# Nigella Seed (Nigella sativa)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/nigella-seed
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-04
**Evidence Score:** 2 / 10
**Category:** Seed
**Also Known As:** Nigella sativa, Black seed, Black cumin seed, Kalonji, Habba Sawda, Haba al-barakah, Blessed seed, Roman coriander, Fennel flower seed, Nutmeg flower, Love-in-a-mist seed, Devil-in-the-bush, Schwarzkümmel

## Overview

Nigella sativa seeds contain thymoquinone as the primary bioactive compound, which inhibits NF-κB signaling and modulates [oxidative stress](/ingredients/condition/antioxidant) pathways to produce [anti-inflammatory](/ingredients/condition/inflammation) and metabolic effects. Clinical research supports its use for [blood glucose](/ingredients/condition/weight-management) regulation in type 2 diabetes and [thyroid](/ingredients/condition/hormonal) auto[immunity](/ingredients/condition/immune-support), particularly at doses of 2–3g daily.

## Health Benefits

• Reduces [blood glucose](/ingredients/condition/weight-management) and HbA1c in type 2 diabetes - RCTs with 94 patients showed significant improvements at 2-3g/day for 12 weeks (moderate evidence)
• Lowers [inflammation](/ingredients/condition/inflammation) markers in autoimmune conditions - double-blind RCT in 40 Hashimoto's [thyroid](/ingredients/condition/hormonal)itis patients reduced TSH, T3, and anti-TPO antibodies (moderate evidence)
• Improves metabolic syndrome parameters - RCT showed reduced FBG, postprandial glucose, HbA1c, and LDL-C with 500mg/day for 8 weeks (moderate evidence)
• Reduces chemotherapy side effects - clinical trial in pediatric leukemia patients showed fewer adverse effects at 40mg/kg/day for 3 months (preliminary evidence)
• Lowers [blood pressure](/ingredients/condition/heart-health) and [oxidative stress](/ingredients/condition/antioxidant) - meta-analyses confirm cardiovascular benefits though larger RCTs needed (moderate evidence)

## Mechanism of Action

Thymoquinone, the principal bioactive in nigella seed oil, suppresses NF-κB and MAPK signaling cascades, reducing downstream production of [pro-inflammatory cytokine](/ingredients/condition/inflammation)s including TNF-α and IL-6. It also activates Nrf2-mediated [antioxidant](/ingredients/condition/antioxidant) response elements, upregulating superoxide dismutase and catalase activity. Additionally, thymoquinone enhances insulin receptor sensitivity and inhibits α-glucosidase activity, contributing to its observed hypoglycemic effects.

## Clinical Summary

A pooled analysis of RCTs involving 94 type 2 diabetes patients demonstrated that 2–3g/day of nigella seed powder for 12 weeks produced significant reductions in fasting [blood glucose](/ingredients/condition/weight-management) and HbA1c compared to placebo, representing moderate-quality evidence. A double-blind RCT in 40 Hashimoto's [thyroid](/ingredients/condition/hormonal)itis patients showed meaningful reductions in TSH, free T3, and anti-TPO antibody titers following nigella seed supplementation. Evidence quality is moderate overall, limited by small sample sizes and short durations; larger phase III trials are lacking. Effects on lipid profiles and [blood pressure](/ingredients/condition/heart-health) have also been reported in secondary endpoints across several studies, though these findings are less consistent.

## Nutritional Profile

{"macronutrients": {"protein": "20g per 100g", "fat": "35g per 100g", "carbohydrates": "45g per 100g", "fiber": "10g per 100g"}, "micronutrients": {"vitamins": {"vitamin C": "1mg per 100g", "vitamin A": "2 IU per 100g"}, "minerals": {"calcium": "931mg per 100g", "iron": "66mg per 100g", "magnesium": "385mg per 100g", "zinc": "4mg per 100g"}}, "bioactive_compounds": {"thymoquinone": "2-5% of oil content", "nigellone": "trace amounts"}, "bioavailability_notes": "The bioavailability of thymoquinone may be enhanced when consumed with fats due to its lipophilic nature. Minerals such as iron and calcium may have reduced absorption due to the presence of phytates."}

## Dosage & Preparation

Clinically studied doses: 2-3g/day seeds for 12 weeks (diabetes); 500mg/day for 8 weeks (metabolic syndrome); 2g/day for 8 weeks (Hashimoto's [thyroid](/ingredients/condition/hormonal)itis); 0.5-2g powder/day for 4 weeks (healthy volunteers); 40mg/kg/day for 3 months (pediatric leukemia). Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Nigella sativa is generally well tolerated at doses up to 3g/day, with the most commonly reported side effects being mild gastrointestinal discomfort, nausea, and bloating. Thymoquinone inhibits CYP2D6 and CYP3A4 enzymes in vitro, raising potential interaction concerns with drugs metabolized by these pathways, including certain antidepressants, statins, and immunosuppressants. Due to its [blood glucose](/ingredients/condition/weight-management)-lowering effects, concurrent use with antidiabetic medications such as metformin or insulin may increase hypoglycemia risk and warrants monitoring. Nigella sativa is not recommended during pregnancy at therapeutic doses, as animal studies suggest possible uterotonic effects; safety in breastfeeding has not been established.

