Black cumin (thymoquinone) — The Autophagy-Inducing Quinone

Thymoquinone (TQ) exerts its cellular effects primarily through the modulation of key metabolic and inflammatory pathways. It induces autophagy and regulates cellular energy homeostasis by activating the AMPK/mTOR signaling pathway. TQ also acts as a potent anti-inflammatory agent by suppressing the activation of nuclear factor-kappa B (NF-κB) and inhibiting the production of pro-inflammatory cytokines. Additionally, it exhibits antioxidant properties by scavenging reactive oxygen species (ROS) and upregulating endogenous antioxidant enzymes, thereby mitigating oxidative stress-induced cellular damage.

Human trials of thymoquinone (TQ) primarily focus on its safety, anti-inflammatory, and metabolic effects rather than direct longevity outcomes. A Phase I clinical trial demonstrated that a TQ-rich black cumin oil extract (BCO-5) is safe and well-tolerated at 200 mg/day for 90 days in healthy adults. Other clinical studies have explored its efficacy in managing hypertension, dyslipidemia, and asthma, showing modest improvements in metabolic markers. No published human longevity trials exist.

200–900 mg/day of thymoquinone-rich black cumin oil extract (standardised to 5% TQ) is the most studied range in humans for safety and efficacy. Alternatively, 1–3 grams of cold-pressed black seed oil daily is commonly used. Best taken with food to enhance absorption.

Generally recognized as safe when consumed in standard dietary or supplemental doses (up to 900 mg/day of extract). Mild gastrointestinal upset or nausea may occur in some individuals. Due to its potential to lower blood pressure and blood sugar, it should be used with caution in individuals taking antihypertensive or antidiabetic medications. Pregnant and breastfeeding women should avoid high-dose supplementation due to a lack of safety data.

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