Essential Oils & Aromatherapy

An A to Z directory of every essential oil with a guide on this site: botanical name, plant part, the key caution found in the sources we read, and a link to its guide.

What essential oils are, how sources define them, what research and regulators say, and the safety points to know first. The starting page for the whole Essential Oils l…

How essential oils are made on an industrial scale, as published sources describe: steam distillation, cold pressing of citrus peel and solvent extraction, and what each…

How essential oils differ from fragrance oils and "fragrance" on a label, what US regulators and reviews say, and what a label can and cannot tell you about safety.

Absolutes, hydrosols and infused oils sound like essential oils but are made differently and carry their own cautions. Here is how published sources describe each one.

Essential oils are mixtures of many compounds, mostly terpenes. Plain-language chemistry on linalool, limonene, menthol and eucalyptol, and why air exposure creates alle…

What the evidence and regulators say about marketing claims that essential oils cure disease, detox the body, boost immunity or act as antivirals.

In the US an essential oil is regulated by how it is marketed, as a cosmetic, a drug or a consumer product. This page also summarizes EU cosmetics rules and what we coul…

Lavender oil (Lavandula angustifolia): what research and official bodies say about anxiety, sleep, skin reactions and hormone questions, plus safety for children, pregna…

Peppermint oil (Mentha x piperita): what research says about IBS, headache and nausea, why menthol matters for babies and young children, and other safety points.

Tea tree oil (Melaleuca alternifolia): what NCCIH and trials say about acne and other skin uses, why it is poisonous if swallowed, skin allergy, and the risks to cats an…

Rosemary oil (Salvia rosmarinus): what small trials say about hair loss, memory and mood, how it differs from rosemary leaf, and safety points for skin, children, pregna…

Eucalyptus oil (mainly Eucalyptus globulus): why swallowing is dangerous, what the EMA and case reports say about children, and what evidence exists for colds and muscle…

What frankincense oil is, what the research does and does not show, which safety points matter, and why the trees it comes from are a conservation concern.

What lemongrass oil is, how it differs from citronella oil, what small studies and repellent reviews found, and why skin sensitization is the main safety point.

What patchouli oil is, why it is mostly a fragrance material, the few small human studies that exist, and the skin and breathing cautions that sources describe.

What helichrysum (immortelle) oil is, what laboratory and animal studies show, why skin and scar claims lack human trials of the oil, and the allergy points to know.

Lemon essential oil, sun sensitivity, skin and poison-center cautions, and what small scent trials found for mood and nausea, in plain language.

Sweet orange and bitter orange essential oils compared plainly: names, sun sensitivity, skin and poison-center cautions, and what small aromatherapy trials found.

Bergamot essential oil and its sun-sensitizing compound bergapten: documented skin reactions, what small trials found for stress and PMS symptoms, and plain safety limit…

Grapefruit essential oil: the grapefruit-and-medicine question explained, sun and skin cautions, and what small scent trials found for PMS symptoms and procedure discomf…

Lime essential oil and sunlight: why pressed and distilled lime oils differ, what safety assessments say about skin, and where trial evidence is missing.

Mandarin and tangerine essential oils: how the names overlap, what a trial in infants found, sun and skin cautions that sources do not settle, and where evidence is miss…

Roman and German chamomile oil are two different plants. What small aromatherapy trials found, why daisy-family allergy matters, and why the oil is never swallowed.

Geranium oil comes from Pelargonium graveolens. Small trials of inhaled geranium report less anxiety and fatigue; skin allergy is documented, and the oil is never swallo…

Ylang ylang oil comes from Cananga odorata flowers. It had the most positive skin patch tests among oils in one clinic network, and small inhaled trials show mixed effec…

Clary sage oil comes from Salvia sclarea. Small trials looked at blood pressure, mood markers and labor, but claims that it balances hormones or starts labor are not sho…

Neroli oil comes from Citrus x aurantium blossom. Small inhaled trials looked at anxiety, labor and menopause symptoms; skin allergy is documented and the oil is never s…

Jasmine and rose oils come from flowers and are used in perfume and aromatherapy. What small trials found, which allergy and safety points sources raise, and what is unk…

Basil and sweet marjoram oils are used in aromatherapy and massage. What small trials found, why basil chemistry and estragole matter, and what sources do not say about …

Spearmint oil is a carvone-rich mint oil, different from menthol-rich peppermint. What the few small trials found, and the safety points sources do and do not cover.

Vetiver oil is a deep, earthy oil from the roots of a grass. What the small human trials found, one fragrance-safety opinion on a related product, and what sources do no…

Cedarwood oil comes from several unrelated trees (Juniperus, Cedrus and others). What the human research is, what animal studies show, and the irritation and sensitizati…

Sandalwood oil (mainly Santalum album): what small studies found, why fake and mixed oils are common, skin allergy findings, and conservation concerns. Skin and scent us…

Myrrh oil (Commiphora myrrha resin): the difference between the essential oil and the EMA-assessed resin tincture, what two massage trials found, and safety notes.

