Hormonal/Heart/Weight

Black seed oil

Oil from Nigella sativa seeds that may modestly improve glucose, lipids, and weight in adults with metabolic risk.

Black seed oil

Oil from Nigella sativa seeds that may modestly improve glucose, lipids, and weight in adults with metabolic risk.

score

evidence

Caution

risk

Proven Benefits

01Improves fasting glucose/HbA1c

02Improves LDL/triglycerides

03Aids modest weight loss

04May lower blood pressure

05May improve insulin resistance

06May reduce waist circumference

Chemical Forms

Recommended

Cold-pressed black seed oil
Standardized Nigella sativa oil
Black seed oil softgels

Avoid

Black seed essential oil (too concentrated, not equivalent to supplement oil)
Unlabeled 'black cumin' blends diluted with carrier oils
Heavily refined or deodorized oils (may reduce active compounds)

Expert Note

Most human trials use cold-pressed black seed oil or standardized Nigella sativa oil, not essential oil. Products that disclose thymoquinone content and are protected from light and air are more consistent. Diluted or heavily refined oils can vary widely in active compounds.

Protocol

Amount

1-2 g

Frequency

Once daily or split into 2 doses

When

With meals to improve tolerance; consistency matters more than timing.

Condition-Based Dosing

Adults with normal fasting glucose and lipids

1 g daily with meals.— Start low for the first week to assess GI tolerance.

Adults with prediabetes or borderline LDL/TG

1-2 g daily, usually split morning and evening for 8-12 weeks.— Most positive trials use daily intake for at least 2 months before reassessment.

Safety & Limits

Upper Safe Limit

No official UL; safety data are limited above ~5 g/day long term (upper end of common trial dosing).

Cycling

Safe for continuous use

Contraindications

Pregnancy — insufficient safety data for supplemental doses; culinary use is different

Anticoagulants or antiplatelet drugs — possible additive bleeding risk

Diabetes medications or insulin — may further lower blood glucose

Antihypertensives — may further lower blood pressure

Scheduled surgery — stop 1-2 weeks prior because of possible bleeding and glucose/BP effects

Known allergy to Nigella sativa or seed oils — may trigger rash or GI symptoms

Synergies

Omega-3

Omega-3 and black seed oil act through partly different lipid and inflammatory pathways, so the pairing may give more complete triglyceride and cardiometabolic support.

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