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Herbs and plants

Black seed oil — “cure-all” or overrated oil?

Sources: 13 · Article: 16 108 characters

Henryk Różański attributes effects on many ailments to black seed oil, from infections to skin problems.

  • Henryk Różański also lists effects on immunity, inflammation, allergies, blood glucose, and circulation.
  • Hubert Czerniak describes possible relief from hay fever, asthma, and atopic skin conditions.
  • For type 1 diabetes, however, it is stated that there is a lack of reliable studies in patients.

What the authors write

Henryk Różański

The oil is said to have antiparasitic, antibacterial, and antifungal effects, and to be used for many skin and digestive problems.

„It then retains its strong antiparasitic, antibacterial, and antifungal properties. It also kills disease-causing protozoa. In the intestines, it inhibits the growth of Candida. It acts against parasites when taken on an empty stomach. Its taste is slightly pungent and distinctive, somewhat reminiscent of thymol.”Zachowuje wówczas swoje silne właściwości przeciwpasożytnicze, antybakteryjne i przeciwgrzybicze. Zabija również pierwotniaki chorobotwórcze. W jelitach hamuje rozwój Candida. Na pasożyty działa po spożyciu na czczo. W smaku jest lekko drapiący i specyficzny, nieco przypominający tymol.
Cottbus cz. III, Schwarckümmelöl Plus
Henryk Różański

The oil is said to have anticancer, antifungal, antibacterial, and antiprotozoal effects, and to support immunity.

„In general, black seed oil that has not been stripped of its essential oil is an anticancer, antifungal, antibacterial, and antiprotozoal agent. It stimulates the immune system and inhibits the growth of yeast. It increases bile production. It activates the body’s renewal and detoxification processes.”Generalnie olej czarnuszkowy nie pozbawiony olejku eterycznego jest środkiem przeciwnowotworowym, przeciwgrzybiczym, antybakteryjnym i pierwotniakobójczym. Stymuluje układ odpornościowy, hamuje rozwój drożdżaków. Zwiększa produkcję żółci. Aktywuje procesy odnowy i odtruwania organizmu.
Psianka – Solanum, oczar – Hamamelis, naparstnica – Digitalis, czarnuszka – Nigella i miłorząb – Ginkgo – zwiastuny jesieni w ogródku luskiewnika
Henryk Różański

The oil is said to inhibit inflammation and pain, have antiallergic effects, and affect glucose levels and circulation.

„Black seed oil inhibits inflammation and has pain-relieving and antiallergic effects. It inhibits immune self-attack processes. It supports detoxification and cell renewal. It inhibits blood cell aggregation and has anti-heart-attack and antithrombotic effects. It improves blood flow through the blood vessels.”Olej czarnuszkowy hamuje stany zapalne, działa przeciwbólowo i przeciwalergicznie. Hamuje procesy autoagresji immunologicznej. Wspomaga detoksykację i odnowę komórek. Hamuje agregację krwinek i działa przeciwzawałowo i przeciwzakrzepowo. Poprawia przepływ krwi przez naczynia krwionośne.
Cottbus cz. III, Schwarckümmelöl Plus
Henryk Różański

The description of black seed lists saponins, alkaloids, essential oil, thymoquinone, and fixed oil.

„The black seeds contain saponins, alkaloids, essential oil, thymoquinone, polythymoquinone, quercetin, kaempferol, plenty of the amino acid valine, and valuable fixed oil. Black seed, Wolsztyn, 27 July 2008 Black seed – Nigella – fruit – Swarzędz, 3 August 2008”W czarnych nasionkach zawiera saponiny, alkaloidy, olejek eteryczny, tymochinon, politymochinon, kwercetynę, kemferol, sporo aminokwasu waliny i cenny olej tłusty. Czarnuszka, Wolsztyn 27 lipiec 2008 Czarnuszka – Nigella – owoc – Swarzędz 3 sierpień 2008
Cottbus cz. III, Schwarckümmelöl Plus
Henryk Różański

For type 1 diabetes, it is stated that there is a lack of reliable randomized controlled trials in patients.

