---
title: "Black Seed: Benefits, Uses & Side Effects | Herbadex"
description: "A spice seed for which small studies saw modest falls in blood sugar, cholesterol and blood pressure. Kitchen amounts are safe."
language: en
url: https://herbadex.com/en/herb/black-seed/
source: Herbadex (https://herbadex.com)
---

[Seed](https://herbadex.com/en/form/seed/)

# Black Seed

Nigella sativa

B Limited clinical evidence

A spice seed for which small studies saw modest falls in blood sugar, cholesterol and blood pressure. Kitchen amounts are safe.

[Respiratory, Throat & Mouth](https://herbadex.com/en/for/respiratory/) [Metabolism, Weight & Blood Sugar](https://herbadex.com/en/for/metabolism/) [Heart & Circulation](https://herbadex.com/en/for/heart-circulation/)

 

Image: Herbadex Botanik Stüdyosu · Özel Üretim

Pregnancy **Caution**

Breastfeeding **Caution**

Children **Caution**

Drug interactions **Interaction reported**

## At a glance

Black seed (Nigella sativa) is a black-seeded spice used on bread and cheese. Thymoquinone is thought to be mainly responsible for its effects. Meta-analyses of small trials show modest falls in fasting blood sugar in type 2 diabetes, cholesterol and blood pressure; study quality is limited. The saying "a cure for everything but death" is not a scientific claim.

**Parts used:** seeds

**Key constituents:** Thymoquinone, Linoleic Acid, Nigellone

Updated: October 15, 2026

ℹ Compiled from standard pharmacognosy references and clinical literature summaries where no formal EMA monograph exists.

## What is it used for?

-   B Limited clinical evidence
    
    Small studies suggest it may help modestly lower fasting blood sugar in type 2 diabetes. \[1\]
    
-   B Limited clinical evidence
    
    Small studies reported modest falls in total and LDL cholesterol and blood pressure. \[1\]
    
-   C Laboratory / animal evidence
    
    Lab studies showed anti-inflammatory and bronchodilating effects. \[1\]
    

## How is it used?

### Food

Sprinkle seeds on bread, cheese, salads and yoghurt, or grind and mix with honey. Studies used 1–3 g of ground seed daily.

**Amount:** 1–3 g daily

**Duration limit:** 8–12 weeks (in studies)

\[1\]

## Safety & interactions

-   Amounts used as a spice in food are generally safe; this does not apply to concentrated extracts and supplements.
-   People on diabetes or blood pressure medicines should monitor blood sugar and blood pressure.
-   Stop high-dose use 2 weeks before surgery (theoretical effect on clotting).
-   Avoid high doses (supplements) in pregnancy; amounts in food are fine.

\[1\] \[2\]

### Drug interactions

| Medicine / substance | Effect | Severity |
| --- | --- | --- |
| Diabetes medicines | May further lower blood sugar. [2] | Moderate |
| Blood pressure medicines | May further lower blood pressure. [2] | Minor |
| Anticoagulants | High doses could theoretically raise bleeding risk. [2] | Minor |

### Side effects

-   Indigestion, bloating
-   Rarely allergic rash

#### ⚕ When to see a doctor

-   If high fever, shortness of breath or purulent/bloody phlegm develops
-   If symptoms do not improve within 1–2 weeks or worsen
-   If severe abdominal pain, jaundice, rash or allergic reaction occurs

## Did you know?

Black seeds were found in the tomb of Tutankhamun. \[1\]

## Frequently asked questions

Is black seed a cure for everything?

No. That traditional saying is not a scientific claim; evidence points to limited benefit in a few areas.

Does black seed lower blood sugar?

Small studies saw a modest fall; it does not replace diabetes treatment.

How is black seed eaten?

Sprinkled on bread, cheese and salads, or ground and mixed with honey.

## Sources

1.  [WHO Monographs on Selected Medicinal Plants (Volumes 1–4)](https://www.who.int/publications/i/item/9241545178) World Health Organization · 2009
2.  [Herbs at a Glance: Evidence-Based Fact Sheets on Botanical Products](https://www.nccih.nih.gov/health/herbsataglance) NIH NCCIH · 2024

### Cite This Page

Black Seed (Nigella sativa). Herbadex — Doğal Şifa Rehberi (2026). https://herbadex.com/en/herb/black-seed/

## Related guides and comparisons

-   [Understanding Evidence Levels (A, B, C and T)](https://herbadex.com/en/guide/understanding-evidence-levels/)
-   [Black Seed or Black Seed Oil?](https://herbadex.com/en/compare/black-seed-vs-black-seed-oil/)

## Related plant and preparations

[Black Seed Oil](https://herbadex.com/en/herb/black-seed-oil/)

## On this page

At a glance What is it used for? How is it used? Safety & interactions Did you know? Frequently asked questions Sources Related herbs

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### [Black Seed Oil](https://herbadex.com/en/herb/black-seed-oil/)

B Limited clinical evidence

Nigella sativa

Oil pressed from black seed. Small studies saw modest falls in blood sugar and cholesterol and limited benefit in asthma.

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B Limited clinical evidence

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A Strong clinical evidence

Capsicum annuum

Made by drying and crushing red chillies. Its capsaicin is used in effective nerve-pain creams; its effect in food is small.

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### [Cumin](https://herbadex.com/en/herb/cumin/)

B Limited clinical evidence

Cuminum cyminum

An essential spice for meatballs and pulses. Small clinical studies saw mild benefit for bloating, IBS symptoms and weight control.

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### [Spirulina Powder](https://herbadex.com/en/herb/spirulina-powder/)

B Limited clinical evidence

Arthrospira platensis

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### [Sumac](https://herbadex.com/en/herb/sumac/)

B Limited clinical evidence

Rhus coriaria

A sour, red spice. Small clinical studies reported modest improvements in blood sugar and cholesterol in type 2 diabetes.

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## Other herbs in the same preparation form (Seed)

[Seed →](https://herbadex.com/en/form/seed/)

 

### [Chasteberry Seed](https://herbadex.com/en/herb/chasteberry-seed/)

A Strong clinical evidence

Vitex agnus-castus

Chasteberry dry extract may help with symptoms of premenstrual syndrome (PMS); regular use for 3 months is recommended for effect.

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### [Flaxseed](https://herbadex.com/en/herb/flaxseed/)

A Strong clinical evidence

Linum usitatissimum

Taken with plenty of liquid, flaxseed may help soften stools in habitual constipation; drinking enough fluid with it is essential.

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### [Sesame](https://herbadex.com/en/herb/sesame/)

B Limited clinical evidence

Sesamum indicum

The seed behind tahini and simit. It contains healthy fats, protein and lignans; small studies saw modest falls in cholesterol and blood pressure.

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### [Anise](https://herbadex.com/en/herb/anise/)

T Traditional use

Pimpinella anisum

Aniseed tea is traditionally used for mild digestive complaints such as bloating and wind, and for cough that comes with a cold.

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This page is for information only and is not medical advice. If you take medication, are pregnant, or have a health condition, talk to your doctor or pharmacist before use.