Citrus Essential Oil Benefits: Uses for Immunity, Mood, Metabolism & Home

QUICK SUMMARY

Citrus essential oils are pressed or distilled from the peels of lemon, lime, sweet orange, grapefruit, bergamot, mandarin, tangerine and yuzu, and most of them are rich in d-limonene. In human trials, bergamot and orange aromas lowered anxiety, lemon inhalation eased nausea in pregnancy, and grapefruit and bergamot inhalation lowered PMS symptoms, including appetite changes; in the home, lemon and orange are the workhorses of DIY cleaning.

Cold-pressed bergamot, grapefruit, lemon, lime and bitter orange are phototoxic on skin, while sweet orange, mandarin, tangerine, yuzu, bergamot FCF and steam-distilled lemon and lime are not; after a phototoxic oil, keep that skin out of direct sun for 12 hours.

Citrus fruits are like the sunshine of the produce world, and citrus essential oils are just as bright. They are colorful and fresh, the perfect sign that summer is here and a beautiful reminder of God’s generous design in creation.

Citrus oils are simple enough for beginners but powerful enough to deserve respect. Here is what citrus oils are, how the five most popular ones differ, which ones are phototoxic, and which one to reach for. Each oil also has its own full guide, linked in the comparison below.

What Are Citrus Essential Oils?

While most essential oils are produced via steam distillation, citrus oils usually are not. The oil comes from the fruit peel, not the leaves, bark or seeds. If you have ever been sprayed in the eye when peeling an orange, you have already met citrus oil.

Most citrus oils are cold pressed, which means the peel is pressed by hand or machine with no heat or solvent, a process also called “expression.” Lemon and lime oils can also be steam distilled, and steam distillation removes the non-volatile furocoumarins that cause phototoxicity. (1)

This distinction matters. Cold-pressed oils smell closest to the fresh peel, but they carry those non-volatile compounds, which is why the same oil can be phototoxic when pressed and safe in the sun when distilled. (1)

A note to remember about citrus essential oil: we often think thick-peeled fruits are safer when grown conventionally because the peel protects the fruit. The opposite is true here, because the peel is in constant contact with sprays, so the concentrated oil could carry residues. Choose citrus oils that are organically grown or carefully tested.

Citrus Oils Compared: Which One to Choose

All five of the popular citrus oils smell cheerful and clean, but they are not interchangeable. Here is how they differ and where each one shines.

Quick picks: reach for sweet orange when you want calm, bergamot when stress is high or sleep is poor, lemon for queasiness and the kitchen, grapefruit when cravings and PMS are the struggle, and lime when you want a crisp, energizing room.

Beyond the big five, mandarin, tangerine and yuzu are gentle, non-phototoxic choices, and blood orange is a sweet orange (Citrus sinensis). Bitter orange (Citrus aurantium) is different: its pressed peel oil is phototoxic, and the same tree gives us neroli from its blossoms. Kaffir lime (Citrus hystrix) is not true lime, so check the label carefully.

Which Citrus Oils Are Phototoxic?

Some cold-pressed citrus oils contain furanocoumarins such as bergapten. When bergapten is left on the skin and the skin then meets UV light, it amplifies the sun’s effect and can leave a sunburn or dark spots where the oil was applied. (2)

When researchers measured these compounds in 12 cold-pressed citrus oils in 2022, expressed Italian bergamot carried the most, and levels varied by variety and origin. (1) Distilled oils carry next to none: the distilled yuzu oil in that study had less than 0.001 ppm. (1)

Photosensitizers

Non-Phototoxic Citrus Oils

Safety Tip: Cold-pressed bergamot, grapefruit, lemon, lime and bitter orange oils are known to be phototoxic, so if you apply them to your skin, choose steam-distilled lemon and lime or bergamot FCF, or avoid direct sunlight for at least 12 hours if your skin is prone to a photosensitive reaction.

You do not have to give up the pressed oils. Apply them at night, use them in the diffuser, or stay under the leave-on limits below. Remember, even with non-phototoxic citrus, it is still good practice to dilute according to appropriate dilution guidelines whenever using in topical applications.