## Scientific Research

A 2017 systematic review of RCTs identified benefits for metabolic syndrome, diabetes, hypertension, and inflammatory disorders. Multiple meta-analyses (PMIDs: 27512971, 30873688, 33183658) confirm Nigella sativa lowers glycemic status, [blood pressure](/ingredients/condition/heart-health), [inflammation](/ingredients/condition/inflammation), and [oxidative stress](/ingredients/condition/antioxidant). Clinical trials have tested doses from 0.5-3g/day for 4-12 weeks in conditions ranging from diabetes to Hashimoto's [thyroid](/ingredients/condition/hormonal)itis.

## Historical & Cultural Context

Nigella sativa has been used for centuries in Middle Eastern, Islamic (Unani/Tibb), Ayurvedic, and traditional Mediterranean medicine for respiratory issues, [digestion](/ingredients/condition/gut-health), [inflammation](/ingredients/condition/inflammation), and general vitality. Historical references date back over 2,000 years, traditionally used as an antidote and health tonic.

## Synergistic Combinations

Cinnamon, Berberine, Alpha-Lipoic Acid, Turmeric, Omega-3

## Frequently Asked Questions

### How much nigella sativa should I take per day for blood sugar?

Clinical trials demonstrating reductions in fasting glucose and HbA1c in type 2 diabetes patients used doses of 2–3g of nigella seed powder daily, typically divided into two doses taken with meals. Lower doses around 1g/day have shown less consistent glycemic effects in published research. Always consult a healthcare provider before combining with existing antidiabetic medications due to additive hypoglycemic risk.

### What is thymoquinone and why does it matter in black seed?

Thymoquinone is the primary bioactive constituent of Nigella sativa seed oil, comprising roughly 30–48% of the volatile oil fraction and responsible for most of the plant's documented anti-inflammatory, antioxidant, and metabolic effects. It works by inhibiting NF-κB transcription factor activation and stimulating Nrf2-driven antioxidant enzyme production. The concentration of thymoquinone varies significantly between products, which contributes to inconsistency across commercial supplements.

### Can nigella sativa help with Hashimoto's thyroiditis?

A double-blind RCT in 40 Hashimoto's thyroiditis patients found that nigella seed supplementation significantly reduced TSH, free T3, and anti-TPO antibody levels compared to placebo, suggesting a modulatory effect on thyroid autoimmunity. The proposed mechanism involves thymoquinone's suppression of Th1/Th17-driven inflammatory pathways that contribute to thyroid tissue damage. While these findings are promising, the study is small and replication in larger trials is needed before firm clinical recommendations can be made.

### Does nigella sativa interact with any medications?

Thymoquinone has demonstrated inhibition of CYP2D6 and CYP3A4 enzymes in vitro, which could theoretically raise plasma levels of drugs metabolized by these pathways, including certain SSRIs, tricyclic antidepressants, calcium channel blockers, and immunosuppressants like cyclosporine. Its blood-glucose-lowering action also poses an additive risk when combined with insulin or oral hypoglycemics. Patients on anticoagulants such as warfarin should exercise caution, as nigella seed may have mild antiplatelet properties.

### Is nigella sativa safe to take during pregnancy?

Nigella sativa at therapeutic supplement doses is not considered safe during pregnancy, as animal studies have identified possible uterotonic effects of thymoquinone that could stimulate uterine contractions. Culinary use in small food amounts is generally regarded as acceptable, but concentrated extracts and standardized supplements should be avoided. There is insufficient human data on safety during breastfeeding, so supplemental use in lactating women is also not currently recommended.

### What is the most effective form of nigella seed supplementation—oil, powder, or extract?

Black seed oil and standardized extracts containing 5-10% thymoquinone show superior bioavailability compared to whole seed powder, with better absorption of active compounds. Most clinical trials demonstrating efficacy for blood sugar and inflammation used either cold-pressed oil or concentrated extracts at 0.5-3g daily. Whole seed powder remains viable if consuming 5-10g daily, though this higher volume may be less convenient than liquid or capsule forms.

### Which health conditions have the strongest clinical evidence supporting nigella sativa use?

Type 2 diabetes shows the strongest evidence with multiple RCTs demonstrating significant reductions in fasting blood glucose and HbA1c at 2-3g daily over 12 weeks. Hashimoto's thyroiditis and metabolic syndrome parameters also have moderate-quality RCT support, with studies showing reduced TSH and improved lipid profiles. Respiratory and immune support claims have weaker evidence, primarily from small or in-vitro studies rather than large clinical trials.

### Can I get sufficient nigella sativa benefits from food sources, or do I need a supplement?

While nigella seeds are used as a culinary spice in Middle Eastern and Indian cuisines, typical food amounts (less than 1g per serving) are unlikely to reach the therapeutic doses of 2-3g daily shown effective in clinical studies. Supplementation with standardized extracts or oil is generally necessary to achieve the concentrations of thymoquinone and other active compounds demonstrated in research. However, incorporating nigella seeds into your diet provides additional nutritional value and may have modest complementary effects.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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