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Open Source Apothecary At Home / Preparations
The oral capsule has anxiolytic trials. It is not the thing in a dropper bottle, and it is not the thing in a diffuser.
remedyLavender is the most-used essential oil and the one with the most clinical evidence, and the evidence is attached to a specific preparation rather than to the oil in general.
The oral capsule. A standardised oral lavender oil preparation has randomised trials showing anxiolytic effect, with the notable finding that it reduced anxiety without sedation or dependence. This is a licensed pharmaceutical-grade preparation, and the finding does not transfer to a dropper of essential oil, to a bath product, or to a diffuser.
Inhaled lavender is a pleasant adjunct with weaker evidence. There is some trial evidence for anxiety in specific settings (dental and preoperative), and the effect is small and partly the ritual.
Sleep. Small trials of lavender inhalation show improved sleep quality in some settings. Modest, and much weaker than the behavioural programme for insomnia.
Topical lavender in an infused oil is soothing and pleasant and has no meaningful clinical evidence beyond that.
The two cautions that matter.
Never swallow essential oil. The oral lavender evidence is for a specific licensed preparation at 80 mg daily. Swallowing an aromatherapy-grade oil is a different substance, at an uncontrolled dose, and several oils are hepatotoxic or neurotoxic by mouth.
Sensitisation. Linalool and linalyl acetate — lavender's main constituents — oxidise on storage into allergens. An old, half-used bottle is more allergenic than a fresh one, and repeated neat application produces a permanent allergic contact dermatitis. Store lavender dark and cool, replace aged oil, and dilute to 2-3% for skin.
Where lavender is not the answer. Insomnia is treated with a behavioural programme that outperforms every supplement. Anxiety is treated with CBT and exercise. Lavender is a gentle adjunct to those, not a substitute, and a diffuser is not a therapy.
This study indicates that aromatherapy improves sleep quality in older adults, with single-use lavender, non-inhalation aromatherapy, lasting less than 4 weeks being particularly effective.PubMed 39654196 ↗
Inhalation aromatherapy is effective in improving sleep problems such as insomnia.PubMed 33655928 ↗
Aromatherapy is an effective intervention for reducing preoperative anxiety in adults.PubMed 32861206 ↗
The present systematic review was not funded and was registered in PROSPERO under the following number: CRD42019130126.PubMed 31655395 ↗
Inhalation of lavender essential oil via a mask clip may serve as an effective complementary approach for improving emotional and physiological outcomes in hypertensive adults.PubMed 41177368 ↗
Quick reference
| | | |---|---| | Life | Woody perennial sub-shrub | | Hardiness | Marginal in zone 6a — wet kills more than cold | | Propagation | Cuttings — named varieties do not come true from seed | | Light | Full sun | | Soil | Sharply drained, lean, gritty. Wet roots are fatal. | | Spacing | 45-60 cm | | Harvest | Flower spikes as the flowers open, before full open for peak oil | | Dry | Shade, ambient — a volatile-oil plant | | Winter | Wet cold is the killer. Gravel mulch, raised bed, sheltered spot. |
Lavandula angustifolia is the hardier and more aromatic species; L. stoechas (French lavender) is showier and more tender. Plant on a mound or ridge with the crown above the water line, mulch with gravel rather than woodchip, and do not enrich the soil — lean, stressed lavender smells stronger. Take softwood cuttings each early summer so you have replacements when a bad winter takes the parent.
See growing-mediterranean-herbs for the full method, and growing-from-seed-and-cuttings for the cutting technique.
Diluted topical use
Inhaled
Infused oil from dried flowers
Bath
The oral preparation
Storage — this is safety, not housekeeping
What has more evidence for what lavender is used for