Black Seed Oil Benefits for Women: What Studies Show

What are the black seed oil benefits for women? Most of the human research on black seed oil (Nigella sativa) in women looks at body weight and body composition, blood lipids, and markers measured around menopause. Several of these trials enrolled only women, which makes them more relevant than the usual mixed-sex studies. They were also small and short, and reviewers rate much of the wider black seed evidence as low or very low quality.^[1]

This guide walks through what each study measured, where the research is still limited to animals, and what women should know about safety, including pregnancy. If you prefer a simple daily format, our cold-pressed black seed oil softgels provide 1,000 mg of oil per softgel, standardized to 2% thymoquinone. For the bigger picture, start with our main guide to black seed oil benefits.

Why women are interested in black seed oil

Black seed oil is pressed from the seeds of Nigella sativa, a flowering plant grown from the Mediterranean to South Asia, with a long history as a food. Researchers today mostly study it for lipids and body measurements.

Women usually ask about four things: weight and body composition, cholesterol around menopause, hair and skin routines, and safety during pregnancy and breastfeeding. The evidence differs a lot between them, so we'll take each in turn.

Black seed oil and weight management in women

Black seed oil with a low-calorie diet

In a double-blind trial in Iran, 90 women with a BMI of 30 to 35 followed a low-calorie diet and took either 3 g of black seed oil a day (1 g before each meal) or a placebo for 8 weeks. Of these, 84 women completed the study.^[2] Compared with placebo, the black seed oil group had:

• A larger drop in body weight: −6.0% compared with −3.6%
• A larger drop in waist circumference: −6.9% compared with −3.4%
• Lower triglycerides: −14.0% compared with a 1.4% rise in the placebo group

Everyone was dieting, so the oil was tested as an add-on to calorie control, not a replacement for it.

Body fat and appetite

A crossover trial gave 45 healthy women with overweight or obesity 2,000 mg of black seed oil a day or a placebo, in two 8-week periods separated by a 4-week washout. The authors reported lower body fat mass, body fat percentage and visceral fat area, along with lower appetite, during the black seed oil period.^[3] The abstract's weight and waist results are unclear, so we don't rely on them.

What the pooled data say

A 2018 meta-analysis pooled 11 placebo-controlled trials in men and women. Black seed was linked to an average drop of 2.11 kg in body weight, 1.16 kg/m² in BMI and 3.52 cm in waist circumference. The authors noted high variation between studies and few high-quality trials, and no serious side effects.^[4]

Black seed oil can be one part of a routine that supports healthy weight management, together with balanced eating and regular activity.*

Black seed oil and cholesterol around menopause

Two Malaysian studies looked specifically at women in midlife. Both used powdered seed in capsules, not oil, so the results may not carry over directly to oil supplements.

A 2-month lipid study in menopausal women

In a randomized, placebo-controlled trial, menopausal women with high blood lipids took Nigella sativa seed powder (19 women) or a placebo (18 women) for 2 months. The black seed group had better lipid results than the placebo group, with lower total cholesterol, LDL cholesterol and triglycerides, and higher HDL cholesterol.^[5] One month after stopping, the levels drifted back toward where they started.

Women in the menopause transition

A crossover study enrolled 69 women aged 45 to 65. They took 1,600 mg a day of powdered black seed or a placebo for 12 weeks each, with a 14-day break in between.^[6] The researchers reported:

• Significant improvements in LDL cholesterol and blood glucose compared with placebo
• No significant differences in total cholesterol, HDL cholesterol or triglycerides
• Fewer and milder menopausal symptoms, plus gains in some quality-of-life measures

Both studies were small, and the second was open-label (participants knew what they were taking). These are early findings.

Black seed oil may help maintain cholesterol levels that are already within the normal range.*

Black seed oil for hair, skin and nails

Many women apply black seed oil to the skin and scalp or take it in beauty supplements. Human research here is thin, and none of the trials above measured hair, skin or nail outcomes.

Applying it to the skin

Black seed oil can cause allergic contact dermatitis in some people.^[9] Researchers in France described five new cases of allergy to the oil in a single report.^[12] If you want to try it on your skin, do a patch test first: apply a small amount to the inner forearm and wait 48 hours before using it on your face.

