Key takeaways
- Limonene is a cyclic monoterpene, C10H16, with a molecular weight of 136.23 g/mol.
- D-limonene is the common natural form and smells of fresh orange peel. It is the main component of sweet orange peel oil.
- It boils at about 175 to 178 C and has a flash point of 48 C, so it is a flammable liquid that needs careful handling.
- Limonene oxidises in air, so store terpene products tightly closed, cool and dark.
- Elite Terpenez sells citrus-led profiles in several lines. Their listed aroma notes describe the smell, not the contents.
- Never use a concentrated terpene undiluted. Test a small batch first and work from the calculator’s starting cuts.
What is limonene?
Limonene is a colourless liquid terpene made of ten carbon atoms. Chemists classify it as a cyclic monoterpene, which means it is built from two isoprene units arranged in a ring. Its formula is C10H16 and its molecular weight is 136.23 g/mol, according to PubChem’s limonene record.
The name comes from the lemon. The molecule is found in many plants, but it is most closely linked with citrus peel, where it sits in the oil glands of the rind. When you scratch an orange peel and smell the spray, limonene is the main thing you are smelling.
If you are new to the topic, our guide to what terpenes are covers the basics before the detail below.
What is d-limonene?
D-limonene is the right-handed mirror-image form of limonene, and it is the form most people mean when they say “limonene”. Limonene exists as two mirror-image forms, called enantiomers. D-limonene, also written (R)-(+)-limonene, is the one that dominates natural citrus oils. The left-handed form, l-limonene, is much rarer and is more often described as pine-like or turpentine-like.
The two forms have the same formula but a different 3D shape, and the nose can tell them apart. That is why a supplier might list one product as “limonene” with CAS 138-86-3 and another as “d-limonene” with CAS 5989-27-5. PubChem’s d-limonene record lists the d-form separately.
What does limonene smell like?
Limonene smells of fresh citrus peel. PubChem describes d-limonene as a clear, colourless liquid with a pleasant, lemon-like odour, and perfumers usually describe the d-form as closer to sweet orange than to sour lemon. The smell is bright, clean and slightly sweet.
How a limonene-led aroma reads depends on what sits beside it:
- Alone: orange peel, zest and a faint sweetness.
- With floral notes: a lemon blossom or bergamot-like character.
- With earthy or fuel notes: the sharp lemon seen in classic kush and haze flavours.
- With creamy or dessert notes: a sherbet or lemon-cream impression.
Where is limonene found in nature?
Limonene occurs in the peel oils of citrus fruit, in some herbs and conifers, and in many flowering plants. Citrus peel oils are the richest natural source. In one peer-reviewed analysis of sweet orange peel oil, d-limonene made up about 90.9% of the oil by gas chromatography, with linalool, octanal and myrcene as the next largest components. The same study found d-limonene at about 54.7% in lime oil.
These numbers are one study’s results, and peel oils vary with fruit variety, region and extraction method. You can read the original paper in PubMed Central.
Limonene also appears, usually in smaller amounts, in the cannabis plant. Lab reports on dried flower often list it among the commonly reported terpenes, alongside caryophyllene and myrcene. The Biscotti strain, covered in our Biscotti strain guide, is one example where limonene is commonly reported.
What are the key facts about limonene?
The table below puts limonene next to three other common terpenes so you can compare the numbers. Data comes from PubChem records for each molecule.
| Terpene | Class | Formula | CAS number | Boiling point | Aroma |
|---|---|---|---|---|---|
| Limonene | Monoterpene | C10H16 | 138-86-3 (d-form 5989-27-5) | About 175 to 178 C | Citrus peel, orange, lemon |
| Myrcene | Monoterpene | C10H16 | 123-35-3 | About 167 C | Earthy, musky, herbal |
| Alpha-pinene | Monoterpene | C10H16 | 80-56-8 | About 156 C | Pine, turpentine |
| Linalool | Monoterpenoid (alcohol) | C10H18O | 78-70-6 | About 198 C | Floral, lavender-like |
Three more figures are useful for handling. D-limonene has a density of about 0.84 g/mL, so it floats on water. It has a closed-cup flash point of 48 C. It is practically insoluble in water but mixes with ethanol and with oils.