Pine oil from Pinus species: how it differs from household pine-oil cleaners, why swallowing is dangerous, what little human research exists, and skin sensitizer warning…

Cypress oil (Cupressus sempervirens): mostly laboratory research, no good human trials found, and why hinoki cypress studies are about a different tree. Safety gaps stat…

Juniper berry oil (Juniperus communis): what the EMA assessed, why kidney disease and pregnancy are listed as cautions, and why no clinical trials of the oil exist. Not …

Camphor oil and camphor products can cause seizures in young children after swallowing or heavy skin use. What poison experts and case reports say, and what to do first.

Cinnamon oil (Cinnamomum species): what the sources say about skin irritation and allergy, the limited human research, bark versus leaf, and why it is never for swallowi…

Clove oil (Syzygium aromaticum) and its main chemical eugenol: toothache claims, documented liver injury in toddlers who swallowed it, skin allergy, and why it is not fo…

Oregano oil (Origanum vulgare): what the claims are, what human research exists, how oil of oregano supplements differ from the essential oil, and safety points.

Thyme oil (Thymus vulgaris): what thymol and carvacrol are, the one inhalation trial we could read, what is not known about its safety, and why it is not for swallowing.

Wintergreen oil is almost pure methyl salicylate. Learn why tiny swallowed amounts have poisoned children, how it can raise bleeding risk with warfarin, and what to do f…

Pennyroyal oil has caused liver failure and deaths when swallowed. What the poison and liver sources say, why pennyroyal is not a safe remedy, and who to call.

What sources document about skin irritation and allergy from cinnamon, clove, oregano and thyme oils, what we could not find on burns, and what to do after a reaction.

What aromatherapy is, how it is delivered, what systematic reviews and NIH summaries say about sleep, anxiety, nausea and pain, how it is regulated, and the main caution…

How scent is delivered in inhalation aromatherapy, what trials and reviews found for nausea, anxiety, sleep and pain, why results are hard to compare, and the cautions.

What essential oil diffusers are, what air-quality studies measured for ultrasonic and heat diffusers, and the cautions for lungs, children and pets. No product rankings.

What aromatherapy massage is, what a Cochrane review and later meta-analyses found for people with cancer, and the skin, allergy and other cautions to know about.

What systematic reviews found for aromatherapy after surgery, during cancer treatment, for procedure anxiety and in palliative care, and why it is supportive care, not a…

What guidelines and trials say about aromatherapy in labor: results on pain and anxiety are mixed, NICE advises against offering it in early labor, and safety needs a mi…

What an aromatherapist title does and does not mean: US and UK sources on licensing, certification and training, how credentials are defined, and questions to ask before…

Candles, room sprays, rollers and reed diffusers sold as aromatherapy: what the label does and does not mean, who regulates them, and what studies found about emissions …

How aromatic plant oils came to be called aromatherapy: what sources say about early use, distillation, the word coined in France in the 1930s, and why the dates differ.

What clinical trials and reviews found about lavender oil for sleep and anxiety, with inhaled and massage studies kept apart from trials of a specific oral lavender oil …

What the sources say about skin irritation and allergy from lavender and tea tree oils, and the unresolved question of breast tissue growth in children, with what a regu…

Popular claims about lavender oil for hair growth, skin, pain, insects and baths checked against what trials, lab studies and regulators actually found.

What trials and reviews found about peppermint oil rubbed on the forehead for tension headache and inhaled for nausea, with menthol cautions for young children.

What pooled trials found about enteric-coated peppermint oil capsules for irritable bowel syndrome, why a capsule made for medical use is not the same as bottled oil, an…

What health agencies and poison experts say about peppermint oil, the menthol in it, and young children, pets, skin reactions and allergy, with the gaps in the evidence …

Does peppermint oil repel spiders, mice or other pests? A plain check of the one spider experiment, what extension services say about rodents, and the safety questions a…

What clinical trials and reviews found for tea tree oil (Melaleuca alternifolia) on acne, toenail fungus and dandruff, with trial sizes, strength of evidence and safety …

Why tea tree oil is a poisoning risk when swallowed by people and when put on or eaten by cats and dogs, based on NCCIH, poison-center pages and veterinary case reviews.

Why tea tree oil can cause skin rashes and allergy, how air and light change the oil, and what patch-test studies and case reports show, with plain next steps.

What research shows for essential oils and common goals such as sleep, anxiety, headache, nausea, skin and hair, with an evidence label and a link to every goal page.