The Essential Oil Safety text sets these maximums for leave-on products used on sun-exposed skin, and a 2018 safety review of citrus oils lists the same limits: (3)

• Cold Pressed Bergamot (Citrus bergamia): 2.4 drops (I just consider this 2 drops per oz). Dilution limit: 0.4%
• Cold Pressed Lime (Citrus aurantifolia): 4.2 drops (I just consider this 4 drops per oz). Dilution limit: 0.7%.
• Expressed Bitter Orange (Citrus aurantium): 7.5 drops per oz. Dilution limit: 1.25%.
• Cold Pressed Lemon (Citrus limon): 12 drops per oz. Dilution limit: 2%
• Cold Pressed Grapefruit (Citrus paradisi): 24 drops per oz. Dilution limit: 4%.

If you use more than one phototoxic citrus oil in a blend, the effects add up, so the combined amounts must stay within one oil’s limit. (4)

A 2021 cosmetic safety panel made the same point for leave-on products, capping their bergapten at 15 ppm and warning that several citrus ingredients can add up. (4) Our dilution chart shows how many drops fit each percentage.

What the Research Shows

Citrus oils are some of the most studied oils in the aromatherapy literature, and the strongest human evidence sits with what happens when you breathe them in. Here is what the research says, oil by oil.

Calm, Mood and Anxiety: Bergamot and Orange

In our book, The Essential Oils Apothecary, we call citrus oils “literally liquid antidepressants,” and the trials keep backing that up. A 2023 network meta-analysis pooled 44 randomized trials and 3,419 people with anxiety; bitter orange (Citrus aurantium) ranked as the most effective oil for lowering trait anxiety, and lemon also lowered it. (5)

Bergamot is the citrus oil researchers keep returning to for stress. In a 2026 trial at Hoshi University in Tokyo, 57 students kept aroma stones scented with bergamot for the three days before their exams, and their anxiety scores were significantly lower than the control group’s on all three days, with no side effects. (6) The same team had 48 students use a bergamot spray before bed and on waking for a week, and they woke more refreshed, slept longer, and scored lower on depression, anxiety and stress. (7)

At West Virginia University, 100 adults in outpatient treatment for substance use disorder were randomized to standard care or standard care plus a bergamot inhaler three times a day for seven days. The bergamot group reported more ease and lower depression and anxiety scores, and their intention to keep using the inhaler was high. (8)

Sweet orange earns its place too. In a 2025 Brazilian trial, 84 women in labor inhaled sweet orange oil or water; the orange group had less pain and less anxiety, along with lower blood pressure, heart rate and breathing rate. (9) Across four German dental offices and 486 patients, diffusing sweet orange, a lemon, lime and orange blend, or two pine blends lowered acute anxiety slightly overall, with clear effects in women and in the most anxious patients. (10)

Our own experience matches the studies. As we wrote in the same book, “After about ten minutes of aromatherapy with orange essential oil, we both feel that our bodies are less tense, our minds are no longer racing, and we feel calm.”

Nausea: Lemon

Lemon is the citrus oil for an unsettled stomach. In a landmark 2014 double-blind trial from Tabriz, Iran, 100 pregnant women with nausea and vomiting inhaled lemon oil or a placebo as soon as they felt queasy, and the lemon group had significantly less nausea and vomiting by days two and four. (11)

A 2026 systematic review in the Journal of Midwifery & Women’s Health gathered five studies of lemon aromatherapy in pregnancy and found that most reported significant drops in how often and how badly women felt sick; the authors called lemon aromatherapy a potentially “effective and safe complementary therapy.” (12) Inhalation is the route those studies used, and it is the one we recommend in pregnancy; see our nausea relief roll-on for more ways to use it.

Appetite, Cravings and PMS: Grapefruit and Bergamot

In a 2025 randomized trial from Turkey, 90 women with PMS smelled grapefruit oil, bergamot oil, or a placebo for 30 minutes three times a day in the days before their periods, for three cycles. Both citrus oils lowered total PMS scores, including the appetite-change scores; grapefruit also eased bloating, fatigue, sleep changes and menstrual pain. (13)

The appetite connection has a long history. In a landmark 2003 study, the scent of grapefruit and lemon oil increased sympathetic nerve activity to fat tissue in rats, which the researchers linked to fat breakdown and less weight gain. (14)

A 2025 study in mice points the same way. After seven weeks of breathing bitter orange oil, the mice carried less body fat for their weight, less liver fat, and lower cholesterol and triglycerides, even though they ate no less. (15)

No oil replaces good food and movement, but grapefruit makes a great partner to both.

