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The 30-second answer
The studies in women are small and in forms different from our capsule: a 1000 mg extract in PCOS in 103 adolescents (glucose fell more than in the drug group), seed powder in Hashimoto’s in 40 women (TSH and TPO antibodies fell), and a topical oil for cyclic breast pain in 156 women. On breastfeeding, the LactMed database says no valid trials support more milk and there is no safety data. So it is an add-on after your doctor, not a substitute for thyroid or ovarian treatment.
From heritage: «a remedy for every disease»
In Sahih al-Bukhari (5688): «In the black seed there is a remedy for every disease except al-Sam». An Islamweb fatwa (134283) notes that black seed is a remedy, not an act of worship, that no authentic report specifies the amount or the method, and that experienced doctors are to be consulted. That explains its place in our culture; it is not a promise of a result in PCOS or the thyroid, so what did modern research find?
PCOS, thyroid and breast pain: the trials
| Study | Type and sample | Form and duration | Result |
|---|---|---|---|
| Mahmoudian 2025 | Secondary analysis of a randomised trial: 116 adolescents (12 to 18 years) with PCOS, and 103 completed (50 black seed and 53 control) | Extract 1000 mg a day versus medroxyprogesterone 10 mg for 10 days each cycle, for 16 weeks | Fasting glucose (p = 0.004) and 2-hour post-meal glucose (p = 0.023) fell more in the black seed group than the drug group. The authors: possibly a complementary approach, with more research needed |
| Farhangi 2016 | Randomised trial in 40 patients with Hashimoto’s thyroiditis (22 to 50 years) | Black seed powder daily (the dose is not in the abstract) versus placebo, 8 weeks | Weight, BMI, TSH, TPO antibodies and VEGF fell and T3 rose in the black seed group only |
| Huseini 2016 | Triple-blind randomised trial in 156 women with cyclic breast pain: 52 oil, 51 topical diclofenac and 53 placebo | Oil 600 mg applied twice daily, for 2 months | Less pain than placebo (p under 0.001) and close to topical diclofenac; no adverse effects |
- The forms differ from our capsule: an extract for the ovaries, powder for the thyroid and a topical oil for the breast. Our capsule is an oral oil, so we do not say it reproduces any of them.
- PCOS: the analysis is secondary, against a drug rather than placebo, and in adolescents; it has no result on the cycle or ovulation, because the measure was glucose only.
- Hashimoto’s: 40 women for 8 weeks, and not compared with thyroxine; there is no basis for anyone to stop thyroid treatment.
- Breast pain: the result is for the topical oil, not capsules.
Pregnancy and breastfeeding
The LactMed database (updated July 2025): black seed has been used traditionally to increase milk in India, Türkiye and the Middle East, but no valid clinical trials support this. One study found a slightly greater rise in prolactin than placebo, with no evidence of infant growth. There is no data on the excretion of its components into milk or on its safety in infants, and limited information says it is “generally well tolerated”, while the oil can cause allergic contact dermatitis. LactMed also says galactogogues should not replace evaluation of the factors that affect milk production. So we do not say it increases milk, and pregnant and breastfeeding women ask the doctor first.
The dose, honestly
- Our capsule holds 1000 mg of oil, and the serving is one capsule. The Mahmoudian extract was also 1000 mg a day, but an extract not an oil, and in adolescents with PCOS under medical follow-up.
- The Hashimoto’s powder dose is not in the abstract, and the breast oil is topical: so there is no dose we can state from these studies for the capsule.
- The thymoquinone percentage is not on our label. If you try it, one capsule a day after talking to your doctor, and review your tests with them after two months. Details in black seed oil capsules: dose and timing.
Who should ask a doctor first?
- Pregnant and breastfeeding women: there is not enough data, and no proof it increases milk.
- Women with Hashimoto’s or on thyroxine: do not stop your treatment or add anything without your doctor, and review your tests.
- Women with PCOS on hormonal treatment or diabetes medicines: sugar may fall further, so keep monitoring.
- Adolescents under 18: ask the doctor first.
- People on blood thinners such as warfarin: a lab study predicted an interaction above 1 g of oil a day.
- People on diabetes or blood pressure medicines, and those with kidney or liver disease: rare cases were reported after black seed oil.
- Skin allergy: black seed oil can cause allergic contact dermatitis; if a rash, swelling or wheeze appears, stop and call the doctor.
- An irregular cycle, new breast pain or a change in your weight or tiredness: that needs a diagnosis, not a supplement.
Our capsule
#1
1000 mg oilCold-pressed
Avantic Activated Black Seed – 30 Capsules
Virgin black seed oil, one capsule a day
EGP 240
30 capsules · one a day · current price from the product page
- The pack: 1000 mg black seed oil per capsule, one capsule per serving, 30 servings
- The page: cold-pressed virgin oil, made in Egypt and registered with the NFSA under 2024/11149
- The pack: bovine gelatin capsule, only 10 kcal
Heads-up: The thymoquinone percentage is not on the pack, so we will not quote one; the capsule shell is bovine gelatin
Want to ask?
Beseha pharmacists answer on WhatsApp. Tap the “Ask a pharmacist” button and tell them your medicines before you start.
FAQ
Does black seed help PCOS?
A secondary analysis in 103 adolescents (1000 mg extract, 16 weeks) found fasting and post-meal glucose fell more than in the drug group, but it is not about the cycle or ovulation, in forms other than our capsule, and needs a doctor’s follow-up.
Does it help Hashimoto’s?
A 40-woman trial (powder, 8 weeks) found lower TSH and TPO antibodies and higher T3, but it is small and not a substitute for thyroxine.
Does it increase milk?
No; LactMed says no valid trials support this and there is no safety data for infants, so breastfeeding women ask the doctor.
Does it help cyclic breast pain?
A topical oil 600 mg twice a day did better than placebo and close to topical diclofenac, but it is not capsules.
Is it fine in pregnancy?
There is not enough data; pregnant women ask the doctor first.
How many capsules a day?
There is no dose we can state from these studies for the capsule; its serving is one 1000 mg capsule, and ask your doctor first.
Read next: Black seed: what 82 clinical studies show, black seed and joint pain and black seed side effects: who should avoid it and Herbana for breastfeeding: does it increase milk or weight?.
The bottom line
The studies in women are small and in forms different from our capsule (an extract for the ovaries, powder for the thyroid and topical oil for the breast), and there is no evidence on breastfeeding. So there is no basis to say one capsule a day treats PCOS or the thyroid or increases milk. It is an add-on after your doctor, not a substitute for treatment, and if you are pregnant, breastfeeding or on thyroid or ovarian treatment, ask before you start.
Activated Black Seed at Beseha →
Sources
- Mahmoudian et al. 2025: Nigella sativa and glycaemia in adolescent PCOS
- Farhangi et al. 2016: Nigella sativa and thyroid function in Hashimoto’s thyroiditis
- Huseini et al. 2016: topical Nigella sativa oil for cyclic mastalgia
- LactMed 2025: black seed and breastfeeding
- Wang et al. 2022: thymoquinone and warfarin
- Sener et al. 2024: a case of kidney and liver injury after black seed oil
- Islamweb: fatwa on using black seed as a remedy (Arabic)
This content is for information and is not a substitute for advice from a doctor or pharmacist. Prices and availability may change; the final price is on the product page.