„Thymoquinone has documented immunomodulatory properties (it inhibits NF-κB, TNF-α, IL-6, and IL-1β), making it a potentially interesting treatment for type 1 diabetes (T1D), but reliable RCTs in patients with type 1 diabetes are still lacking. Black seed oil with a strong smell and taste (whole, unrefined) should be taken regularly, 1 teaspoon twice a day.”Tymochinon posiada udokumentowane właściwości immunomodulujące (hamuje NF-κB, TNF-α, IL-6, IL-1β), co czyni go potencjalnie interesującym lekiem w cukrzycy 1 ( T1D), lecz nadal brakuje wiarygodnych RCT u pacjentów z cukrzycą typu 1. Olej z czarnuszki o silnym zapachu i smaku (pełny, bez rafinacji) należy przyjmować regularnie po 1 łyżeczce 2 razy dziennie.
Zioła przeciwcukrzycowe jako alternatywy dla leków hipoglikemicznych syntetycznych, cz. VII. Zioła przydatne w leczeniu cukrzycy typu 1
Henryk Różański

Black seed oil is listed as an additional immunostimulant used for Lyme disease.

„Take an additional immunostimulant orally at the same time in the form of black seed oil – Oleum Nigellae (available in oil shops, for example in BlueCity in Warsaw, and in many online shops) – 1 teaspoon 3 times a day. I advise against buying encapsulated oil or oil without its distinctive smell and sharp, somewhat thymol-like taste.”Doustnie przyjmować równocześnie dodatkowy immunostymulator w postaci Oleju z czarnuszki – Oleum Nigellae (dostępny w sklepach z olejami, np. w BlueCity w Warszawie, w wielu sklepach internetowych) – 1 łyżeczka 3 razy dziennie. Odradzam kupować olej kapsułkowany lub pozbawiony specyficznego zapachu i ostrego, nieco tymolowego smaku.
Borelioza – Borreliosis – fitoterapia, cz. IV
Henryk Różański

Black seed oil with 10% clove oil is described as acting against Demodex and inhibiting the growth of fungi and bacteria.

„Black seed oil containing 10% clove oil destroys Demodex and, when taken orally (1 tablespoon), inhibits the growth of fungi (e.g. Candida) and bacteria. Black seed oil (always buy one that contains essential oil as well as fixed oil and has a sharp taste; black seed oil without smell or taste, purified of thymoquinones, is of little value for medicinal purposes) with added clove oil (10%), taken orally (on an empty stomach), has antiparasitic and bile-stimulating effects.”Olej czarnuszkowy zawierający 10% olejku goździkowego niszczy nużeńca, a przyjęty doustnie (1 łyżka) działa hamująco na rozwój grzybów (np. Candida) i bakterii. Olejek czarnuszkowy (zawsze należy kupować ten zawierający obok oleju tłustego także olejek eteryczny, o ostrym smaku; olejek czarnuszkowy pozbawiony zapachu i smaku, oczyszczony z tymochinonów jest mało wartościowy do celów leczniczych) z dodatkiem olejku goździkowego (10%) zażyty doustnie (na czczo) wpływa przeciwpasożytniczo i żółciopędnie.
Flos Caryophylli – kwiat goździkowca, goździki
Hubert Czerniak

Black seed is said to relieve symptoms of hay fever, asthma, and atopic dermatitis.

„It is also worth trying black seed, which effectively relieves the symptoms of atopic dermatitis and hay fever. Black seed contains thymoquinone, which has anti-inflammatory, antibiotic, and antifungal effects. It improves lung function and relieves the symptoms of bronchial asthma.”Warto sięgnąć także po czarnuszkę, która skutecznie łagodzi objawy atopowego zapalenia skóry i kataru siennego. Czarnuszka zawiera substancję tymochinon, która działa przeciwzapalnie, antybiotycznie i przeciwgrzybiczo. Poprawia wydolność płuc i łagodzi objawy astmy oskrzelowej.
Alergia z głowy. Część 2
Hubert Czerniak

Black seed oil is described as being associated with the disappearance of hay fever, shortness of breath, and atopic skin conditions in people who take it.

