Clary Sage Oil and Mood: What Researchers Have Tested
The idea that clary sage oil lifts mood goes back to a rat swimming in a tank. That experiment is genuinely interesting, and it also sits several steps away from a person's depression, which is why the whole subject deserves a slow look.
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Shop Now →The rat study everyone cites
A 2010 study screened chamomile, clary sage, rosemary and lavender oils in the forced swim test, a laboratory screen for antidepressant-like behaviour, giving them to rats by injection or inhalation. A 5% clary sage oil showed the strongest anti-stressor effect, and drugs that block dopamine receptors blocked it, so the authors proposed a dopamine pathway (Seol et al., J Ethnopharmacol, 2010).
"Antidepressant-like" in a rat means a behaviour changed on a screen; it does not mean the animal was depressed or that a person's mood would follow. And injecting an oil is a long way from smelling one. Single rodent results are starting hypotheses, nothing more.
The human studies, small and varied
- Menopausal women, 2014. Twenty-two women inhaled clary sage oil while researchers tracked cortisol and serotonin in blood; both moved, with differences between groups sorted by depression questionnaires, and the abstract describes no comparison group (Lee et al., 2014). Our article on the cortisol claim goes into it in detail.
- Diabetic foot ulcer patients, 2025. Seventy-two people inhaled 5% clary sage, 5% linalyl acetate or almond oil. Clary sage reduced self-rated stress in the mild-depression group; in the moderate-to-severe group, with 9 to 11 per arm, the reported improvements were for linalyl acetate (Son et al., 2025).
- Older adults in care, 2026. A pilot of 37 residents inhaled a bergamot and clary sage blend for 15 minutes nightly for four weeks against unscented almond oil, with better scores on a depression scale and a sleep questionnaire. The authors called it preliminary and larger trials are needed (Wang et al., Clin Gerontol, 2026). It was a blend, so the result belongs to the pair rather than to clary sage.
A systematic review of aromatherapy for depressive symptoms found 12 randomized trials, 7 of them reporting improvement, with half rated lower quality (Sánchez-Vidaña et al., 2017). Scent studies carry an extra twist: a review of odor research found that psychological explanations fit the data better than pharmacological ones (Herz, 2009), meaning that liking a smell can itself brighten a mood measure for a while.
A habit for reading the next headline
Name the species first, since a rat result is a hypothesis. Name what was measured next, because a blood marker moving is not the same as someone feeling or functioning differently. And name the preparation, because oil, linalyl acetate alone and a two-oil blend each behaved differently above, so a claim about "clary sage" should say which one it means.
Our place in this
We sell a cosmetic clary sage oil, Salvia sclarea, valued for a sweet, dry, softly herbal aroma. We make no claim about depression, and the research summarized here would not support one. The National Institute of Mental Health describes depression as a medical condition for a primary care doctor, psychologist or psychiatrist to evaluate, and notes the FDA has not approved any natural product for it (NIMH, depression). If low mood has lasted two weeks or more, or is getting in the way of daily life, please start there. In the United States you can also call or text 988 at any hour for the Suicide and Crisis Lifeline, and call 911 if life is in danger.
If you simply love the aroma, treat it as a nice part of your day. We advise avoiding it during pregnancy, keeping it away from children and pets, and never taking it by mouth; diluted skin use follows our 0.5% to 2% guidance with a patch test first. Our pieces on anxiety research and sleep research cover the neighbouring questions.
A good-smelling bottle is a pleasure worth having, and it is best kept in that lane.
Clary Sage Essential Oil
Clary Sage Essential Oil from our own shop, in sizes from 0.5 oz to bulk.
From $19.99
Shop Now →Sources & Further Reading
- National Institute of Mental Health, Depression
- Seol GH et al., 2010. Antidepressant-like effect of Salvia sclarea in rats
- Lee et al., 2014, Phytotherapy Research
- Son et al., 2025, Frontiers in Medicine
- Wang et al., 2026, Clinical Gerontologist
- Sánchez-Vidaña DI et al., 2017. Effectiveness of aromatherapy for depressive symptoms
- Herz RS, 2009. Aromatherapy facts and fictions