Clary Sage Oil Benefits: An Evidence Map With Our Own Grading
Almost every claim about clary sage oil's benefits traces back to about a dozen small studies, and several of them tested blends in which clary sage was one of three oils. We went through them one at a time and graded each claim area with a rubric of our own, which we explain below. The short version: the best-supported finding is a small trial of inhaled oil and blood pressure, and for hair and skin we found no human trial at all.
Clary Sage Essential Oil
Our own Clary Sage Essential Oil, in sizes from 0.5 oz to bulk.
From $19.99
Shop Now →Our grading rubric (ours, not a standard)
We invented this scale to keep ourselves honest, so treat it as a reading aid and not an accepted method.
- Grade 1: a randomised, controlled human trial of clary sage oil on its own. Even then, the sample sizes here are small.
- Grade 2: a human trial where clary sage was one component of a blend, or a human study with no control group.
- Grade 3: lab or animal work only (cells, bacteria in dishes, rodents).
- Grade 4: we found nothing.
Grade 1 does not mean "proven"; it means the study design could, in principle, isolate the oil.
The evidence map
| Claim area | Study and preparation | Design, n | What was reported | Grade and limits |
|---|---|---|---|---|
| Autonomic measures | Seol 2013: clary sage 5% vol/vol, inhaled 60 min | Double-blind RCT, 34 women with urinary incontinence, undergoing urodynamic testing | Lower systolic blood pressure than control (p=0.048) and than lavender (p=0.026); lower respiratory rate than control | Grade 1. Clinical setting, about 11 per arm, no sleep or mood outcome |
| Cortisol and serotonin | Lee 2014: clary sage oil, inhaled | 22 menopausal women in their 50s, split by depression screening | Cortisol fell and 5-HT rose after inhalation | Grade 2. The abstract does not describe a placebo group, so a before-after change cannot be credited to the oil |
| Pulse and mood | Mitic 2020: oil on the forearm (30 people) or inhaled 30 min (32 people) | Pilot, healthy volunteers | Pulse effects depended on sex and route; women and men moved in different directions | Grade 1 for design, but a pilot with about 15 per sex per experiment |
| Menstrual cramps | Han 2006: 2 drops lavender, 1 clary sage, 1 rose in 5 cc almond oil, abdominal massage | 67 students, 3 groups (25, 20, 22) | Lower cramp scores than the almond-oil placebo and no-intervention groups on days 1 and 2 | Grade 2. Blend of three oils |
| Menstrual cramps | Ou 2012: lavender, clary sage, marjoram 2:1:1 at 3% in cream | Double-blind RCT, 48 women, vs synthetic fragrance | Pain scores fell in both groups; pain duration fell from 2.4 to 1.8 days in the oil group | Grade 2. Blend, and the comparison fragrance group improved too |
| Sleep quality | Kao 2017: lavender, clary sage, marjoram 1:1:1 | RCT, 132 working women, 4 weeks, 4 arms | Blend group had larger sleep-score gains than lavender alone | Grade 2. Questionnaire outcome, blend |
| Uterine contraction | Wong 2020: sclareol and a clary sage oil extract | Rat uterine tissue, rats, mice | Sclareol inhibited induced contractions and writhing | Grade 3. Sclareol is a minor component (0.3% in the oil analysed by Mitic 2020), not the oil |
| Bacteria in a dish | Sienkiewicz 2015: oil in broth | In vitro, Staphylococcus strains from wound infections | MICs of 3.75 to 7.00 µl/ml | Grade 3. A dish result; it does not show effect on skin |
| Hair, skin appearance | None found | Grade 4 |
Reading the table, claim by claim
Stress. This is the most-cited area. The Lee 2014 paper (Lee et al., Phytotherapy Research, 2014) reports striking percentages for 5-HT, but the design is small and a pre-post change in plasma levels in 22 people is not a placebo-controlled finding. The Seol trial has a proper control but measured blood pressure during a stressful exam. Our cortisol study article and stress, mood and sleep article go through those two in detail.