„Studies have shown that people taking black seed oil experienced the disappearance of hay fever, shortness of breath, and atopic skin conditions. Chamomile lowers histamine levels and soothes the conjunctiva, helping to reduce itchy and watery eyes. Thyme has antibacterial and expectorant effects and thins accumulated phlegm.”Badania wykazały, że u osób przyjmujących olej z czarnuszki ustąpiły: katar sienny, duszności oraz zmiany atopowe na skórze. Rumianek obniża poziom histaminy, działa kojąco na spojówki – pomoże ograniczyć swędzenie i łzawienie oczu. Tymianek działa antybakteryjnie, wykrztuśnie i rozrzedza zalegającą flegmę.
Alergia z głowy. Część 2
Hubert Czerniak

Black seed is said to relieve symptoms of hay fever, asthma, and atopic dermatitis.

„It is also worth trying black seed, which effectively relieves the symptoms of atopic dermatitis and hay fever. Black seed contains thymoquinone, which has anti-inflammatory, antibiotic, and antifungal effects. It improves lung function and relieves the symptoms of bronchial asthma.”Warto sięgnąć także po czarnuszkę, która skutecznie łagodzi objawy atopowego zapalenia skóry i kataru siennego. Czarnuszka zawiera substancję tymochinon, która działa przeciwzapalnie, antybiotycznie i przeciwgrzybiczo. Poprawia wydolność płuc i łagodzi objawy astmy oskrzelowej.
Alergia z głowy. Część 2
Hubert Czerniak

Black seed oil is described as being associated with the disappearance of hay fever, shortness of breath, and atopic skin conditions in people who take it.

„Studies have shown that people taking black seed oil experienced the disappearance of hay fever, shortness of breath, and atopic skin conditions. Chamomile lowers histamine levels and soothes the conjunctiva, helping to reduce itchy and watery eyes. Thyme has antibacterial and expectorant effects and thins accumulated phlegm.”Badania wykazały, że u osób przyjmujących olej z czarnuszki ustąpiły: katar sienny, duszności oraz zmiany atopowe na skórze. Rumianek obniża poziom histaminy, działa kojąco na spojówki – pomoże ograniczyć swędzenie i łzawienie oczu. Tymianek działa antybakteryjnie, wykrztuśnie i rozrzedza zalegającą flegmę.
Alergia z głowy. Część 2

Research from PubMed · Europe PMC

We selected 5 studies with the best, positive results. This is a selection, not a full review of all research.

Total number of studies on this topic in PubMed: 930.

A meta-analysis of 16 studies found that black seed lowered fasting glucose, HbA1c, total cholesterol, and LDL in people with type 2 diabetes.

Aim of the study: Black seed is known for its health benefits in traditional medicine. While recent studies suggest it may improve cardiometabolic health, its impact on type 2 diabetes mellitus (T2DM) remains unclear. This study aims to meta-analysis randomized controlled trials (RCTs) to assess the effects of black seed supplementation on cardiometabolic indices in T2DM patients.

Results: The pooled meta-analysis of 16 RCTs showed that black seed supplementation significantly reduced fasting blood glucose (FBG) (MD: -21.43 mg/dL; p = 0.005), hemoglobin A1c (HbA1c) (MD: -0.44; p = 0.01), total cholesterol (TC) (MD: -18.80 mg/dL; p = 0.04) and low-density lipoprotein (LDL) (MD: -19.53 mg/dL; p = 0.003). No significant effects were observed for 2-hour postprandial glucose (2-hpp), fasting insulin, homeostatic model assessment (HOMA), triglycerides (TG), high-density lipoprotein (HDL), aspartate aminotransferase (AST), alanine aminotransferase (ALT), creatinine, and body weight, or body mass index (BMI). Subgroup analyses revealed that black seed supplementation effectively reduced FBG for longer than 8 weeks; additionally, HbA1c, HOMA, and LDL in higher doses (>1 g/day), shorter durations (≤8 weeks), and use of the oil form. Black seed supplementation appears to significantly improve FBG, HbA1c, TC, and LDL levels in patients with T2DM.

Effects of black seed (Nigella sativa L.) on cardiometabolic indices in type 2 diabetic patients: A systematic review and meta-analysis of RCTs. · Complement Ther Med 2025
Money for the studynot stated
Do the authors have ties to companies?not stated
Did a manufacturer help with the study?unknown
Type of studycombined analysis of many studies (meta-analysis)

“Not stated” does not mean nobody paid — the database does not always record it.

