 (2000); National Association for Holistic Aromatherapy (NAHA); National Center for Complementary and Integrative Health (NCCIH) aromatherapy overview; Tisserand Institute general safety guidelines on dilution, baths, children and ingestion. Essential oils are not approved to diagnose, treat, cure or prevent disease. Talk with a healthcare provider before use if you are pregnant, nursing, have a medical condition or take medications.
Contents
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What Lemon Myrtle Essential Oil Is
Backhousia citriodora is a tree native to Australia, in the Myrtaceae family along with tea tree and eucalyptus, though its scent is not tea-tree-medicinal and not cineole-camphoraceous in the usual way. Distillers steam the leaves. The oil is clear to pale yellow, thin, and powerfully lemony.
The reason is citral: the pair of aldehydes geranial and neral. Tisserand and Young cite compositional work by Southwell and colleagues describing lemon myrtle as a superior natural source of citral. Retail explanations often say the oil can be mostly citral; AromaWeb, summarizing that literature, notes figures upwards of 96 percent in some analyses. Batch variation exists, so a current GC-MS is better than a single remembered number, but the practical takeaway is stable: this oil is aldehyde-heavy and should be treated as a high-risk skin sensitizer if it is not heavily diluted.
Other constituents listed in the Essential Oil Safety profile include isogeranial, isoneral, 6-methyl-5-hepten-2-one and linalool. Those minor compounds do not make the oil gentle.
Lemon myrtle the culinary herb, used as a dried leaf in Australian cooking, is not the same exposure as a drop of neat essential oil. Food use of the leaf and concentrated oil on skin or in a capsule are different categories. Do not scale a recipe up into a “wellness dose.”
| Feature | Lemon myrtle essential oil |
|---|---|
| Botanical name | Backhousia citriodora |
| Family | Myrtaceae |
| Plant part | Leaves, steam distilled |
| Aroma | Intense, sweet, “super lemon,” not peel-bitter |
| Dominant chemistry | Citral (geranial and neral) |
| Dermal maximum (Tisserand and Young, 2nd ed.) | 0.7% |
| Other cautions (same source) | No topical use on children under 2; avoid damaged or hypersensitive skin; possible CYP2B6 interaction; teratogenicity caution |
How It Smells and How It Differs From Other Lemon Oils
Lemon myrtle is sharper and more purely lemon-candy or lemon-leaf than most cold-pressed lemon peel oils, which are usually limonene-rich and can fade or oxidize into a different smell. It is often sweeter and “cleaner” than lemongrass, though both are citral oils and can remind you of each other. Compared with lemon eucalyptus, which is typically citronellal-forward rather than citral-forward, lemon myrtle is less citronella-bug-spray and more lemon-drop, still very strong.
Because the aroma is loud, blends need restraint. One drop can lead a formula. It can pair, at very low levels, with lavender, a soft wood, or a gentle floral, but stacking it with lemongrass, may chang or other citral oils raises the same sensitization budget. Treat citral as a shared limit, not a per-bottle allowance.
Phototoxicity is the issue people remember from bergamot and some cold-pressed citrus peels. Lemon myrtle is a leaf oil, not a expressed citrus peel, so you should not automatically copy bergamot sun rules onto it. The dominant risk here is citral irritation and sensitization, plus the pregnancy-related caution in Essential Oil Safety, not a classic bergamot-style furocoumarin story. You still do not slather experimental dilutions on skin and walk into harsh sun for fun; you just should not pretend the hazards are identical.
Safety and Dilution
Tisserand and Young’s 0.7 percent dermal maximum is the number to respect. That is 0.7 grams of essential oil per 100 grams of finished product, or roughly 4 drops per ounce of carrier if you use the common “20 drops per milliliter” estimate, and even that drop-count shortcut is approximate because drop size varies. Many people will prefer to stay lower, especially on the face or in leave-on products.
Essential Oil Safety also cautions:
- Against topical use on children and infants under 2
- Against use on hypersensitive, diseased or damaged skin
- That a drug interaction may occur with medicines metabolized by CYP2B6
- That there is a risk of teratogenicity, which is why pregnancy is a reason to get professional advice and, for many people, to choose a milder scent instead
General Tisserand Institute rules still apply. Leave the oil diluted, never neat on skin. A bath needs a proper dispersant if you use any essential oil at all; aldehyde-rich oils can be especially unpleasant as a film on the water. Ingestion is not a home remedy to try with lemon myrtle. Keep it away from eyes. Diffuse sparingly, with air, and not all day.
If you take prescription drugs, ask a clinician or pharmacist about CYP2B6 before regular use. If you are pregnant or trying to conceive, do not rely on a forum vote.
A patch test matters more with citral oils than with a mild lavender. Sensitization can appear after repeated use, not only on the first day. Once an allergy is established, you may need to avoid lemon myrtle, lemongrass, may chang and other citral-rich materials indefinitely.
