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Tout savoir sur l'huile de nigelle.

Everything you need to know about black seed vegetable oil.

Beyond its culinary qualities that make it a favorite ingredient among chefs, black seed oil is also a vegetable oil used in the cosmetic and therapeutic fields. Benefits for the skin and hair, biochemical composition, usage precautions... Discover everything you need to know about black seed oil.

What is black seed?

The nigella, also known as black cumin, is an aromatic plant with lovely blue flowers that primarily grows in Egypt. In addition to its aesthetic properties, it produces a large quantity of aromatic black seeds each year, which are often found in Oriental dishes. The cultivation of nigella dates back to antiquity. The ancient Egyptians regarded it as a cure-all and called it "the blessed seed". It was also used by the Greeks and Romans for its therapeutic properties. From the seeds of nigella, it is possible to extract an oil that is used in the composition of numerous treatments for the skin and hair under its INCI name Nigella Sativa Seed Oil.

What is the biochemical composition of black seed oil?

Theblack seed oil is a natural ingredient rich in intriguing molecules, responsible for the various benefits it provides to the skin and hair. The table below summarizes the different active principles found in black seed oil, as well as the main properties associated with them.

Active IngredientPercentageProperty(ies)
Linoleic Acid≈ 56%Nourishing, hydrating
Oleic Acid≈ 24%Moisturizer
Palmitic Acid≈ 20%Moisturizer
Stearic Acid≈ 5%Moisturizer
Eicosadienoic Acid≈ 2%Moisturizer
ThymoquinoneLess than 1%Antioxidant, anti-inflammatory
Nigelline, NigelloneLess than 1%Assists in digestion, anti-allergic
Vitamins (A and E)Less than 1%Nutritional Value

What is the method of extracting black seed oil?

There are several methods to extractblack seed oil from its seeds, but the technique to favor in order to keep all its active principles intact and all its benefits is the cold pressingmethod. Specifically, a screw press is used to push the seeds into a barrel-shaped cavity. The screw then compresses them and the oil comes out through the openings, while the pressing residues (cake) remain in the barrel. The oil thus collected is finally filtered to remove impurities and stored away from light, moisture, and air.

Note : 1 kg of black cumin seeds yields approximately 200 to 250 mL of black seed oil.

What are the benefits of black seed oil?

When applied topically to the skin or hair, black seed oil provides numerous benefits.

  • Moisturizing.

    Naturally present in the hydrolipidic film of the skin, the saturated fatty acids from black seed oil form a protective veil on the epidermis. This film acts like a shield on the skin and notably helps to protect it from UV rays, pollution, and dehydration. The hydrolipidic film is also found around hair fibers, where it plays a similar protective role.

  • Nourishing.

    The linoleic acid found in black seed oil contributes to the restoration and maintenance of the protective corneal layer of the epidermis. Indeed, when linoleic acid comes into contact with the ceramides of this layer, an esterification reaction occurs, during which the linoleic acid and lipids bind, forming the skin's waterproof barrier.

    Black seed oil can also be used as a hair treatment to nourish and strengthen hair fibers. The palmitic acid it contains, which has a structure similar to the lipids that make up the cuticle of the hair, can integrate into it and act as an intercellular cement. Thus, black seed oil protects fine and fragile hair and makes it shinier.

  • Antioxidant.

    Black seed oil derives its antioxidant properties from thymoquinone. This molecule has a protective effect on cellular organelles and DNA, defending the skin and hair fibers against the action of free radicals. Indeed, these reactive and unstable species can notably cause genetic mutations and are involved in the premature aging of the skin and the appearance of white hair. Thus, black seed oil has a photoprotective potential and is an excellent ally to prevent the appearance of wrinkles.

  • Anti-inflammatory.

    Studies have shown that thymoquinone is also capable of reducing the production of interleukins-1β, 2, and 6 (IL-1β, IL-2, and IL-6), which are pro-inflammatory cytokines. Thymoquinone also inhibits the expression of cyclooxygenase (COX), an enzyme that catalyzes the transformation of arachidonic acid into prostaglandin H2, thereby increasing inflammation. This makes black seed oil a good ingredient for combating redness and itching. It can also be used as a supplement by people suffering from acne, eczema, psoriasis , or rosacea.

  • Healing.

    Theblack seed oil can, to some extent, combat acne marks and stretch marks. Its healing properties were notably highlighted in a recent study conducted on injured rats. Scientists demonstrated that, following the application of a gel containing 10% black seed oil and the placement of a bandage for 7 days, the sizes of the rats' wounds were reduced by 40%. The mechanism explaining the healing effects of black seed oil has not yet been identified, but these effects have been substantiated by several studies.

What are the contraindications and precautions for the external use of black seed oil?

Black seed oil can be applied to the skin, scalp, or hair. It is suitable for all skin types and can be used by pregnant women for external application. However, it is not suitable for mucous membranes or the eye contour. Therefore, if you use black seed oil on your face, it is important to avoid any contact with the eyes. Additionally, it is important to dilute black seed oil in another vegetable oil before applying it. A dilution of 5 to 10%, depending on your skin's sensitivity, is generally recommended.

Finally, it's important to note that black seed oil can be allergenic for some individuals. Therefore, before incorporating it into your skincare routine, we advise you to perform a tolerance test, to ensure that your skin does not react to this ingredient. To do this, apply a small amount of black seed oil to the inside of your elbow or behind your ear and wait 24 hours. If you do not observe any redness, irritation, or itching, you can use it.

Sources

  • SUTRISNA E. & al. A Comparative Study of the Effects of Nigella sativa Oil Gel and Aloe Vera Gel on Wound Healing in Diabetic Rats. Journal of evidence-based integrative medicine (2018).

  • AL-FARGA A. & al. A Narrative Review on Various Oil Extraction Methods, Encapsulation Processes, Fatty Acid Profiles, Oxidative Stability, and Medicinal Properties of Black Seed ( Nigella sativa). Foods (2022).

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