A meta-analysis of clinical studies found that black seed supplementation lowered fasting glucose, post-meal glucose, and HbA1c.

Aim of the study: This study was aimed to quantify the antihyperglycemic effect of Nigella sativa (N. sativa).

Results: To sum up, N. sativa consumption has a significant lowering effect on glycemic status. Further studies with prolonged durations and powerful design are needed to specify the exact mechanism, optimal dosage, and duration of N. sativa supplementation to obtain a beneficial effect on glycemic status.

Effect of Nigella sativa (black seed) supplementation on glycemic control: A systematic review and meta-analysis of clinical trials. · Phytother Res 2019
Money for the studynot stated
Do the authors have ties to companies?not stated
Did a manufacturer help with the study?unknown
Type of studycombined analysis of many studies (meta-analysis)

“Not stated” does not mean nobody paid — the database does not always record it.

A meta-analysis of 17 studies found that black seed lowered total cholesterol, LDL, and triglycerides, but did not significantly affect HDL.

Aim of the study: The effects of Nigella sativa (NS) on plasma lipid concentrations are controversial. A systematic review and meta-analysis of randomized controlled trials (RCTs) was conducted to obtain a conclusive result in humans.

Results: No significant effect on HDL-C concentrations (WMD: 0.28mg/dL, 95% CI: -1.96, 2.53, p=0.804) was found. A greater effect of NS seed oil versus seed powder was observed on serum total cholesterol and LDL-C levels, and an increase in HDL-C levels was found only after NS seed powder supplementation. NS has a significant impact on plasma lipid concentrations, leading to lower total cholesterol, LDL-C, and TG levels while increased HDL-C is associated with NS powder only. Further RCTs are needed to explore the NS benefits on cardiovascular outcomes.

Nigella sativa (black seed) effects on plasma lipid concentrations in humans: A systematic review and meta-analysis of randomized placebo-controlled trials. · Pharmacol Res 2016
Money for the studynot stated
Do the authors have ties to companies?not stated
Did a manufacturer help with the study?unknown
Type of studycombined analysis of many studies (meta-analysis)

“Not stated” does not mean nobody paid — the database does not always record it.

In a study involving women with PCOS, black seed oil lowered IL-6 and fasting glucose levels and shortened the interval between periods.

Aim of the study: Polycystic ovary syndrome (PCOS) is a complex endocrine and metabolic disorder that affects 5%-10% of women of reproductive age. Supplements with potential anti-inflammatory properties, such as Nigella sativa oil, have been proposed as adjunctive therapies that may improve selected metabolic and inflammatory features of PCOS. This study investigated the effect of N.

Results: Sixty women with PCOS were randomized equally to the intervention and placebo groups. After baseline adjustment, serum IL-6 (adjusted mean difference -4.21; 95% CI -6.34 to -2.08; p < 0.001) and fasting blood glucose (adjusted mean difference -8.16 mg/dL; 95% CI -12.73 to -3.58; p < 0.001) were significantly lower in the N. sativa group than in the placebo group. No significant between-group differences were observed for fasting insulin, HOMA-IR, QUICKI, luteinizing hormone, or total testosterone. The intermenstrual interval was significantly shorter in the intervention group, whereas menstrual duration and other clinical manifestations showed no significant between-group differences. Twelve weeks of N. sativa oil supplementation were associated with significant improvements in inflammatory status and fasting blood glucose compared with placebo after baseline adjustment. However, no significant between-group effects were observed for insulin resistance indices or hormonal outcomes.

Nigella sativa (Black Seed) Oil Alleviates the Serum Levels of IL-6 and Insulin in Patients With Polycystic Ovary Syndrome. · J Obstet Gynaecol Res 2026
Money for the studynot stated
Do the authors have ties to companies?not stated
Did a manufacturer help with the study?unknown
Type of studystudy with random allocation to groups (RCT)
Participants60

“Not stated” does not mean nobody paid — the database does not always record it.

A review of clinical studies found improvements in some measures of periodontal health after black seed or thymoquinone preparations were used as an adjunct to treatment.

