Quality Assurance
At Sidr & Stone, quality isn't negotiable. Our black seed oil undergoes rigorous third-party testing to verify purity, potency, and authenticity — because you deserve to know exactly what you're putting in your body.
Independent lab testing
We partner with Analytice, an ISO 9001 certified laboratory in France, to independently verify our oil's thymoquinone (TQ) content — the key active compound responsible for black seed oil's properties.
Our latest results confirm:
- 2.67% thymoquinone concentration — among the highest available globally.
- 100% pure — no fillers, additives, or synthetic compounds.
- Cold-pressed — nutrients and bioactive compounds fully preserved.
Testing methodology
Our oil is analysed using HPLC-UV (High-Performance Liquid Chromatography with Ultraviolet Detection), a gold-standard technique that measures thymoquinone levels with ±5% accuracy.
Our lab certificate
- Test report: R/25/31283
- Test date: 5 August 2025
- Sample: Cold-pressed black seed oil (Nigella sativa)
- Result: 2.67% thymoquinone
- Laboratory: Analytice (ISO 9001:2015 certified)
Why Ethiopian seeds?
Not all black seed oil is equal. We source exclusively from Ethiopia, where the climate and soil produce Nigella sativa seeds with naturally elevated thymoquinone — often 2-3x higher than seeds from other regions. Our seeds are grown in high-altitude regions, hand-selected for size, colour, and oil content, and cold-pressed within weeks of harvest.
Cold-pressed & chemical-free
Our oil is extracted using traditional cold-pressing — no heat, no chemical solvents, no shortcuts. This preserves the essential fatty acids (Omega-3, 6, 9), volatile oils and aromatics, and naturally occurring vitamins and minerals, so the oil looks, smells, and tastes as nature intended.
Protected for freshness
Black seed oil is sensitive to light and air. We bottle ours in UV-protected matte black glass with airtight seals to prevent oxidation. Stored in a cool, dry place away from direct sunlight, it maintains peak potency for 12-18 months after opening.
Batch transparency
Every bottle is traceable to its source. For batch-specific information on your order, email info@sidrstone.com with your order number.
Our quality promise
- Third-party tested.
- No fillers or additives — 100% pure Nigella sativa oil.
- Ethically sourced from Ethiopian farmers.
- Cold-pressed to preserve bioactive compounds.
- Lab certificates available on request.
We believe in radical transparency. Questions about our testing, sourcing, or production? Contact us.