How is limonene different from other citrus-smelling terpenes?
Limonene is the main citrus note, but it is not the only molecule that contributes to a citrus smell. Linalool adds a floral, lavender-like lift that rounds out orange oil. Myrcene adds an earthy, musky depth. Citral, found in lemon and lemongrass, is a separate aldehyde that gives a sharper, more lemon-candy character than limonene does.
That is why a “lemon” flavour built on limonene alone can taste flat. Flavourists typically build citrus from limonene plus supporting notes, and a good profile balances a bright top with some depth underneath.
How is limonene sourced?
Most commercial limonene is a by-product of the citrus juice industry. After the juice is pressed, the peel is squeezed or steam-distilled to recover the oil, and the oil is then refined to the specification a buyer needs. Because the starting material is a food-industry waste stream, d-limonene is one of the most widely available terpenes in the world.
In flavour and aroma work, limonene reaches a finished profile by one of three routes:
- Isolated from citrus oils: the single molecule, separated out and used as a building block.
- Present in a whole plant extract: limonene alongside the other terpenes the plant made, as in cannabis-derived terpenes (CDTs).
- Present in a botanical blend: limonene combined with other botanical-derived terpenes (BDTs) to recreate a target aroma.
Which route suits you depends on whether you want one clean citrus note or a layered, strain-like profile. A layered profile usually smells more natural, while an isolated citrus note is more predictable.
Which Elite Terpenez profiles have a citrus-led aroma?
Elite Terpenez sells many profiles with a citrus-led aroma, across the Premium, Classic Strains, DNA, Infused and Flavour Infused lines. We do not state the contents of any profile, so the table shows each profile’s listed aroma notes only. Profiles with a citrus-led aroma such as these are a good place to start:
| Profile | Line | Listed aroma notes |
|---|---|---|
| Super Lemon Haze | Classic Strains (BDT) | Fresh lemon, lemon peel, sweet citrus |
| Super Lemon Haze DNA | DNA Series | Sharp citrus, sweet lemon peel, fresh finish |
| Clementine | Premium Line (CDT) | Citrus, sweet, fresh |
| Orange Tree | Infused Terpenes (BDT) | Orange peel, citrus blossom, woody edge |
| Summer Lemon | Flavour Infused (BDT) | Sun-bright lemon, sweet and zesty, crisp finish |
For a bright, peel-led lemon, start with Super Lemon Haze. For a softer orange and mandarin direction, look at Clementine or Orange Tree. To browse more, see the Premium Line, the Classic Strains and the Infused Terpenes collections, or the full Flavour Catalogue.
For cannabinoid content of any profile other than the Diamond Line, contact us and we will confirm before you order. Diamond Line terpenes contain no THC or other cannabinoids.
What does limonene pair with?
Limonene is a good team player, and many popular flavours are citrus layered over something else. Use these pairings as a guide when you plan a blend or choose between profiles:
| Pair limonene with | Resulting impression | Example listed aroma notes |
|---|---|---|
| Vanilla and cream | Orange sherbet, creamsicle | Orange Creamsicle: orange sherbet, vanilla cream, sweet citrus |
| Candy and fruit | Lemon sweets, fruit chew | Lemon Runtz: zesty lemon, fruit candy, creamy finish |
| Earth and pine | Classic lemon kush | Lemon Kush: zesty lemon, earthy kush, pine base |
| Diesel and fuel | Sharp lemon with a gassy edge | Sour Diesel: citrus, sour, diesel |
These are separate profiles from the Elite range, each with its own listed notes. They show the direction of the pairing and say nothing about what any bottle contains.
How do makers use limonene for flavour and aroma?
Makers use limonene-led citrus profiles to give a product a fresh, bright top note. Citrus is one of the most requested directions in vape, beverage and confectionery development, because it reads as clean and familiar. It also pairs easily with sweet, creamy and fuel-like profiles when you want a lift.
A few practical points:
- Build, do not stack: pair a citrus profile with a sweet or earthy one to avoid a flat, single-note result.
