Black Seed and Hashimoto's: Why This Plant Caught My Attention
Updated: 6 days ago
By Meryll Bettahar De Vos — Certified Naturopath & Wellness Coach specializing in natural support for Hashimoto’s
Published September 28, 2026
When it comes to natural support for Hashimoto’s, Nigella sativa, also known as black seed or black cumin, is a plant that holds a special place in my approach — and one I personally use.
Why? Because Nigella sativa brings together several properties that are particularly interesting for those of us living with Hashimoto’s: immunomodulatory, anti-inflammatory, antioxidant and antimicrobial properties, with potential benefits for thyroid function, the liver and digestive health.
And most importantly, Nigella sativa has actually been studied in people with Hashimoto’s, with some very interesting results.
A medicinal plant used for centuries
Nigella sativa has been used for centuries in traditional medicine, particularly in the Middle East, North Africa and parts of Asia. Its use goes all the way back to ancient times.
Today, researchers are especially interested in one of its main active compounds: thymoquinone. Thymoquinone has been studied for its anti-inflammatory, antioxidant, immunomodulatory and antimicrobial properties, as well as for its potential protective effects on the liver and its potential antitumor activity.
But Nigella sativa is not just about thymoquinone. In herbal medicine, we also look at the plant as a whole — what we call the totum. Its different natural compounds work together, and this whole is part of what makes each medicinal plant unique.
1. Supporting immune regulation
Hashimoto’s is an autoimmune condition. Our immune system reacts against components of our own thyroid gland, which is why we often find antibodies such as anti-TPO and anti-thyroglobulin antibodies.
When we live with an autoimmune condition, the goal is not to “boost” the immune system. What we want is better immune regulation. Nigella sativa, and especially thymoquinone, has been studied for its immunomodulatory properties. This is one of the main reasons I became interested in this plant for Hashimoto’s.
2. Anti-inflammatory properties
Hashimoto’s is a thyroiditis — and “-itis” means inflammation. In our case, inflammation of the thyroid gland.
So the anti-inflammatory properties of Nigella sativa and thymoquinone are naturally worth looking at when we live with Hashimoto’s.
3. Antioxidant properties
Nigella sativa also has antioxidant properties.
Oxidative stress happens when our antioxidant defenses can no longer properly balance the production of oxidizing molecules. This matters for thyroid health because the thyroid itself uses oxidative reactions to produce thyroid hormones.
4. What did the Hashimoto’s study find?
This is probably the part I find most interesting.
In one study, people with Hashimoto’s took Nigella sativa for eight weeks. Their average TSH decreased from around 6.4 to 4.1 mIU/L, while T3 increased. Anti-TPO antibodies also decreased, and researchers observed improvements in antioxidant defense and a reduction in a marker of oxidative stress.
The Hashimoto’s study at a glance
Duration: 8 weeks
Form: powdered Nigella sativa seeds
Amount: 2 g per day
Results: ↓ TSH · ↓ anti-TPO · ↑ T3
Important: participants continued taking their usual stable dose of levothyroxine.
Nigella sativa was therefore used alongside thyroid medication, not as a replacement for it.
The study was relatively small, but I find the results interesting because they were observed directly in people with Hashimoto’s — something we do not have for every plant used in natural health.
5. Antibacterial properties and H. pylori
Nigella sativa also has antibacterial properties.
When I look at Hashimoto’s, I do not focus only on the thyroid. Digestive health and factors that may contribute to inflammation or immune activation matter too.
One of them is Helicobacter pylori, or H. pylori, a bacterium that can infect the stomach. A possible connection between H. pylori infection and autoimmune thyroid conditions has been explored.
Nigella sativa has also been studied in people with H. pylori infection, alongside conventional medical treatment.
6. Potential protective effects on the liver
Nigella sativa and thymoquinone may also have protective effects on the liver.
The liver matters for Hashimoto’s because it plays an important role in thyroid hormone metabolism. Part of the conversion of T4 into T3 — the more active form of thyroid hormone — takes place there.