What reviews and trials found about lavender and other essential oils for sleep, how strong that evidence is, what the cautions are, and when poor sleep needs a clinicia…

What systematic reviews and NIH say about essential oils for anxiety, stress and low mood: lavender is studied most, the evidence is mixed and limited, and crisis help c…

What small trials and reviews found about peppermint and lavender oil for tension headache and migraine, where the evidence conflicts, and which headaches need urgent ca…

What reviews and trials found about inhaled peppermint, ginger and other essential oils for nausea after surgery, during chemotherapy and in pregnancy, with limits and c…

What trials and reviews found for essential oils and pain: period cramps, muscle and joint aches, and after surgery, with the limits of the studies and the safety points.

What research says about eucalyptus, menthol and other essential oils for colds, cough, congestion and sinus symptoms, the immune-boost claim, and why babies and swallow…

What research found for tea tree and other essential oils on acne and eczema, why oils are a common cause of skin allergy, and why eczema-prone skin needs extra care.

Rosemary oil versus minoxidil, a mixed-oil trial in patchy hair loss, and tea tree shampoo for dandruff: what each trial found, how small the evidence is, and scalp safe…

What research and CDC, EPA and NHS sources say about essential oils against mosquitoes, ticks and head lice, why registered repellents matter for disease protection, and…

What small studies found when people smelled rosemary, peppermint or lavender oil while testing memory, attention and tiredness, and why the results do not add up to a c…

What Cochrane and other reviews found about lavender and other scents for agitation and memory in people with dementia, and why the care team should be asked first.

What systematic reviews found about aromatherapy for menopause symptoms and period pain, what is known about clary sage and hormones, and when symptoms need a clinician.

Strong scents can bother sensitive airways. What the sources say about essential oils, diffusers, asthma and allergic rhinitis, and why an asthma plan comes first.

Claim check on essential oils marketed for weight loss, blood pressure and digestion, with what trials and reviews found and why they do not replace medical care.

How health agencies and aromatherapy bodies describe breathing in and skin use of essential oils, what they warn against, and why swallowing is not part of the picture.

Why dilution matters, what a professional body and one aromatherapy educator publish, and why ratio, drop and percentage charts disagree. No universal chart is offered h…

What a carrier oil is, why sources say essential oils are diluted in one, what the sources we read say about jojoba and coconut oil, and where no evidence was found.

What sources say about skin reactions to essential oils, when a patch test is suggested, why reactions can appear days later, and when to get urgent help.

What sources say about essential oils added to baths, room sprays and rollerball products, including irritation of mucous membranes, flammability and children, without a…

Why this site gives no advice to swallow essential oils, what poison-center and hospital reports describe, and where to get help if someone has swallowed one.

Why homemade essential oil blends and recipes raise documented risks, with what poison centers, skin-allergy studies and the FDA say. This page contains no recipes.

What sources say about essential oil oxidation, old oils and skin allergy, why no shelf-life figure is given here, and keeping oils away from children with child-resista…

What is known about essential oils and medicines, from wintergreen and warfarin reports to peppermint and lavender studies, and where proper evidence was not found.

How to read essential oil quality claims: botanical names, "pure", "natural" and "therapeutic grade", what testing studies found, and what quality cannot tell you.

What published laboratory studies found when they tested commercial essential oils for adulteration, and what those findings can and cannot tell a buyer.

"Therapeutic grade" and "certified pure" on essential oil labels: what the claim says, what the sources we read say about regulation, and what a reader can safely do.

How to read an essential oil label: scientific name, plant part, country of origin, batch information and storage words, and what each does and does not tell you.

What GC-MS testing is, what a batch report can show about an essential oil, and what it cannot show about safety, benefit or adulteration.

What "organic", "wildcrafted" and country-of-origin claims on essential oils do and do not tell you, using FDA, USDA and published testing studies.

How to check health claims about essential oils made by sellers, including direct-sales and network-marketing sellers, using FDA and FTC guidance. No companies named.

Why some essential oils cost far more than others, what a published review says about yield and rarity, and why a high or low price does not prove purity or benefit.

What published sources say about conservation of the trees behind sandalwood, frankincense and rosewood oils, and about the communities who harvest them.

A checklist for comparing essential oil products using label facts, testing studies and regulator statements. No brands, no rankings and no winner.

Essential oil safety in plain language: poisoning, skin reactions, sunlight, children, pregnancy, pets and who to call. No dilution chart and no advice to swallow any oi…

What to do first if a child or adult swallows an essential oil or gets one in the eyes or lungs, in plain steps, with US Poison Help and 911, and what poison centers say.