Aim of the study: Preparations of Nigella sativa and its major bioactive compound thymoquinone (TQ) possess antioxidant, antimicrobial, anti-inflammatory, and wound-healing properties. These characteristics suggest potential utility as adjuncts in the management of gingivitis, mucositis, periodontitis, and peri-implantitis. To critically evaluate the current clinical evidence regarding the use of Nigella sativa preparations and TQ in periodontal therapy.

Results: Fourteen exploratory clinical trials were identified. Overall, adjunctive use of Nigella sativa preparations or TQ was associated with improvements in clinical periodontal outcome measures. However, interpretation is limited by small sample sizes, methodological heterogeneity, short follow-up periods, and insufficient characterization of the investigational products. Only one of the studies adequately reported the administered daily TQ dose. Current clinical evidence remains preliminary and hypothesis-generating despite encouraging findings. Future confirmatory randomized controlled trials should employ well-characterized, TQ-standardized preparations and report the administered TQ dose to enable reproducibility, dose-response assessment, and evidence-based study planning.

Preliminary evidence of effectiveness of preparations from Nigella sativa and its leading compound thymoquinone in periodontal therapy. · Front Oral Health 2026
Money for the studynot stated
Do the authors have ties to companies?yes — the authors reported it
Did a manufacturer help with the study?YES
Type of studyreview of many studies

“Not stated” does not mean nobody paid — the database does not always record it.

Perspectives and opinion materials

The content below presents the authors’ opinions, interpretations and hypotheses. It is not treated as equal to scientific studies and systematic reviews.

Orthomolecular Medicine News Service Opinion material
„[31] Nigella sativa (black cumin) Nigella sativa (raw seeds or seed oil in capsules) is highly effective for the prevention, treatment and eradication of viral and bacterial infectious diseases, including hepatitis-C, helicobacter pylori and respiratory infections. Intake of nigella sativa seeds has shown to modulate the immune defense and reduce the risk of severe infections. Patients with common respiratory infections recover significantly faster when given nigella sativa. Consumption of 40mg/kg/d reduced the risk of symptomatic Covid-19 infections by more than 60%.”[31] Nigella sativa (black cumin) Nigella sativa (raw seeds or seed oil in capsules) is highly effective for the prevention, treatment and eradication of viral and bacterial infectious diseases, including hepatitis-C, helicobacter pylori and respiratory infections. Intake of nigella sativa seeds has shown to modulate the immune defense and reduce the risk of severe infections. Patients with common respiratory infections recover significantly faster when given nigella sativa. Consumption of 40mg/kg/d reduced the risk of symptomatic Covid-19 infections by more than 60%.
How to Prevent Sepsis Mortality: Part 2
Orthomolecular Medicine News Service Opinion material
„(2023) Evaluation of total black seed (Nigella sativa) extract efficacy in patients with irritable bowel syndrome - pilot study. Eur. Chem. Bull. 12:997-1006. Alizadeh A, Mohammah-Alizadeh-Charandabi S, Khodaie L, Mirghafourvand M. (2023) Effect of Nigella sativa L. seed oil on urinary incontinence and quality of life in menopausal women: A triple-blind randomized controlled trial. Phytother Res. 37:2012-2023. Kolahdooz M, Nasri S, Modarres SZ, et al. (2014) Effects of Nigella sativa L. seed oil on abnormal semen quality in infertile men: a randomized, double-blind, placebo-controlled clinical trial. Phytomedicine. 21:901-905.”(2023) Evaluation of total black seed (Nigella sativa) extract efficacy in patients with irritable bowel syndrome - pilot study. Eur. Chem. Bull. 12:997-1006. Alizadeh A, Mohammah-Alizadeh-Charandabi S, Khodaie L, Mirghafourvand M. (2023) Effect of Nigella sativa L. seed oil on urinary incontinence and quality of life in menopausal women: A triple-blind randomized controlled trial. Phytother Res. 37:2012-2023. Kolahdooz M, Nasri S, Modarres SZ, et al. (2014) Effects of Nigella sativa L. seed oil on abnormal semen quality in infertile men: a randomized, double-blind, placebo-controlled clinical trial. Phytomedicine. 21:901-905.
Black cumin plus vitamin D equals a top antiviral combination: The remarkable clinical versitility of Nigella sativa

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