- Start low: citrus notes are bright and fade first, but over-dosing can turn them harsh or soapy.
- Test small: run a small batch, wait a day, and re-smell it before scaling.
- Expect drift: limonene oxidises in air, and aged citrus can smell of turpentine or old peel.
What are the starting cuts and handling rules?
Terpene profiles are concentrated and must never be used undiluted. Elite Terpenez’s starting cuts are 6% for vape cartridges, 4% for concentrates, 2% for tinctures, 1% for edibles, 0.5% for beverages and 3% for topicals. Use the terpene mixing calculator to turn a percentage into a weight, and always test a small batch first.
Limonene has a notable hazard profile. PubChem’s classification lists it as a flammable liquid that irritates skin and can cause an allergic skin reaction in some people. Wear gloves and eye protection, keep it away from children, pets, heat and flames, and work in a ventilated space. For general workplace guidance, see the HSE’s COSHH basics. Products are for adults (18+) only.
Storage
Store terpene bottles tightly closed in a cool, dark place; refrigerated is ideal. PubChem notes that limonene oxidises in air, so a half-empty bottle left open will lose its freshness faster than a full, closed one. Decant what you need and reseal promptly.
Keep the bottle away from direct light, because light and warmth speed up oxidation. If a citrus profile starts to smell flat, resinous or like turpentine rather than fresh peel, it has probably aged, and it is better to test a fresh bottle than to adjust your recipe to compensate. Label the date you opened each bottle so you can track how long it has been in use.
Sizes and bulk
Profiles come in 2 ml, 5 ml and 10 ml bottles. For larger runs, ask about bulk on the wholesale and bulk page. Free UK delivery on orders over £80.
Frequently asked questions
What is limonene?
Limonene is a cyclic monoterpene with the formula C10H16, found mainly in citrus peel oils. It is a colourless liquid with a fresh orange and lemon smell, a CAS number of 138-86-3 and a boiling point of about 175 to 178 C. Makers use it as a flavour and aroma ingredient.
What does limonene smell like?
Limonene smells of fresh citrus peel. The common d-form is closer to sweet orange, while many people also read it as lemon-like. The rarer l-form is more often described as pine or turpentine. In a blended profile, limonene gives the bright, zesty top note rather than the base.
What is the difference between limonene and d-limonene?
Limonene is the general name for the molecule, which exists as two mirror-image forms. D-limonene is the right-handed form that dominates natural citrus oils and smells of orange. Suppliers sometimes use the two names loosely, so check the CAS number: 138-86-3 for limonene, 5989-27-5 for the d-form.
Where does limonene come from?
Limonene is mainly obtained from citrus peel oils, especially orange peel, where it can make up around 90% of the oil. It also occurs in smaller amounts in many herbs, conifers and flowering plants, including the cannabis plant. Amounts vary with variety, region and extraction method.
Is limonene flammable?
Yes. PubChem lists d-limonene as a flammable liquid with a closed-cup flash point of about 48 C. Keep it away from heat, sparks and flames, store it tightly closed and work in a ventilated space. Always follow the safety information supplied with your product and wear gloves and eye protection.
Which Elite Terpenez profiles have a citrus aroma?
Profiles with a citrus-led aroma include Super Lemon Haze and Super Lemon Haze DNA, Clementine, Orange Tree and Summer Lemon, across five lines. Each lists its own aroma notes on its product page. Elite Terpenez does not state the contents of its profiles, only their listed aroma notes and ingredients.
Which Elite Terpenez profiles are suggested for limonene, and what are their listed notes?
Start with Classic Strains Super Lemon Haze (fresh lemon, lemon peel, sweet citrus); Premium Line Clementine (citrus, sweet, fresh); Infused Terpenes Orange Tree (orange peel, citrus blossom, woody edge). Notes come from each product page, and every profile is sold in 2 ml, 5 ml and 10 ml bottles.
Ready to build a citrus flavour? Browse the Premium, Classic Strains and Infused ranges, order samples in 2 ml bottles, or contact us for bulk quantities and to confirm anything about a profile before you order.