How essential oils can irritate skin or cause allergy, why a reaction can become lifelong, what dermatology studies found for tea tree, lavender and oxidized oils, and w…

Why some citrus and other oils can cause burns, blisters or dark patches when skin meets sunlight, which chemicals are involved, and what the FDA, a case series and lab …

What veterinary poison sources report about essential oils and pets: which animals are at most risk, signs of poisoning, what is known about tea tree oil and flea produc…

What poison centers, NIH and case reports say about essential oils near babies and children: swallowing, menthol, camphor, skin, hormone questions, and where to get help.

What NIH, a placental cell study and an aromatherapy association say about essential oils in pregnancy and breastfeeding, what is not known, and why to ask a midwife or …

What asthma organizations, agencies and the few studies we could read say about essential oils, diffusers and scented products for people with asthma or other breathing …

Reports of seizures linked to camphor, eucalyptus, sage and other oils, what a published review lists, and why laboratory anticonvulsant findings do not mean oils are sa…

Which liver and medicine concerns with essential oils are documented in case reports, which are only laboratory findings, and where the sources we read say nothing.

What health sources say about essential oils in the eyes, nose and other delicate tissues, with reported injuries, first-aid guidance for chemicals in the eye, and what …

What chamber studies, the EPA and an aromatherapy association say about essential oil diffusers and indoor air, and what is documented about skin reactions in people who…

Which warning signs after essential oil contact, swallowing, inhaling or an eye splash call for 911, Poison Help or a clinician, as poison centers and health services de…

What sources say about essential oils and aromatherapy for older adults: sleep and mood research, medicine and falls questions, smell changes, and who to ask first.

What research and cancer agencies say about aromatherapy as supportive care during cancer treatment, what it cannot do, and why the oncology team should know first.

Shared-air questions about essential oils at work, in spas and in schools: scent sensitivity, asthma and allergy, diffuser air and what the sources say about policies.

Why essential oils can irritate or sensitize eczema-prone and sensitive skin, how allergy to oils and fragrance is described, and what to ask a pharmacist or clinician.

What sources say about essential oils in sports rubs and muscle products, including menthol and wintergreen, skin burns with heat, medicine interactions and what trials …

How much human research exists on essential oils and aromatherapy, what a publication count does and does not show, what NIH and systematic reviews conclude, and how to …

How smell signals reach the brain, what trials suggest about aroma and mood, why expectation and placebo effects are hard to separate, and why blinding a scent trial is …

What systematic reviews of human trials of aromatherapy and essential oils found, where reviews disagree, and why most trials are small, short and hard to blind.

A plain table of how much PubMed research exists for lavender, peppermint, tea tree, eucalyptus, rosemary and frankincense, beside what the reviews we read actually conc…

Why an essential oil that kills germs in a dish is not proof it helps a person, with real examples of cell, animal and human studies and how to tell them apart.

How the long use of aromatic plants in named traditions differs from what clinical trials show, with lavender, tea tree and frankincense as worked examples.

Why many essential oil and aromatherapy studies are hard to trust: small trials, scent that cannot be hidden, expectation effects, uneven reporting and who pays for rese…

What science has not yet settled about essential oils, from long-term safety and hormone questions to indoor air, contamination and whether scent benefits are more than …

Lavender and chamomile oil side by side: how the plants differ, what small inhalation trials found, and the daisy-family allergy point. No winner is declared.

Peppermint and eucalyptus oil compared: what each is, what regulators and trials found, and why both need extra care around babies, young children and swallowing.

Roman and German chamomile oil come from different plants with different chemistry. What sources document, what they do not, and why daisy-family allergy applies to both.

Sweet and bitter orange oil compared: names and labels, what small inhalation trials found, the sunlight (phototoxicity) question, and the bitter orange supplement warni…

How essential oils and carrier oils differ, why sources describe diluting one in the other, how trials use a carrier oil as the comparison, and where no evidence was fou…

What the sources we read say about ultrasonic, nebulizing and heat diffusers as device types, including the one study that compared ultrasonic and heat, and where no evi…

How the sources we read place essential oils next to medical care: used alongside it, what trials compared, what regulators say, and why no oil is a replacement for trea…

A side-by-side look at what the sources we read say about aromatherapy, massage and herbal teas for relaxation, with each one's evidence label, safety points and gaps.

Plain definitions of essential oil and aromatherapy terms, from absolute and hydrosol to chemotype, phototoxicity and GC-MS, with sources and notes on terms with no offi…

A side-by-side table of 37 essential oil pages with the plant's checked scientific name, the evidence label from each oil's page, and the main safety point sources descr…

Plain answers to the questions people ask most about essential oils: are they safe, do they work, pregnancy, children, pets, medicines and labels, with the sources behin…

A one-page quick reference for essential oil warning signs and whom to call: Poison Help 1-800-222-1222, 911, 988 and a vet, with the oils that have caused the most seri…