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What Is Thymoquinone?A Buyer's Guide to TQ in Black Seed Oil

Understand what thymoquinone is, how it's measured, why it varies between batches, and what to look for when evaluating wholesale suppliers.

Last updated: May 8, 2026

What Is Thymoquinone (TQ)?

Thymoquinone (TQ) is the primary compound referenced on Nigella sativa (black seed oil) COA documents. It is the most commonly cited compound in published research on Nigella sativa and the primary parameter buyers use to evaluate the oil for supplement, food, and private label use.

TQ is a naturally occurring phytochemical — a type of benzoquinone — that forms during the seed's natural growth cycle. It is not added during processing; it is an inherent part of the oil's natural composition.

For wholesale buyers, thymoquinone content is a key quality indicator and often the primary differentiator between suppliers.

How Is TQ Measured?

Thymoquinone content is determined through laboratory analysis, typically using one of these methods:

GC-MS

Gas Chromatography–Mass Spectrometry. Widely used method for analyzing volatile compounds in essential and fixed oils. Provides detailed compositional breakdown.

HPLC

High-Performance Liquid Chromatography. Another standard analytical method used to quantify specific compounds like thymoquinone with high precision.

TQ content is reported as a percentage of the total oil composition. This data appears on the Certificate of Analysis (COA) issued for each batch.

Important: TQ percentage varies naturally between batches. Seed origin, harvest timing, climate, and processing conditions all affect TQ levels. Any supplier claiming a single fixed TQ percentage for all batches should be approached with caution.

Why TQ Varies Between Batches

Thymoquinone is a natural compound, not an additive. Its concentration varies based on biological and environmental factors:

  • Seed variety and genetic profile
  • Growing region and soil conditions
  • Climate and harvest timing
  • Post-harvest handling and storage
  • Extraction method and parameters

This is normal and expected for any natural oil. The important thing is that each batch is tested and documented individually, so buyers know exactly what they're receiving.

What to Look For on a COA

When evaluating a supplier's Certificate of Analysis, look for the following:

Good Signs

  • Batch number clearly stated
  • Thymoquinone percentage listed with testing method (HPLC, GC-MS, or UPC²)
  • Date of analysis
  • Lab name or third-party testing reference
  • Full fatty acid profile
  • Extraction method specified

Warning Signs

  • No batch number or generic "typical" specs
  • Single fixed TQ% claimed for all products
  • No testing method specified
  • No date of analysis
  • Unable to provide COA on request
  • Marketing language instead of lab data

Standard vs. High-Potency TQ Profiles

Black seed oil generally falls into two broad potency profiles:

Standard Profile

General-purpose oil suitable for supplement, food, and private label applications. This is the most commonly traded profile in wholesale markets.

Best for: Retail bottles, dietary supplements, food products, private label brands

High-Potency Profile

Oil with elevated thymoquinone content, typically from specific seed selections or extraction parameters. Higher price point.

Best for: Premium supplement lines, clinical-grade applications

At Chestnut Supply, we offer both profiles. Contact us with your requirements and we'll match you with the right batch and provide the corresponding COA.

How We Handle Thymoquinone Documentation

Our approach to TQ is straightforward:

  • Batch-specific testing
    Every batch is tested individually. Our standard oil typically runs 1.2–2.4% TQ; your batch’s exact value is stated on its COA.
  • COA with every order
    Your order includes a Certificate of Analysis with the actual TQ content for your specific batch.
  • Testing method documented
    Our COA states the testing methodology used (HPLC, GC-MS, or UPC²) so you can verify with your own lab if needed.
  • Pre-order COA samples
    You can request a sample COA before placing an order to verify our documentation standards.
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Thymoquinone FAQ

What is a good TQ percentage in black seed oil?

Standard cold-pressed black seed oil typically contains 1.0-2.5% thymoquinone. Oils marketed as 'High TQ' may contain 2.5-3.0% or higher. The right level depends on your formulation requirements.

How do I verify TQ percentage?

Request a batch-specific Certificate of Analysis (COA) from your supplier. The COA should list thymoquinone content as a percentage. Avoid suppliers who only provide generic or outdated COAs.

Does TQ percentage decrease over time?

Thymoquinone can degrade with exposure to heat, light, and oxygen. Proper storage in dark containers at controlled temperatures preserves TQ content throughout the product's shelf life.

What TQ level does Chestnut Supply offer?

Our standard cold-pressed black seed oil contains 1.2-2.4% thymoquinone. We also offer High TQ options with up to 3% for customers requiring higher potency. Every batch ships with a COA.

Source Black Seed Oil with Verified TQ Data

Get batch-specific COA, thymoquinone documentation, and wholesale pricing from a manufacturer-direct supplier.

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