Natural Cleaning: Lemon, Lime and Orange

Lemon oil is our first pick for the kitchen. A 2024 laboratory study found that lemon oil was 60.7 percent limonene, had antibacterial activity, and showed strong activity against Salmonella biofilms grown on glass and stainless steel. (16) In another 2024 lab study, peel oils of grapefruit, lime and orange were active against every bacterium and yeast tested, and lime oil was comparable to a 78 percent alcohol hand sanitizer on the test plate. (17)

That is why lemon and orange show up in so many of our cleaning recipes, from countertop sprays to deodorizing around the house.

D-Limonene and Cancer Research

D-limonene, the main compound in most citrus oils, has been studied for antioxidant, anti-inflammatory, anticancer and immune-modulating activity, mostly in cell and animal research. (18) In a 2025 study on human colon cancer cells in a petri dish, d-limonene slowed their growth and triggered apoptosis, the cells’ programmed death. (19)

The human work is small but interesting. In a 2013 University of Arizona study, 43 women awaiting breast cancer surgery took 2 grams of limonene daily for two to six weeks; it concentrated in their breast tissue and lowered the tumor marker cyclin D1 by 22 percent. (20) A 2021 scoping review found d-limonene well tolerated in the human trials so far and called for placebo-controlled trials. (21) None of this tested citrus oil as a cancer treatment, so we keep these oils as part of a healthy lifestyle and let your oncologist know what you are using.

How to Use Citrus Essential Oils Safely

Citrus oils are friendly, but they are still concentrated. Use them with wisdom.

• For diffusion: Use 3 to 5 total drops in a diffuser, depending on room size, and diffuse intermittently in a well-ventilated room. Try 2 drops orange, 2 drops lemon and 1 drop frankincense, a favorite in immune-boosting blends, or 3 drops lemon, 2 drops rosemary and 1 drop peppermint for focus. You will find dozens more in our essential oil diffuser recipes.
• For topical use: Dilute in a carrier oil, and keep the cold-pressed bergamot, grapefruit, lemon, lime and bitter orange within the limits above or off sun-exposed skin for 12 hours.
• For children: Use smaller amounts, diffuse gently, and choose sweet orange, mandarin or tangerine for anything that goes on skin that will see the sun.
• For ingestion: Only use citrus oils labeled for dietary use, and read our guide to taking essential oils internally first.
• For cleaning: Lemon and orange are ideal in sprays and scrubs; our homemade glass cleaner is a good place to start.

Add one drop of your favorite citrus essential oil to a tsp of honey, maple syrup, and/or coconut oil then mix with morning water or afternoon tea for a refreshing pick-me-up. Essential oils do not mix into plain water, so a drop added straight to your glass stays undiluted; always disperse it first. For a fun way to enjoy citrus oil, try our homemade citrus soda.

Citrus Essential Oil FAQs

Which citrus essential oil is best?

Sweet orange is the best all-around citrus oil for most families because it is inexpensive, calming and not phototoxic. Choose bergamot for stress and sleep, lemon for nausea and cleaning, and grapefruit for cravings and PMS.

Are citrus essential oils phototoxic?

Some are: cold-pressed bergamot, grapefruit, lemon, lime and bitter orange. Sweet orange, mandarin, tangerine, yuzu, bergamot FCF and distilled lemon and lime are not. After a phototoxic oil, keep that skin out of direct sun for 12 hours or stay under the dilution limits in the chart above.

Which citrus essential oil has the most limonene?

Sweet orange is usually the richest: orange oils are about 95 percent d-limonene, and bitter orange runs about 68 to 91 percent. (22) Lemon and mandarin come lower, at roughly 38 to 70 percent and 52 to 69 percent in the samples a 2021 review compiled. (22)

Can I put citrus essential oils in water?

Not straight in. Oil and water do not mix, so mix one drop of a dietary-grade citrus oil into honey, maple syrup or coconut oil before stirring it into water or tea.

Which citrus essential oil is best for cleaning?

Lemon and orange are the best citrus oils for cleaning because they are affordable, fresh smelling and rich in limonene. Lime and grapefruit work well in blends, and lab studies show all four fight common bacteria. (16, 17)

Keep reading: 12 Healing Oils of the Bible: Uses & Anointing Oil Recipe · Neroli Essential Oil Benefits: 8 Research-Backed Uses · Best Essential Oils for Anxiety & Panic Attacks + 3 DIY Remedies