What is thymoquinone?

Thymoquinone is a bioactive phytochemical found mainly in Nigella sativa (black cumin) seed oil. It is studied for antioxidant and anti-inflammatory effects.

What are the potential benefits of thymoquinone?

Research suggests antioxidant and anti-inflammatory activity, with experimental findings in areas like neuroprotection, liver protection, metabolic support, and anticancer mechanisms. Strong clinical evidence in humans is still limited.

How much thymoquinone is typically used?

Supplement amounts are often described as thymoquinone content within black cumin oil. A commonly referenced range is about 10–50 mg per day as thymoquinone, but there are no formal clinical guidelines.

Is thymoquinone safe for everyone?

Safety depends on dose, product quality, and individual health conditions. People who are pregnant or breastfeeding, have bleeding disorders, or take prescription medications should consult a clinician before use.

Can thymoquinone interact with medications?

It may interact with medicines that affect blood sugar, blood pressure, or blood clotting due to overlapping physiological effects. If you take these medications, discuss use with a healthcare professional.

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Thymoquinone

Limited research available·3/10

A higher score indicates better study conditions, but not necessarily effectiveness.

Thymoquinone is the main active compound in black cumin (Nigella sativa) oil, with antioxidant, anti-inflammatory, and experimental anticancer properties.

Anti-inflammatory Cardiovascular Support Cancer-inhibitor Antioxidant Glucose Metabolism Neuroprotective Liver Health

dose range

10–50 mg (as thymoquinone in black cumin oil)

1–2 doses daily with meals

Consumption

Take with food, ideally as part of a whole black cumin oil supplement rather than as isolated thymoquinone.

Fat-soluble: take with fat.

Best time

Best taken with first or second main meal for absorption.

Description

Thymoquinone is a phytochemical primarily found in Nigella sativa (black cumin) oil. It is being researched for its antioxidant, anti-inflammatory, and multi-system protective effects but lacks formal clinical guidelines for supplementation.

benefits

Main effects with level of evidence

Limited

Note on evidence

Most evidence is from cell, animal, and limited small human studies; robust clinical trials are lacking.

Anticancer potential (experimental)

Limited

Thymoquinone may promote apoptosis (programmed cell death) and inhibit tumor growth in animal and cell studies, though human data is lacking.

Particularly relevant for: Cancer research · General adult population

S2 · PubMed: Thymoquinone anticancer effects

Neuroprotective effects

Limited

May reduce oxidative stress and brain inflammation, with possible relevance to neurodegenerative conditions based on preliminary studies.

Particularly relevant for: Aging adults · Neurodegenerative disease research

S3 · PubMed: Thymoquinone in neuroprotection

Liver protective effects

Limited

Protects liver tissue from damage in animal models, possibly through antioxidant and anti-inflammatory mechanisms.

Particularly relevant for: Individuals at risk of liver damage · General adult population

S4 · PubMed: Thymoquinone hepatoprotective effect

Blood sugar support (preliminary)

Limited

May improve glucose metabolism in some animal and pilot human studies; clinical relevance in humans remains uncertain.

Particularly relevant for: Individuals with impaired glucose tolerance

S5 · Healthline: Black seed oil scientific review S8 · Examine.com: Black seed oil summary

Potential cardiovascular benefits

Limited

Early research suggests possible benefits for cholesterol and heart health, but strong evidence in humans is not yet available.

Particularly relevant for: Individuals seeking cardiovascular support

S5 · Healthline: Black seed oil scientific review S8 · Examine.com: Black seed oil summary

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Isolated thymoquinone safety is not well established in humans; most information is from black cumin oil studies.

warning notices

Most adverse effects reported are rare and from high doses in animal experiments or isolated cases of allergic reaction.
Safety in children, pregnant, or breastfeeding individuals is unknown; avoid use.
Potential to interact with medications that affect bleeding or blood sugar.
Do not use isolated thymoquinone supplements in pregnancy or lactation due to lack of safety data.
Avoid use with anticoagulant or antiplatelet drugs due to potential bleeding risk.
Use only under healthcare supervision in people with liver or kidney disease.
Monitor blood sugar when using with antidiabetic medications.

Known interactions with medications

Anticoagulants/antiplatelets
Antidiabetic medications

Contraindications / special precautions

Pregnancy
Breastfeeding
Pre-existing liver or kidney disease
Allergy to Nigella sativa

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Interactions are mainly theoretical based on mechanistic data from black cumin oil; caution is advised with certain drugs.

Potential additive bleeding risk with anticoagulant or antiplatelet drugs.

drug · Anticoagulants/antiplatelet medications

CautionLimited

Why

Thymoquinone may have antiplatelet effects that could enhance bleeding risk when combined with these medications.

recommendation

Avoid or use only under medical supervision if on blood thinners.

S6 · WebMD: Black cumin background and safety S7 · NIH ODS: Black seed oil (general)

May enhance effects of antidiabetic drugs.

drug · Antidiabetic medications

MonitorLimited

Why

Thymoquinone may lower blood sugar, potentially leading to hypoglycemia with other antidiabetic drugs.

recommendation

Monitor blood sugar and adjust diabetes medication only with professional guidance.

S5 · Healthline: Black seed oil scientific review S7 · NIH ODS: Black seed oil (general)

Possible risk with liver or kidney conditions.

lifestyle · Pre-existing liver or kidney disease

CautionLimited

Why

There is insufficient safety data on isolated thymoquinone in these populations; possible risk of adverse effects.

recommendation

Consult a clinician before use.

S6 · WebMD: Black cumin background and safety S7 · NIH ODS: Black seed oil (general)

mechanisms of action

Brief explanations of how it works

Antioxidant activity

Thymoquinone scavenges free radicals and boosts endogenous antioxidant enzymes, contributing to tissue protection.

S1 · PubMed: Thymoquinone pharmacological properties

Anti-inflammatory effects

Suppresses pro-inflammatory cytokines and mediators, potentially reducing chronic inflammation.

S1 · PubMed: Thymoquinone pharmacological properties

Apoptosis induction in cancer cells

Triggers programmed cell death and inhibits proliferation in various cancer cell models; not confirmed in humans.

S2 · PubMed: Thymoquinone anticancer effects

Neuroprotection via oxidative stress modulation

Reduces neuronal damage by lowering oxidative and inflammatory markers in several models.

S3 · PubMed: Thymoquinone in neuroprotection

Sources & References

Primary literature and reviews on which these statements are based

8 sources

PubMed: Thymoquinone pharmacological properties

PubMed: Thymoquinone anticancer effects

PubMed: Thymoquinone in neuroprotection

PubMed: Thymoquinone hepatoprotective effect

Healthline: Black seed oil scientific review

WebMD: Black cumin background and safety

NIH ODS: Black seed oil (general)

General health and safety profile

Examine.com: Black seed oil summary

Summary of clinical research

Last updated: February 1, 2026

This information is for educational purposes only and does not replace medical advice.