Benefits
Lower CRP and TNF-alpha inflammation markers in black seed trials
A pooled review of 20 randomized trials (1,086 adults) found black seed supplements lowered blood CRP and TNF-alpha and raised antioxidant enzymes, while IL-6 did not change significantly. The trials used various Nigella sativa products, not ThymoQuin.
Blood pressure support in black seed oil trials
In 70 healthy adults, 5 mL a day of black seed oil for 8 weeks lowered systolic and diastolic blood pressure compared with placebo, and a pooled review found average drops of about 3 mmHg systolic and 2.7 mmHg diastolic with large differences between studies. A 28-day seed extract trial in older adults found no significant difference from placebo. None used ThymoQuin.
Waist size and body weight in a black seed oil trial
In 60 adults with coronary artery disease, 2 g a day of black seed oil for 8 weeks lowered body weight (about 1.8 kg), waist size (about 2.2 cm) and blood pressure more than a sunflower oil placebo. Fasting blood sugar fell about 4.3 mg/dL, but the reported range for that result included no change. This was one small trial of a generic oil, not ThymoQuin.
Seasonal nasal symptoms and breathing tests in black seed trials
In 65 adults with seasonal allergy symptoms, a black seed oil with 5% thymoquinone plus piperine eased nasal and eye symptoms more than placebo over 15 days. In adults with partly controlled asthma, black seed added to inhaled therapy improved some lung function tests in a single-blind trial. Neither used ThymoQuin.
Respiratory and nasal complaints in runners taking ThymoQuin
In a 4-week double-blind trial in 37 recreational runners around a half-marathon or marathon, 500 mg a day of ThymoQuin led to 62% fewer reported complaints such as cough, sore throat and nasal congestion than placebo, plus better mood scores and lower saliva cortisol. The study was small, funded by TriNutra and published in a journal not indexed in PubMed.
Mechanism of action
Thymoquinone and inflammation signaling
Thymoquinone is the main studied compound in black seed oil. In human trials pooled in a review, black seed lowered CRP, TNF-alpha and the oxidative stress marker MDA and raised antioxidant enzymes such as SOD and glutathione peroxidase, which fits an anti-inflammatory and antioxidant action.
Why standardization matters
Black seed oils differ in how much thymoquinone they contain, so trial results with one oil may not carry over to another. ThymoQuin fixes thymoquinone at 3%, but whether that gives better results than other black seed oils has not been tested in people.
Clinical trials
Randomized, double-blind, placebo-controlled trial of 2.5 mL Nigella sativa oil twice daily for 8 weeks; generic oil, not ThymoQuin. (Fallah Huseini et al. 2013, Phytother Res)
70 healthy adults aged 34 to 63 with systolic blood pressure of 110 to 140 mmHg.
Systolic and diastolic blood pressure fell significantly compared with baseline and with placebo. Liver and kidney tests did not change and no adverse effects were reported.
Randomized, double-blind trial of 2 g Nigella sativa oil a day versus sunflower oil placebo for 8 weeks; generic oil, not ThymoQuin. (Tavakoli-Rouzbehani et al. 2021, Phytother Res)
60 adults with coronary artery disease in Iran.
Compared with placebo, black seed oil lowered weight (about 1.8 kg), waist size (about 2.2 cm), systolic blood pressure (about 9.5 mmHg), diastolic blood pressure (about 8.3 mmHg) and fasting blood sugar (about 4.3 mg/dL, with a confidence interval that included no change).
Single-blind, randomized, placebo-controlled trial of 1 g or 2 g Nigella sativa a day for 3 months added to inhaled maintenance therapy; not ThymoQuin. (Salem et al. 2017, Ann Saudi Med)
76 adults with partly controlled asthma in Saudi Arabia.
Peak flow variability improved with both doses versus placebo, and FEV1 rose with 2 g a day. Asthma control scores, the breath test FeNO and IgE improved compared with baseline, and fewer people had flare-ups on 1 g a day.
Randomized, double-blind, placebo-controlled trial of 250 mg Nigella sativa oil with 5% thymoquinone plus 2.5 mg piperine twice daily for 15 days; a different maker's oil, not ThymoQuin. (Majeed et al. 2024, Medicine (Baltimore))
65 adults aged 18 to 60 with seasonal allergy symptoms in India.
Nasal and eye symptom scores fell more than with placebo, and symptom episodes per day dropped further. Serum IgE was not significantly different from placebo. No clinically significant lab changes were seen. Most authors work for the oil's maker.
Systematic review and meta-analysis of randomized trials of Nigella sativa supplements on inflammation and oxidative stress markers; various black seed products, not ThymoQuin. (Kavyani et al. 2023, Inflammopharmacology)
20 randomized trials with 1,086 adults.
Black seed lowered CRP, TNF-alpha and MDA and raised total antioxidant capacity, glutathione peroxidase and SOD. IL-6 did not change significantly.
Randomized, double-blind, placebo-controlled trial of 500 mg/day ThymoQuin (3% thymoquinone) or maltodextrin for 4 weeks, 3 weeks before and 1 week after a race; only the 37 completers were analyzed. Funded by TriNutra; the authors own the contract research firm that ran it, and one is employed by a company selling a supplement that contains black cumin seed oil. The cited registry entry (NCT05508529), filed after the study ended, describes a six-arm, 120-person study, of which the paper reports the ThymoQuin and placebo arms. Not indexed in PubMed. (Talbott et al. 2022, Food Sci Nutr Res)
40 recreational runners enrolled; 37 completed.
Reported upper-respiratory complaints such as cough, sore throat and congestion were 62% lower than with placebo, global mood was 11% better and saliva cortisol was 44% lower after supplementation. No adverse events were reported in either group.
Randomized, placebo-controlled, parallel-group trial of 500 mg a day of ThymoQuin (3.15% thymoquinone in the batch used) or a matched placebo for 8 weeks in moderately stressed but otherwise healthy adults; the article does not report the number of participants or whether it was blinded. Funded by TriNutra, which also supplied the product and placebo, and run by the authors' firm, 3 Waves Wellness; published in a journal not indexed in PubMed. A registry entry by the same investigator (NCT06950424) planned 40 participants. (Talbott et al. 2026, EC Nutrition)
Moderately stressed but otherwise healthy adults.
Vigor scores (p=0.04) and sleep quality scores (p=0.02) improved in the ThymoQuin group over 8 weeks, with little change on placebo. Salivary cortisol fell about 23% and DHEA rose about 10%, but neither change was statistically significant (p=0.26 and p=0.24), nor was the rise in the DHEA to cortisol ratio (p=0.25). A combined stress resilience score, which the authors built for this study and call experimental, improved.
Double-blind, randomized, placebo-controlled trial of 300 mg Nigella sativa seed extract twice daily for 28 days; a seed extract, not ThymoQuin. (Rizka et al. 2017, Acta Med Indones)
76 older adults with high blood pressure in Indonesia.
Blood pressure fell in both groups, and the difference from placebo was not significant for systolic (p=0.36) or diastolic (p=0.35) pressure. Reported side effects included indigestion, nausea and constipation.