Dilution Table and Scent Uses
| Use (healthy adults) | Starting point | Notes |
|---|---|---|
| Diffusion | 1 drop, short session | Very strong; ventilate |
| Leave-on body product | Well under 0.7%, often 0.25% to 0.5% | Stay at or below the 0.7% maximum |
| Face | Often skip, or a trace under 0.25% if you already tolerate citral | Easy to overdo |
| Cleaning-scent accent | A drop in a properly emulsified spray | Not a registered disinfectant |
| Bath | Only fully solubilized, very low dilution | Easy to irritate |
| Internal use | Do not self-prescribe | Culinary leaf is not a dose guide for the oil |
| Children under 2, topical | Do not use | Per Tisserand and Young |
Aroma can be uplifting in the ordinary sense that a bright lemon smell is cheerful. That is not a treatment for depression, infection or herpes, even though some older aromatherapy manuals list ambitious uses. Laboratory or traditional claims do not make a home treatment plan.
Lemon Myrtle vs Lemongrass, Lemon Peel and Lemon Eucalyptus
Lemongrass is another citral-rich oil, from a Cymbopogon grass, with its own (also low) dermal maximum in Essential Oil Safety. The two can substitute for each other in a scent blend only if you respect the stricter limit in the formula and accept that the smells are cousins, not clones. Lemon myrtle is often more sparkling and less grassy-fatty than lemongrass.
Cold-pressed lemon peel oil oil comes from citrus peel, is typically high in limonene, oxidizes readily, and has its own irritation and, depending on production, phototoxicity considerations. It will not smell as candy-lemon intense as myrtle leaf oil.
Lemon eucalyptus (Corymbia citriodora) is a citronellal story and is also easy to confuse in a shopping cart because of the word lemon. Check the Latin name every time.
May chang (Litsea cubeba), covered in a companion article in this batch, is yet another citral-rich oil, usually distilled from fruit. Same family of risk, different plant.
Buying and Storage
Look for Backhousia citriodora, leaf, steam distilled, and a GC-MS that shows citral as the dominant pair of constituents. Australia is the historic home of the tree; honest sellers state origin when they can. A cheap “lemon myrtle” that smells dull or mainly like solvent needs a second look.
Citral oxidizes and can become more irritating with age and air. Buy small bottles, close them tightly, store them cool and dark, and retire old stock from skin use. Keep child-resistant storage in mind; the pleasant candy-lemon smell is exactly the sort of thing a child might want to taste.
NCCIH’s aromatherapy overview is a good brake pedal: essential oils are concentrated, evidence for many health claims is limited, and side effects happen. Lemon myrtle earns a place as a beautiful, forceful scent ingredient when the math of dilution is done in daylight.
A Simple Way to Dilute 0.7 Percent Without Guessing
Percentages feel abstract until you put them on a kitchen scale. The most reliable method is weight: 0.7 grams of lemon myrtle in 100 grams of finished product is the Tisserand and Young dermal maximum, so a 50 gram bottle of lotion should contain no more than 0.35 grams of the essential oil, and many people will choose half of that for a leave-on cream. If you do not have a scale that can weigh small amounts of oil, make a tiny pre-dilution in a carrier, label it with the date and percentage, and only then add a measured spoonful of that pre-dilution to a larger unscented cream. Do not “eyeball a drop” into a whole jar and hope it landed under the limit.
Drop counting is a weaker backup. Drop size changes with orifice reducers, temperature and how hard you shake the bottle. If you use drops, stay conservative, write down what you did, and patch test the finished product, not only the neat oil on a cotton swab. Face products should be weaker than body lotions. Rinse-off soaps still contact skin, but they are often less of a sensitization burden than a daily leave-on oil; even then, there is no good reason to blow past 0.7 percent.
Label homemade products with the oil name, the percentage, and the date. Citral-rich oils change as they oxidize, so a lotion that was comfortable in March can be prickly in December if the same batch of oil has been opened repeatedly. When in doubt, make a fresh, smaller batch and retire the old bottle from skin use, keeping it only for a cautious sniff test or discarding it.
Frequently Asked Questions
Why is lemon myrtle diluted so much more than lavender?
Because it is typically dominated by citral, an aldehyde associated with skin sensitization. Tisserand and Young set a 0.7 percent dermal maximum.
Can I use lemon myrtle if I am pregnant?
Essential Oil Safety flags a teratogenicity concern for this oil. Get personal advice from your clinician, and consider choosing a milder aroma instead of experimenting.
Is lemon myrtle the same as lemon essential oil?
No. Lemon myrtle is a distilled Australian leaf oil from Backhousia citriodora. Lemon essential oil is usually cold-pressed from citrus peel.
Can I put lemon myrtle in a diffuser around children?
Use great caution, keep sessions short and ventilated, and do not use it topically on children under 2. If a child has respiratory issues, skip diffusion and ask a clinician.
Does lemon myrtle repel mosquitoes?
Do not assume a diffuser oil matches a registered insect repellent. For disease-risk bites, follow public-health guidance on registered products rather than a homemade citral blend.
How should I store it?
In a tightly closed dark glass bottle, away from heat, light and children, and only in amounts you will use before the scent turns harsh.