Menstrual pain and menopause. Both cramp trials used blends. Han used four drops of three oils in 5 cc; at an assumed 20 drops per ml (an approximation, the Tisserand Institute notes drop counts vary), that is about 0.2 ml in 5 ml, roughly 4%, and Ou used 3%. Han's figure is above the 0.5% to 2% on our own pages and above the 1 to 3% the Tisserand Institute gives for body oils, and Ou's 3% is at the top of that range (Tisserand Institute, Dilution). That is a reason not to copy them. For the lab side, the uterine work used sclareol, not whole oil. Persistent or severe period pain deserves a gynaecologist, and see our women's health hub.
Skin and antimicrobial. Sienkiewicz tested oil in broth against bacteria from wounds. A 2023 composition study (Kačániová et al., Int J Mol Sci, 2023) found low antioxidant activity (the oil neutralised 11.76% of DPPH radical) and "moderate" antimicrobial results. The leap from a petri dish to "good for skin" is unsupported, and the same oil is classified as a skin and eye irritant and dermal sensitiser in the EFSA feed-additive opinion, based on supplier safety data sheets (EFSA FEEDAP Panel, 2024). Our side effects article has the practical consequences.
Hair. We searched PubMed for Salvia sclarea and hair on 23 October 2026. The only hits were lab studies of Trichosporon fungi. There is no human hair trial for us to report, so hair "benefits" are, today, an untested claim.
What popular lists say that the studies do not
- "Balances hormones": the human studies above measured cortisol, serotonin, thyroid-stimulating hormone (Lee 2014: reduced in all groups but not significantly) and pain scores, not estrogen or progesterone. We did not verify a hormone claim for the oil.
- Any claim that the oil fixes or eases a condition: the cramp trials were of blends, and one of them had improvement in the fragrance control group as well.
- "Antidepressant": one small study of serotonin and cortisol whose abstract describes no placebo group; we fetched no trial with depression as the outcome.
Who should not lean on any of this
Anyone pregnant (our own page says to avoid clary sage during pregnancy: ask an OB-GYN or midwife), anyone with a medical condition behind the symptom (see a physician), and anyone who needs to drive soon (our page warns that it is unusually relaxing to sit with). Our oils are sold undiluted: the 0.5% to 2% in a carrier oil range on our pages, and a patch test, are your job. We sell no health product and no carrier oils.
Our broader overviews, the complete guide, household uses and the myths post, cover scent and craft use, which is what we sell the oil for.
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
- Seol et al., 2013. Randomized controlled trial for Salvia sclarea or Lavandula angustifolia. pubmed.ncbi.nlm.nih.gov/23360656
- Lee et al., 2014. Changes in 5-hydroxytryptamine and cortisol plasma levels in menopausal women after inhalation of clary sage oil. pubmed.ncbi.nlm.nih.gov/24802524
- Mitic et al., 2020. Clary Sage Essential Oil and Its Effect on Human Mood and Pulse Rate. pubmed.ncbi.nlm.nih.gov/32688401
- Han et al., 2006. Effect of aromatherapy on symptoms of dysmenorrhea in college students. pubmed.ncbi.nlm.nih.gov/16884344
- Ou et al., 2012. Aromatic essential oil massage in outpatients with primary dysmenorrhea (J Obstet Gynaecol Res). pubmed.ncbi.nlm.nih.gov/22435409
- Kao et al., 2017. Comparisons for Effectiveness of Aromatherapy and Acupressure Massage on Quality of Life in Career Women. pubmed.ncbi.nlm.nih.gov/28504569
- Wong et al., 2020. Salvia sclarea essential oil extract and sclareol, uterine hypercontraction model. pubmed.ncbi.nlm.nih.gov/33066489
- Sienkiewicz et al., 2015. The effect of clary sage oil on staphylococci responsible for wound infections. pubmed.ncbi.nlm.nih.gov/25821423
- Kačániová et al., 2023. Salvia sclarea Essential Oil Chemical Composition and Biological Activities. pubmed.ncbi.nlm.nih.gov/36982252
- EFSA FEEDAP Panel, 2024. Safety and efficacy of a feed additive consisting of an essential oil derived from the flowering stems of Salvia sclarea L. pmc.ncbi.nlm.nih.gov/PMC11561422
- Tisserand Institute. Dilution. tisserandinstitute.org/safety/dilution