How can you take Nigella sativa?
Nigella sativa can be taken in different forms. The three main ones are seeds, oil and capsules.
The seeds
This is the form used in the Hashimoto’s study: 2 g of powdered Nigella sativa seeds per day for eight weeks, divided into two doses.
The seeds have quite a strong taste — slightly bitter and spicy. You can grind them and mix them with a small amount of honey, add them to yogurt or applesauce, or sprinkle them over food.
Whole seeds can also be used in cooking, particularly on bread or baked goods — gluten-free if possible — or on savory dishes, as they traditionally are in several Middle Eastern and Asian cuisines.
If you want to stay as close as possible to what was studied in people with Hashimoto’s, powdered seeds currently have the most directly relevant evidence.
Black seed oil
Black seed oil has a strong, spicy and slightly bitter taste, which is not for everyone.
You can use it cold in salad dressings or add it to food, either on its own or mixed with a little olive oil to soften the flavor.
I recommend choosing a high-quality organic Nigella sativa oil that is cold-pressed and properly protected from light.
Capsules
Personally, capsules are my favorite form.
The dosage is precise, there is no strong black seed oil taste, they are easy to take every day and you can take them anywhere with you, especially when traveling or on the go.
In fact, I am currently working on developing my own organic Nigella sativa capsules for Hashimoto Natural Support.
My goal is to offer high-quality organic Nigella sativa with an appropriate dosage, while also paying attention to something we do not always think about: the ingredients used to make the capsule itself.
I want to carefully select both the Nigella sativa and the ingredients used in the capsule, with the needs and concerns of my clients living with Hashimoto’s in mind.
It is exactly the kind of supplement I would want to find and use myself.
Stay tuned… I’ll be sharing more soon.
A few precautions
Nigella sativa is natural, but that does not mean it is suitable for everyone.
Avoid Nigella sativa supplements during pregnancy.
If you take anticoagulant medication, speak with your doctor before using a supplement.
If you are having surgery, let your doctor know that you are taking it because of its potential effects on blood clotting.
A final word
Nigella sativa is not a miracle plant — no plant is.
But with its different properties and the research we already have in people with Hashimoto’s, I believe it is a plant worth knowing about.
It is one of the natural tools I have chosen to include in my own approach to living better with Hashimoto’s, naturally.
Important note
This article is for informational and educational purposes only and does not replace medical diagnosis, treatment or follow-up care. The results discussed from scientific studies do not guarantee individual results, as everyone can respond differently to Nigella sativa. If you have a medical condition, take medication, are pregnant or have any concerns, speak with your doctor before using a dietary supplement.
Scientific references
Farhangi MA, Dehghan P, Tajmiri S, Mesgari Abbasi M. The effects of Nigella sativa on thyroid function, serum VEGF-1, Nesfatin-1 and anthropometric features in patients with Hashimoto’s thyroiditis: a randomized controlled trial. BMC Complementary and Alternative Medicine, 2016.
Farhangi MA, Tajmiri S. The effects of powdered black cumin seeds on markers of oxidative stress, intracellular adhesion molecule (ICAM)-1 and vascular cell adhesion molecule (VCAM)-1 in patients with Hashimoto’s thyroiditis. Clinical Nutrition ESPEN, 2020.
Salem EM et al. Comparative study of Nigella sativa and triple therapy in eradication of Helicobacter pylori in patients with non-ulcer dyspepsia. Saudi Journal of Gastroenterology, 2010.
Hejazi N et al. Nigella sativa powder for Helicobacter pylori infected patients: a randomized, double-blinded, placebo-controlled clinical trial. 2023.
Majdalawieh AF, Fayyad MW. Immunomodulatory and anti-inflammatory action of Nigella sativa and thymoquinone: A comprehensive review. International Immunopharmacology, 2015.
Tabassum H, Ahmad A, Ahmad IZ. Nigella sativa L. and Its Bioactive Constituents as Hepatoprotectant: A Review. Current Pharmaceutical Biotechnology, 2018.
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