Yet, TQ is an interesting component of black seed oil. TQ stands for thymoquinone and is one of the key bioactive compounds found in the black cumin plant, *Nigella sativa*. It is precisely this substance that has been the subject of extensive scientific research in recent years.
But what exactly is TQ? What does it do in the body? And why might it be worth considering the TQ content when looking at black seed oil?
What is TQ?
TQ is short for thymoquinone. It is a natural compound found in the seeds of *Nigella sativa*, also known as black cumin or black seed.
Black seed naturally contains various plant compounds. TQ is one of the most studied components among them. Researchers are particularly interested in TQ's influence on processes related to oxidative stress and inflammation.
This makes TQ interesting, but it also sheds light on the composition of black seed oil.
When buying black seed oil, you likely look at factors such as its origin, the pressing method, and whether the oil is pure and cold-pressed. The TQ content can serve as an additional specification to consider.
What is oxidative stress?
To understand why TQ is so interesting, it helps to first look at oxidative stress.
So-called free radicals are constantly being produced in our bodies during normal metabolic processes. This is normal in itself, as the body possesses antioxidant systems that help keep these substances under control. Oxidative stress can occur when more free radicals are produced than the body can effectively neutralize. This can happen during normal metabolic processes, but also due to external factors such as air pollution, UV radiation, cigarette smoke, alcohol, and an unhealthy lifestyle.
Prolonged oxidative stress can affect cells and tissues. Consequently, oxidative stress is a key topic in research into health and aging processes.
What makes TQ interesting?
TQ is being extensively studied for its various biological properties. Particular attention is focused on the role of TQ in antioxidant and inflammation-related processes.
Laboratory studies indicate that TQ can influence various cellular mechanisms involved in oxidative stress and inflammatory processes.
However, researchers are not limiting themselves to laboratory studies; several human studies investigating black seed or *Nigella sativa* extracts have also been conducted.
This is significant, as it allows for a better understanding of the effects actually observed in humans.
What do human studies show?
A 2023 systematic review and meta-analysis combined the results of 20 randomized trials involving a total of 1,086 participants.
The researchers examined various markers associated with oxidative stress and inflammatory processes. The analysis revealed changes in markers such as CRP, TNF-α, MDA, and various antioxidant markers, including SOD, GPx, and TAC.
The results suggest that *Nigella sativa* can influence various processes involved in the balance between oxidative stress and the body's antioxidant defense system. An earlier meta-analysis from 2020 focused specifically on antioxidant markers. It pooled data from five randomized trials involving 293 participants. Among other findings, the researchers observed an improvement in SOD levels—a key component of the antioxidant defense system. Results for other markers were less conclusive.
This highlights why black seed and TQ are of interest to scientific research: they involve not just a single process, but various biological mechanisms.
Research extends beyond antioxidants
Interest in *Nigella sativa* is not limited to oxidative stress, however.
A large systematic review and meta-analysis from 2025 examined 82 studies involving a total of 5,026 participants. It investigated effects on parameters such as body weight and composition, blood pressure, blood sugar, insulin sensitivity, cholesterol levels, and various inflammatory markers.
Several analyses revealed beneficial changes in a number of these markers. However, results varied depending on the specific outcome and study.
This makes black seed interesting from a broader scientific perspective. Researchers are now investigating various aspects of the plant and its constituents.
Why is TQ specifically being studied?
Black seed contains multiple natural compounds. TQ is one of them—and a component that has been the subject of relatively extensive research.
Scientific reviews describe various potential mechanisms by which TQ may be involved in antioxidant and inflammation-related processes.
For this reason, TQ is often used as a key marker when researchers investigate the composition and biological properties of black seed.
Why is the TQ content of black seed oil significant?
This is where it becomes interesting for the consumer.
Most people buy black seed oil without ever checking for TQ. That is not surprising; TQ content is rarely listed on packaging, and many consumers are unaware that TQ is even a component of black seed oil.
Nevertheless, knowing the TQ content of an oil can be valuable.
After all, not all black seed oils are exactly the same. TQ levels can vary depending on factors such as the seeds used, their origin, processing, and the production method.
Research into commercial black seed oils has shown, for instance, that measured TQ levels can vary significantly between different oils. This makes a stated TQ content a useful piece of additional information regarding an oil's composition.
Why choose an oil with at least 2.5% TQ?
A TQ content of at least 2.5% provides the consumer with a clear product specification.
This ensures you know not only that you are purchasing black seed oil, but also provides extra information about one of the oil's most important, well-studied constituents.
At Mediqalshop, we offer black seed oil with a TQ content of at least 2.5%. We also carry a version with 3% TQ.
The difference between 2.5% and 3% does not automatically mean that one oil is “better” for everyone. This does mean, however, that the oil has a different stated TQ content.
For consumers who pay close attention to the composition of their black seed oil, such a specification can therefore be an important factor when making a choice.
TQ is more than just a percentage.
When you first hear about TQ, it might seem like just a technical percentage on a label.
But behind that percentage lies a natural substance that has been the subject of extensive scientific research.
TQ, or thymoquinone, is one of the key bioactive components of *Nigella sativa*. Research focuses, among other things, on its relationship with oxidative stress, antioxidant processes, and various inflammation-related and metabolic processes.
This gives the TQ content an interesting extra dimension when comparing different black seed oils.
What conclusions can we draw from the research?
Scientific interest in black seed and TQ has clearly grown in recent years. In particular, its influence on antioxidant processes, inflammation-related markers, and various aspects of metabolic health is being extensively studied.
The results from human studies and meta-analyses are interesting, showing positive changes in biomarkers across various areas. At the same time, the studies vary in terms of dosage, product form, duration, and composition.
For the consumer, the key takeaway is that black seed oil is not only a traditionally used natural product but also one whose various natural components are being scientifically investigated.
And TQ is one of the most interesting of these.
Comparing black seed oil? Look beyond just the name.
When comparing black seed oils, you can of course look at origin, purity, pressing method, and quality. However, when the TQ content is clearly stated, you gain an extra piece of information regarding the oil's composition.
That is why, at Mediqalshop, you will find black seed oil with a TQ content of at least 2.5% as well as a variant with 3% TQ.
This gives you a better understanding of what you are buying, allowing you to make a more informed comparison.
Natural power. Honest quality.
Scientific sources
The information in this article is based on scientific reviews and systematic reviews/meta-analyses concerning *Nigella sativa* and thymoquinone (TQ), including:
Kooti W. et al. – The effects of *Nigella sativa* on oxidative stress and antioxidant markers: systematic review and meta-analysis.
Pourmasoumi M. et al. – The effect of *Nigella sativa* on oxidative stress: a systematic review and meta-analysis.
Systematic review and meta-analysis (2025) on the effects of *Nigella sativa* on various cardiometabolic and inflammation-related markers.
Review of the preclinical and clinical effects of *Nigella sativa* and thymoquinone.
Review of the inflammation-related properties of thymoquinone.
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