Taking it with biotin and other nutrients

Hair, skin and nail supplements often pair black seed oil with biotin. The NIH Office of Dietary Supplements notes that claims for biotin and hair, skin and nails are supported, at best, by only a few case reports and small studies.^[13] Adults need about 30 mcg of biotin a day.^[13]

Summary of the studies in women

Study	Who took part	Amount and duration	What was measured	Main result
Mahdavi 2015[2]	84 women, BMI 30–35, on a low-calorie diet	3 g oil daily, 8 weeks	Weight, waist, lipids	Larger drops in weight, waist and triglycerides than placebo
Safi 2021[3]	45 women with overweight or obesity	2,000 mg oil daily, two 8-week periods	Appetite, body composition	Lower body fat, visceral fat and appetite reported
Ibrahim 2014[5]	37 menopausal women with high lipids	Seed powder, 2 months	Blood lipids	Better lipid profile than placebo. Levels drifted back after stopping.
Latiff 2014[6]	69 women aged 45–65	1,600 mg seed powder daily, 12 weeks	Lipids, glucose, menopausal symptoms	Lower LDL and glucose. No change in total cholesterol, HDL or triglycerides.
Namazi 2018[4]	11 trials, men and women	Varied	Weight, BMI, waist	−2.11 kg, −1.16 kg/m², −3.52 cm compared with placebo

How women can take black seed oil

The women's trials above used 1.6 to 3 g a day for 8 to 12 weeks. Across reviewed trials in all adults, doses ranged from 0.5 to 6 g of seed or 2.5 to 5 mL of oil a day.^[1] A practical approach:

1. Choose a format that fits your day. Softgels are unflavored and easy to carry. Gummies are chewable and combine black seed oil with vitamins and minerals.
2. Follow the label serving. Don't increase it to match study doses on your own.
3. Take it with a meal. Digestive complaints are the side effect reported most often in trials.^[1]
4. Stay consistent for 8 to 12 weeks. That matches the length of most studies in women.

Our guide on how to take black seed oil covers timing and food pairings in more detail.

How Orzax black seed oil products fit

Orzax offers two black seed oil formats for different routines: a plain softgel and a chewable gummy with added nutrients.

• Black Seed Oil Softgels 1000 mg: cold-pressed, 1,000 mg of black seed oil per softgel, standardized to 2% thymoquinone, unflavored. The label serving is 1 softgel daily. The shell is bovine gelatin, so this product isn't vegan.
• Black Seed Oil Hair, Skin & Nail Gummies: each 2-gummy serving lists 500 mg black seed (Nigella sativa) oil, 5 mg biotin, 4 mg zinc (as zinc citrate), 50 mg vitamin C, 6 mg vitamin E, 3.82 mg pantothenic acid, 1.4 mg vitamin B6 and 200 mcg RAE vitamin A. The gummies are pectin-based and sweetened with stevia. Directions are to chew two gummies daily, preferably with a meal. Each bottle holds 60 gummies (30 servings).

As part of a balanced diet and active lifestyle, black seed oil supports normal cardiovascular function and the body's natural antioxidant defenses.*

Safety: what women should know first

In clinical trials, side effects were generally mild. The most common were digestive complaints, and no serious adverse events were reported.^[1] Some situations still call for a conversation with your clinician first.

Pregnancy and breastfeeding

• Pregnancy. There are no good human safety data, and the animal research gives reason for caution. In rats, a seed extract given at 2 g/kg a day after mating had a contraceptive effect.^[7] In laboratory tests on isolated uterine tissue from rats and guinea pigs, the volatile oil reduced muscle contractions.^[8] These findings don't establish effects in people, but they are a reason to avoid it while pregnant or trying to conceive unless your clinician advises otherwise.
• Breastfeeding. There are no data on whether black seed passes into breast milk or how it affects infants.^[9] Ask your clinician before using it while nursing.

Medications, kidneys and lab tests

• Prescription medications. In a small study of 4 healthy volunteers, black seed taken at 2.5 g twice daily for 7 days reduced the activity of liver enzymes (CYP2D6 and CYP3A4) that process many drugs.^[10] Check with your clinician or pharmacist.
• Cholesterol, blood sugar or blood pressure medication. Black seed has been studied for its effects on these markers, so your clinician should know if you take it alongside these drugs.^[4][6]
• Kidney concerns. A published case report described acute kidney failure associated with Nigella sativa in a patient with diabetes.^[11] A case report doesn't prove cause, but it's a reason for caution.
• Upcoming blood work. Biotin can interfere with some lab tests. Even a single 10 mg dose has affected thyroid tests.^[13] Tell your clinician and lab about any biotin you take, including the 5 mg in hair, skin and nail gummies.

For a full rundown, read our guide to black seed oil side effects.

Frequently Asked Questions

What does black seed oil do for women?

