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L'huile essentielle de romarin contre le psoriasis ?

Rosemary Essential Oil, useful against psoriasis?

Psoriasis is a skin disease characterized by the appearance of red patches covered with scales. Affecting nearly 2% of the French population, psoriasis can have negative repercussions on the lives of patients. Up until now, there is no treatment that can completely cure psoriasis. However, various solutions can be adopted to control its progression and symptoms. Is rosemary essential oil one of them? The answer is in this article.

Published February 9, 2024, by Manon, Head of Scientific Communication — 5 min read

Psoriasis, in brief.

Psoriasis is a chronic inflammatory disease that primarily affects the skin and joints . It presents as red, thick patches that shed scales. Psoriasis is characterized by an excessive renewal and accumulation of epidermal cells, leading to a local inflammation . Indeed, immune cells (T lymphocytes) are found in the skin and produce inflammatory molecules (cytokines Il-17, Il-22, TNF-α , IL-1β ...) that stimulate the proliferation of keratinocytes. The renewal period of these cells, normally three weeks, is then reduced to three days. This results in an accumulation of immature keratinocytes on the skin surface, increasing the thickness of the outer layer (the cornea). This is referred to as hyperkeratosis .

Psoriasis is primarily caused by genetic factors. Indeed, about 30% of cases are linked to familial forms that involve genetic predispositions. The main gene involved in this condition is the PSORS1 locus. Other minor genes also play a role. Other factors external can contribute to the development of psoriasis, such as certain medications, streptococcal infections, stress, as well as lifestyle (alcohol consumption, smoking...).

The skin symptoms of psoriasis can affect any area of the body, from the ears to the tongue, including the genital areas which can lead to various clinical forms. However, the scaly plaques are generally located on the scalp, elbows, and knees. They are sometimes accompanied by a rheumatism.

What are the benefits of rosemary essential oil on psoriasis?

Theessential oil of rosemary is extracted from the aromatic plant Rosmarinus officinalis, more commonly known as rosemary. This essential oil is obtained by steam distillation of rosemary leaves. It has been widely used since ancient times for its medicinal and aromatic properties, particularly to relieve rheumatic pains, stimulate blood circulation, and soothe digestive disorders. Today, rosemary essential oil is used in aromatherapy for its numerous skin benefits, such as its anti-inflammatory, antibacterial, and antioxidant properties.

The eucalyptol and borneol found in rosemary essential oil can limit the proliferation of keratinocytes, which is excessive in individuals suffering from psoriasis. This is due to their ability to inhibit the synthesis of certain pro-inflammatory cytokines, such as TNF-α, IL-1β, and IL-6. Beyond their roles in the immune response, these cytokines also act as growth factors for keratinocytes, the cells that make up the outer layer of the skin. By inhibiting these cytokines, the process of skin keratinization can be reduced. Additionally, studies have shown that camphene, found in rosemary essential oil, possesses anti-inflammatory properties by inhibiting prostaglandin E2, which is linked to the inhibition of cyclooxygenase (COX). Prostaglandins are inflammatory molecules that increase sensitivity to pain.

The essential oil of rosemary possesses antioxidant properties that may be beneficial for combating oxidative stress, associated with more severe symptoms of psoriasis. Indeed, 1,8-cineole, α-pinene, and β-pinene are three components of this essential oil that have a free radical scavenging activity. Their role is to neutralize free radicals, which are unstable molecules with a free electron, by donating a free electron to them.

Thus, rosemary essential oil can help alleviate certain symptoms of psoriasis such as itching or irritation and slow down the keratinization process. However, it should be noted that no study has proven its beneficial effect on psoriasis.


JUHÀS S. & al. Anti-Inflammatory Effects of Rosmarinus officinalis Essential Oil in Mice. ACTA VETERINARIA BRNO (2009).

RAŠKOVIĆ A. & al. Antioxidant activity of rosemary (Rosmarinus officinalis L.) essential oil and its hepatoprotective potential. BMC Complementary and Alternative Medicine (2014).

BHOWAL M. & al. Eucalyptol: Safety and Pharmacological Profile. Journal of Pharmaceutical Sciences (2015).

HAMIDPOUR S. & al. Rosmarinus Officinalis (Rosemary): A Novel Therapeutic Agent for Antioxidant, Antimicrobial, Anticancer, Antidiabetic, Antidepressant, Neuroprotective, AntiInflammatory, and Anti-Obesity Treatment. Biomedical Journal of Scientific & Technical Research (2017).

MOLINER C. & al. Rosemary Flowers as Edible Plant Foods: Phenolic Composition and Antioxidant Properties in Caenorhabditis elegans. Antioxidants (2020).


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