HealthWatchlist verdict: Small trials of turmeric extracts and curcumin formulations offer some encouraging psoriasis findings, alongside an early low-response study. They do not establish that distilled turmeric essential oil treats psoriasis. The preparation, comparison group and use alongside standard treatment are central to the conclusion.
Turmeric is not one interchangeable treatment
A spice, an extract capsule, a formulated skin product and a distilled oil may all carry the word turmeric. Their chemistry and delivery differ. A study of one cannot automatically support another.
A review specifically examining turmeric oil explains that it does not contain curcuminoids. Curcumin belongs to that separate group of compounds. Distilled oil therefore cannot borrow the clinical reputation of curcumin merely because both originate from turmeric.
This is the first question to ask of a claim that turmeric oil is “clinically proven”: did the cited trial actually test the oil?
What the topical studies found
A 34-person trial investigated a turmeric microemulgel for plaque psoriasis. It used a blinded, within-person comparison and reported improvements in treated lesions and quality-of-life measures.
A formulated gel can control how an ingredient reaches skin. Its vehicle also matters. This result is preliminary support for that preparation, not evidence for applying essential oil or kitchen turmeric to plaques.
A separate scalp-psoriasis trial randomised 40 people to turmeric tonic or placebo. Over nine weeks, the tonic improved measured redness, scaling and thickening, as well as quality of life, compared with placebo.
These are relevant human findings and should not be dismissed as laboratory evidence. However, small, short studies leave questions about reproducibility, longer-term control, tolerability and how the formulations compare with established treatment.
Oral curcumin findings are mixed
A trial of 63 people tested a curcumin formulation alongside topical steroids. It reported greater improvement in psoriasis severity than the comparison treatment. The useful inference concerns an adjunct, not replacement of the steroid or efficacy of an aromatic oil.
An earlier open-label phase II study reported a low response rate. Only two participants responded, and the authors cautioned that the result could reflect placebo effects or the condition’s natural course.
The studies used different preparations and designs. They are not a straightforward head-to-head contradiction, but including both gives a more honest picture than citing only the favourable trial.
Neither provides a reason to swallow turmeric essential oil. A research capsule’s composition and absorption cannot be recreated by choosing an amount from a dropper bottle.
What a pooled review can and cannot settle
A 2022 review brought together seven clinical randomised trials and 19 preclinical studies. The authors found encouraging signals for curcumin, while considering several mechanisms and formulations.
The total of 26 studies must not be described as 26 human trials. Combining different routes and add-on treatments also does not identify a single retail product that reliably controls psoriasis.
For the essential-oil claim, the missing bridge remains direct clinical evidence for the oil itself. More mechanistic studies of curcumin cannot fill that gap.
| Preparation studied | Reasonable interpretation |
|---|---|
| Turmeric microemulgel or scalp tonic | Small positive trials of defined topical formulations. |
| Oral curcumin alongside steroids | Possible adjunctive benefit for that regimen. |
| Oral curcumin in an uncontrolled pilot | Low response; causal benefit uncertain. |
| Distilled turmeric essential oil | Not validated by those extract and curcumin trials. |
Safety should follow the actual product
The Drug-Induced Liver Injury Network reported ten turmeric-associated liver-injury cases, including serious outcomes. A case series cannot estimate the risk among all supplement users, but it contradicts the idea that concentrated botanical supplements are automatically harmless.
NCCIH highlights uncertainty about benefit and liver-injury concerns with some highly absorbable formulations. Its guidance also notes that topical turmeric can cause itching or hives. Culinary use, supplements and skin products need separate safety assessments.
Discuss supplements with a pharmacist or prescriber, especially if you take other medicines. Stop a new skin product if it irritates. Do not change prescribed psoriasis treatment in order to test an online recipe.
Keep a treatment plan that addresses psoriasis
NHS psoriasis guidance describes moisturisers, topical medicines and, when needed, specialist treatments. The choice depends on severity, location and the individual. Persistent joint pain, stiffness or swelling also deserves assessment.
Seek emergency help if psoriasis rapidly becomes red with joining pus-filled bumps, particularly with fever, shivering or a racing heart. Severe new symptoms need medical assessment rather than another topical experiment.
Evidence score and conclusion
John’s Evidence Score: 1/10 for distilled turmeric oil treating psoriasis. This reflects a lack of direct supporting treatment evidence in the research reviewed, not a judgement that every turmeric-derived preparation is inactive.
Curcumin and formulated extracts remain research candidates. For readers choosing a treatment today, the distinction prevents promising preliminary findings from becoming an unsupported essential-oil recommendation.
How this review was researched
Research checked on 13 September 2026. We searched PubMed for the named oils or preparations and the condition, followed relevant review references, checked relevant trial-register results where available, and checked the official guidance linked below. This is an editorial review, not an exhaustive systematic review. We distinguish human treatment outcomes from laboratory findings, and identify where a study tested a mixture or a different preparation.
Related reading
References
- Pharmacological Profile, Bioactivities, and Safety of Turmeric Oil.
- Topical Turmeric Microemulgel in the Management of Plaque Psoriasis; A Clinical Evaluation.
- Turmeric tonic as a treatment in scalp psoriasis: A randomized placebo-control clinical trial.
- Oral Curcumin (Meriva) Is Effective as an Adjuvant Treatment and Is Able to Reduce IL-22 Serum Levels in Patients with Psoriasis Vulgaris.
- Oral curcumin in the treatment of moderate to severe psoriasis vulgaris: A prospective clinical trial.
- Efficacy and safety of curcumin in psoriasis: preclinical and clinical evidence and possible mechanisms.
- Liver Injury Associated with Turmeric-A Growing Problem: Ten Cases from the Drug-Induced Liver Injury Network [DILIN].
- NCCIH: Turmeric
- NHS: Psoriasis
Related evidence review: Coconut Oil for Psoriasis: Moisturising Evidence and the Phototherapy Trial.