Essential Oils for Focus, Memory and Energy: What the Research Shows
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 clear benefit.
Content last updated . This page has not been medically reviewed.
Safety first. Natural products can cause side effects and interact with medicines. Read essential oil safety before you use anything on this page.
Short answer. A few small experiments found that the smell of some oils changed test scores or alertness for a short time in healthy adults. Reviews call the overall picture limited or mixed, and we found no good evidence that essential oils improve everyday memory or energy. They are not a replacement for sleep, a medical check, or care for memory loss. Essential oils should never be swallowed; Poison Control warns that misuse can cause serious poisoning. [1]
Which oils are studied, and which plants they come from
Most memory and focus studies use rosemary (Rosmarinus officinalis; the accepted name in the GBIF plant database is now Salvia rosmarinus), peppermint (Mentha x piperita) and lavender (Lavandula angustifolia). [2][3][4] The abstracts we read do not say which plant part was distilled, so a label that gives the botanical name, part and country is the best clue to what a product is. See how to read an essential oil label. The plants themselves are covered in rosemary as a herb and peppermint as a herb.What research shows
Almost all of this research tests smell (inhaled aroma). It tells us nothing about what happens if an oil is put on skin or swallowed.| Question | What the source found | Strength of evidence | Who and what was studied |
|---|---|---|---|
| Does rosemary aroma help memory? | Rosemary improved overall quality of memory but slowed speed of memory compared with no aroma. [3] | Promising but limited | 144 healthy adults, one session in a test cubicle |
| Does lavender aroma help memory? | Lavender reduced working-memory performance and slowed reaction times in the same trial. [3] A review of 11 studies found lower arousal and better sustained attention, with controversial results for memory. [5] | Mixed | Healthy adults; short exposures |
| Does peppermint aroma help memory or alertness? | In one trial peppermint improved memory and raised self-rated alertness, while ylang-ylang impaired memory but increased calmness. [4] A scoping review of eight studies said a definitive conclusion is premature. [6] | Promising but limited | 144 healthy volunteers in the trial; reviews of mixed designs |
| Do rosemary, lavender or orange oil help memory problems in people with a health condition? | Memory problems fell over time in the lavender and rosemary groups, but there was no significant difference between the four groups. [7] | Insufficient evidence | 86 people on hemodialysis in Iran; oil on gauze near the nose for 30 minutes, three times a week for a month |
| Can diffuser air itself affect thinking? | In a simulated office, exposure to lemon-oil emissions shortened reaction time but worsened response control and memory sensitivity. Unscented grapeseed-oil emissions had similar effects. [8] | Preliminary (59 students, lab setting) | Ultrasonic diffuser, not the scent alone |
Energy and tiredness
Proper evidence not found for essential oils raising everyday energy in healthy adults. We searched PubMed for systematic reviews of aromatherapy and fatigue and for trials of aroma and alertness. The fatigue reviews we found were in specific patient groups. A Cochrane review of people on dialysis judged, in low certainty evidence, that aromatherapy may improve fatigue. [9] A meta-analysis in people with cancer found aromatherapy did not significantly reduce fatigue. [10] Neither result applies to ordinary tiredness. Ongoing tiredness has many causes worth checking, see fatigue: when to get help.Why the evidence is hard to trust
- A smell is hard to hide, so people often know which group they are in. One rosemary and lavender study kept its true aim secret to limit this. [3]
- Scores and moods are often self-rated and measured once, soon after the smell.
- A review of lavender studies noted that oil quality was not assessed and the methods differed, so a placebo effect could not be separated from the oil. [5]
- The same plant can give oils of different composition, so a result for one product may not carry over to another.
If memory or focus is the worry
Trouble with memory or attention can come from sleep loss, stress, medicines, mood or health conditions, and deserves a conversation with a clinician. See focus and memory and forgetfulness and memory loss: normal or not?.Frequently asked questions
Does rosemary oil improve memory?
In one trial of 144 healthy adults, rosemary aroma improved overall quality of memory but slowed speed of memory. [3] A trial in people on dialysis found no significant difference between groups. [7] The evidence is limited, not settled.
Does peppermint oil help you stay alert?
One trial found peppermint aroma raised self-rated alertness and improved memory scores. [4] A scoping review of eight studies said it is too early for a definitive conclusion. [6]
Is lavender relaxing or does it hurt concentration?
Both were reported. A trial found slower reaction times with lavender aroma [3], while a review found lower arousal and higher sustained attention, with unclear results for memory. [5]
Can essential oils replace caffeine or fix tiredness?
We found no good evidence that they can. Fatigue reviews were in people on dialysis or with cancer, and results differed. [9][10] Long-lasting tiredness should be checked by a clinician.
Is it safe to diffuse oils while studying or working?
Diffusers add chemicals and particles to room air, and one simulated-office study linked emissions to worse response control. [8] Ask a clinician if you have asthma or other breathing problems, and keep oils away from children and pets. [1]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety
- NCCIH describes aromatherapy as most often inhaling oils or applying a diluted form to the skin. [11] Many oils can cause rashes on the skin, and some can be poisonous if absorbed through the skin or swallowed. [1]
- Lavender aromatherapy is described as possibly safe but may cause headache or coughing. [12]
- Menthol in peppermint oil should not be inhaled by or applied to the face of an infant or small child, because it may affect breathing. [13]
- Diffusers release chemicals into room air; see essential oil diffusers and, for breathing problems, oils, diffusers and breathing problems.
- Essential oils may interact with medications. [1] Ask a pharmacist or clinician, and see how interactions work.
- If someone swallows an oil, call Poison Help at 1-800-222-1222. Call 911 for collapse, a seizure or trouble breathing. [1]
References
- Poison Control (National Capital Poison Center), Essential oils: Poisonous when misused Read 2026-10-22.
- GBIF Backbone Taxonomy, Rosmarinus officinalis match Read 2026-10-22.
- Moss M et al., Aromas of rosemary and lavender essential oils differentially affect cognition and mood in healthy adults, Int J Neurosci 2003 Read 2026-10-22.
- Moss M et al., Modulation of cognitive performance and mood by aromas of peppermint and ylang-ylang, Int J Neurosci 2008 Read 2026-10-22.
- Lavender aromatherapy: a systematic review from essential oil quality and administration methods to cognitive enhancing effects, Appl Psychol Health Well Being 2022 Read 2026-10-22.
- Heterogeneity in the study of peppermint in aromatherapy on cognition and attention: a critical scoping review, Complement Med Res 2025 Read 2026-10-22.
- The effects of lavender, rosemary and orange essential oils on memory problems and medication adherence among patients undergoing hemodialysis, Explore (NY) 2022 Read 2026-10-22.
- The impact of emissions from an essential oil diffuser on cognitive performance, Indoor Air 2022 Read 2026-10-22.
- Interventions for fatigue in people with kidney failure requiring dialysis, Cochrane Database Syst Rev 2023 Read 2026-10-22.
- Effects of aromatherapy on cancer patients' sleep and fatigue: a systematic review and meta-analysis, J Integr Complement Med 2023 Read 2026-10-22.
- National Center for Complementary and Integrative Health (NCCIH), Aromatherapy Read 2026-10-22.
- NCCIH, Lavender Read 2026-10-22.
- NCCIH, Peppermint Oil Read 2026-10-22.