Kalonji (Nigella sativa)

Kalonji (Nigella sativa) is a medicinal seed containing thymoquinone as its primary bioactive compound. It demonstrates antioxidant activity through DPPH radical scavenging and shows preliminary anti-cancer effects via sapindoside B.

Origin & History

Kalonji (Nigella sativa L.), also known as black cumin, originates from Southwest Asia and is cultivated globally in Mediterranean, Middle Eastern, and Indian regions. The bioactive compounds are extracted from seeds via solvent extraction, supercritical CO2, or steam distillation to produce seed oil (NSO) or powdered extracts.

Historical & Cultural Context

Nigella sativa has been used for over 2000 years in traditional systems including Unani, Ayurveda, and Islamic medicine (Tibb-e-Nabwi) for digestive issues, inflammation, and respiratory conditions. Historical texts reference it as a general health remedy, establishing its longstanding role in traditional phytotherapy.

Health Benefits

• Antioxidant properties: In vitro studies show NSO exhibits DPPH radical scavenging (IC50 3.8 mg/mL) and reduces oxidative stress markers in animal models
• Potential anti-cancer activity: In vitro tests demonstrate sapindoside B inhibits cancer cell lines at IC50 <10-20 µM (preliminary evidence only)
• Immune modulation: Animal studies suggest effects on splenocyte proliferation and macrophage function (no human trials available)
• Anti-inflammatory potential: Contains flavonoids like quercetin and kaempferol with demonstrated anti-inflammatory pathways in vitro
• Traditional digestive support: Used historically for digestive issues though no clinical trials validate this use

How It Works

Thymoquinone, the primary active compound in kalonji, exhibits antioxidant activity by scavenging DPPH radicals with an IC50 of 3.8 mg/mL. The compound sapindoside B demonstrates cytotoxic effects against cancer cell lines at concentrations below 10-20 µM. These compounds work by reducing oxidative stress markers and potentially interfering with cancer cell proliferation pathways.

Scientific Research

The research dossier reveals no human clinical trials, RCTs, or meta-analyses for Nigella sativa were found. Available evidence consists solely of in vitro antioxidant assays, animal studies in Wistar rats, and cell culture experiments examining anti-cancer properties.

Clinical Summary

Current evidence for kalonji is primarily based on in vitro studies and animal models rather than human clinical trials. Laboratory studies show kalonji seed oil exhibits moderate antioxidant activity with DPPH radical scavenging capabilities. Preliminary in vitro cancer research indicates sapindoside B may inhibit certain cancer cell lines at micromolar concentrations, though human studies are lacking. The evidence remains in early stages and requires clinical validation.

Nutritional Profile

Per 100g of Nigella sativa seeds: Protein 20-27g (rich in essential amino acids including glutamic acid ~4.4g, arginine ~2.5g, aspartic acid ~2.4g); Fat 28-38g (predominantly polyunsaturated: linoleic acid/omega-6 ~55-60% of fatty acid profile, oleic acid/omega-9 ~20-24%, palmitic acid ~12-14%, with alpha-linolenic acid/omega-3 ~0.5-1.5%); Carbohydrates 23-35g (dietary fiber ~5-7g, including mucilaginous polysaccharides); Moisture ~5-7g; Ash ~4-5g. Key micronutrients: Iron 10-16mg/100g, Calcium 160-190mg/100g, Zinc 4-6mg/100g, Potassium 450-500mg/100g, Phosphorus 490-530mg/100g, Magnesium 185-210mg/100g, Copper 1.1-1.8mg/100g, Thiamine (B1) ~0.6mg/100g, Niacin (B3) ~3.8mg/100g, Folate ~610µg/100g. Primary bioactive compounds: Thymoquinone (TQ) 0.4-2.5% of volatile oil and primary active constituent of cold-pressed oil (NSO); Thymohydroquinone, thymol, carvacrol (phenolic monoterpenes, collectively 30-48% of essential oil); p-cymene ~7-15% of essential oil; Alpha-thujene ~3-7%; Nigellicine and nigellidine (indazole alkaloids, trace quantities ~0.2-0.4%); Nigellimine-N-oxide (pyrazole alkaloid); Carvone ~4%; Fixed oil (NSO) contains beta-sitosterol ~44-54% of sterol fraction and campesterol ~5-10%. Tocopherols present in fixed oil: alpha-tocopherol ~340mg/kg oil, gamma-tocopherol ~220mg/kg oil. Saponins including alpha-hederin (~0.01-0.1% dry weight). Bioavailability notes: Thymoquinone has poor aqueous solubility (~0.6 mg/mL) limiting oral bioavailability; lipid-based formulations or black seed oil (cold-pressed) significantly enhance TQ absorption compared to raw ground seeds; grinding seeds immediately before consumption improves release of volatile compounds versus pre-ground; bioavailability of iron is moderate, partially limited by co-existing phytates (~1.5-3% phytic acid content); heating reduces TQ content by 20-40% depending on temperature and duration.

Preparation & Dosage

No clinically studied dosage ranges for humans are available. In vitro studies used NSO at 5 mg/mL and isolated compounds at 25-250 µM, but these cannot be extrapolated to human doses. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Turmeric, Ginger, Green Tea Extract, Vitamin C, Quercetin

Safety & Interactions

Kalonji is generally considered safe when used as a culinary spice, but concentrated supplements may cause gastrointestinal upset in some individuals. It may potentially interact with diabetes medications by enhancing blood sugar-lowering effects. Pregnant and breastfeeding women should avoid therapeutic doses due to insufficient safety data. Individuals with bleeding disorders should use caution as kalonji may affect blood clotting.