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Nigella sativa

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Nigella sativa is a unique annual flowering plant. It belongs to the Ranunculaceae family. People know it by many different names. Some call it black cumin or black caraway. Others call it black seed or kalonji. The name Nigella comes from a Latin word for black. This describes the dark color of its seeds. The specific name sativa means it is a cultivated plant. This plant is important because it is used as a spice. It is a staple in many Arab and Halal cuisines.

The plant has a very specific physical structure. It grows to a tall height. The leaves are finely divided and linear. The flowers are quite delicate in appearance. They are usually colored pale blue or white. Most flowers have between five and ten petals.

After flowering, the plant produces a specific type of fruit. This fruit is a large and inflated capsule. This capsule is composed of three to seven united follicles. Each follicle contains numerous small seeds. These seeds are the primary part used for cooking. People often use them as a spice. Sometimes they replace other plants like Bunium bulbocastanum.

Humans have a very long history with this plant. Archaeological evidence shows it was cultivated three millennia ago. Seeds have been found in several ancient Egyptian sites. They were even found inside the Tomb of Tutankhamun. In Turkey, seeds were found in a Hittite flask. These dates go back to the second millennium BC. The plant may have been a common condiment in the Old World.

Historical figures also studied the plant's uses. The Persian physician Avicenna wrote about it. He included it in his famous book, The Canon of Medicine. He described it as a treatment for dyspnea. This is a medical term for difficulty breathing. In the Middle East, it was used as traditional medicine. Today, the FDA in the United States classifies it as Generally Recognized as Safe. This means it is safe for use as a seasoning.

The seeds have a very complex chemical makeup. Oils make up 32% to 40% of the total seed composition. These oils contain linoleic acid and oleic acid. They also contain palmitic acid and trans-anethole. The seeds contain minor constituents like nigellicine and nigellidine. There are also aromatics like thymoquinone and carvacrol. Other aromatics include p-cymene, thymol, and various pinene compounds. The seeds also contain proteins and alkaloids.

Culinary uses for the seeds are widespread. In Palestine, they are ground into a bitter qizha paste. Dry-roasted seeds can flavor curries, vegetables, and pulses. They are used to season poultry and salads. In some cultures, they flavor different bread products. In Bengali cuisine, they are part of a five-spice mix called panch phoron. You can see them on naan, such as nân-e barbari. They are even used in majdouleh, which is a braided string cheese.

Scientists continue to study the plant's health effects. Many people use it in folk medicine across Africa and Asia. However, there is not enough high-quality clinical evidence yet. This means we do not fully know if it treats human diseases. One meta-analysis found weak evidence for certain benefits. It suggested a short-term benefit for lowering blood pressure. A 2016 review looked at cholesterol levels. It indicated that supplementation may lower total cholesterol and triglycerides.

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