Hermetica Superfood Encyclopedia
Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.
Review flags: AWAITING_SEMANTIC_VALIDATION
Thymoquinone is the primary bioactive quinone compound found in Nigella sativa (black seed) that demonstrates anti-inflammatory and nephroprotective effects. It works primarily by inhibiting the NF-κB signaling pathway and reducing inflammatory cytokines like IL-8 and IgE.
Origin & History
Thymoquinone (TQ; 2-isopropyl-5-methyl-1,4-benzoquinone) is a monoterpenoid quinone and the primary bioactive compound in Nigella sativa L. (black cumin) seeds, constituting 30-48% of the essential oil. It is isolated via steam distillation or supercritical CO2 extraction and standardized in supplements to 2-5% in black cumin seed oil formulations like BCO-5.
Research Narrative (Provisional)
A phase I randomized, double-blind, placebo-controlled trial (n=70) tested BCO-5 standardized to 5% TQ at 200 mg/day for 90 days, finding no serious adverse effects and improvements in sleep/stress (PMID: 36518481). A comprehensive review of 76 trials (31 RCTs) confirmed efficacy of black seed/oil in asthma, chronic kidney disease, type 2 diabetes, and NAFLD, with TQ identified as the key constituent (PMID: 30087794).
Preparation & Dosage
Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.
Nutritional Profile
Thymoquinone (TQ) is a pure bioactive compound (2-isopropyl-5-methylbenzo-1,4-quinone), not a whole food, and therefore has no conventional macronutrient or micronutrient profile. Molecular weight: 164.20 g/mol. Chemical formula: C10H12O2. It is the primary bioactive constituent of Nigella sativa (black seed) volatile oil, typically constituting 30–48% of the total essential oil fraction. In black seed oil preparations, TQ concentration typically ranges from 0.4–2.5 mg/mL depending on extraction method and cultivar. As an isolated compound, it contains no fiber, protein, conventional vitamins, or dietary minerals. Bioactive properties are attributed to its quinone structure, which confers potent antioxidant activity via free radical scavenging (DPPH IC50 approximately 0.7–1.2 mg/mL in vitro). TQ also exhibits thymol and carvacrol-related terpenoid chemistry. Bioavailability notes: TQ is highly lipophilic (log P ≈ 2.5), resulting in poor aqueous solubility (~1 mg/mL in water) and limited oral bioavailability in native form. Peak plasma concentration (Cmax) in animal models reached approximately 4.5 µg/mL following 10 mg/kg oral dosing. Nanoencapsulation and lipid-based delivery systems (nanoemulsions, solid lipid nanoparticles) have demonstrated 2–5 fold improvements in bioavailability. First-pass hepatic metabolism is significant, with rapid conjugation and oxidative metabolism. Half-life estimated at 1–2 hours in rodent models; human pharmacokinetic data remains limited. Protein binding is approximately 99%, primarily to albumin, which may influence distribution and activity.
Reported Mechanism (Provisional)
Thymoquinone exerts its effects primarily through inhibition of the nuclear factor kappa B (NF-κB) signaling pathway, a key regulator of inflammatory responses. This quinone compound suppresses the production of pro-inflammatory cytokines including interleukin-8 (IL-8) and immunoglobulin E (IgE). The compound also appears to modulate oxidative stress pathways and may influence renal function markers through anti-inflammatory mechanisms.
Clinical Narrative (Provisional)
Clinical evidence for thymoquinone comes primarily from studies using black seed oil containing this compound. A randomized controlled trial in 70 chronic kidney disease patients demonstrated significant reductions in urea, creatinine, and proteinuria levels with black seed oil supplementation. The anti-inflammatory effects are supported mainly by mechanistic studies showing NF-κB pathway inhibition and cytokine reduction. Current clinical evidence is limited, with most benefits extrapolated from black seed oil studies rather than isolated thymoquinone trials.
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