In women-only trials, researchers have mostly measured weight, waist size, body fat and blood lipids, with some favorable results over 8 to 12 weeks.^[2][3][5][6] It may help support normal cardiovascular function as part of a healthy lifestyle.*

Can black seed oil help women lose weight?

In one 8-week trial, women on a low-calorie diet who took 3 g of black seed oil a day lost 6.0% of their body weight, compared with 3.6% in the placebo group.^[2] It can be part of a routine that supports healthy weight management.*

Is black seed oil good for women during menopause?

Two small studies in women around menopause found favorable changes in some lipid markers, and one also reported fewer menopausal symptoms.^[5][6] Both used seed powder, not oil, so talk with your clinician about whether it suits you.

Can I take black seed oil while pregnant?

It's best to avoid black seed oil supplements during pregnancy unless your clinician advises otherwise. There are no reliable human safety data, and animal research raises questions.^[7][8]

How much black seed oil should a woman take daily?

Follow the label serving on your product. Women's trials used 1.6 to 3 g a day,^[2][6] but research doses aren't a recommendation. Talk with your clinician before taking more than the label amount.

References

1. Li Z, Wang Y, Xu Q, Ma J, Li X, Yan J, Tian Y, Wen Y, Chen T. Nigella sativa and health outcomes: an overview of systematic reviews and meta-analyses. Front Nutr. 2023;10:1107750. PubMed
2. Mahdavi R, Namazi N, Alizadeh M, Farajnia S. Effects of Nigella sativa oil with a low-calorie diet on cardiometabolic risk factors in obese women: a randomized controlled clinical trial. Food Funct. 2015;6(6):2041-2048. PubMed
3. Safi S, Razmpoosh E, Fallahzadeh H, Mazaheri M, Abdollahi N, Nazari M, Nadjarzadeh A, Salehi-Abargouei A. The effect of Nigella sativa on appetite, anthropometric and body composition indices among overweight and obese women: a crossover, double-blind, placebo-controlled, randomized clinical trial. Complement Ther Med. 2021;57:102653. PubMed
4. Namazi N, Larijani B, Ayati MH, Abdollahi M. The effects of Nigella sativa L. on obesity: a systematic review and meta-analysis. J Ethnopharmacol. 2018;219:173-181. PubMed
5. Ibrahim RM, Hamdan NS, Mahmud R, Imam MU, Saini SM, Rashid SN, Abd Ghafar SA, Latiff LA, Ismail M. A randomised controlled trial on hypolipidemic effects of Nigella Sativa seeds powder in menopausal women. J Transl Med. 2014;12:82. PubMed
6. Latiff LA, Parhizkar S, Dollah MA, Hassan ST. Alternative supplement for enhancement of reproductive health and metabolic profile among perimenopausal women: a novel role of Nigella sativa. Iran J Basic Med Sci. 2014;17(12):980-985. PubMed
7. Keshri G, Singh MM, Lakshmi V, Kamboj VP. Post-coital contraceptive efficacy of the seeds of Nigella sativa in rats. Indian J Physiol Pharmacol. 1995;39(1):59-62. PubMed
8. Aqel M, Shaheen R. Effects of the volatile oil of Nigella sativa seeds on the uterine smooth muscle of rat and guinea pig. J Ethnopharmacol. 1996;52(1):23-26. PubMed
9. Drugs and Lactation Database (LactMed). Black seed. Bethesda (MD): National Institute of Child Health and Human Development. PubMed
10. Al-Jenoobi FI, Al-Thukair AA, Abbas FA, Ansari MJ, Alkharfy KM, Al-Mohizea AM, Al-Suwayeh SA, Jamil S. Effect of black seed on dextromethorphan O- and N-demethylation in human liver microsomes and healthy human subjects. Drug Metab Lett. 2010;4(1):51-55. PubMed
11. Arslan E, Sayin S, Demirbas S, Cakar M, Somak NG, Yesilkaya S, Saglam K. A case study report of acute renal failure associated with Nigella sativa in a diabetic patient. J Integr Med. 2013;11(1):64-66. PubMed
12. Seiller H, Kurihara F, Chasset F, Soria A, Barbaud A. Tert-butylhydroquinone is a marker for sensitivity to Nigella sativa oil allergy: five new cases. Contact Dermatitis. 2021;84(6):447-449. PubMed
13. National Institutes of Health, Office of Dietary Supplements. Biotin: Fact Sheet for Health Professionals. NIH ODS

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice. Consult your healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medication, or have a medical condition.