Oral black seed oil / Nigella sativa oil / black cumin seed oil / Nigella seed or extract preparations
The strongest current support is for cholesterol & blood fats. Other uses on this page have narrower, weaker, or not-yet-clear evidence.
What the research says
Each row is a different health effect. A means the support looks strongest, B likely helpful, C mixed or modest, and — not enough human evidence yet.
Papers are individual studies. Research reviews summarize evidence from multiple studies, such as systematic reviews and meta-analyses.
A · Strong evidence of benefit
A
Cholesterol & blood fats
This is the best-supported use on this page. The evidence supports cholesterol & blood fats more clearly than the other uses listed here, but not broader claims.
12 papers · 4 research reviews
B · Likely helpful
B
Blood sugar markers
The research suggests this may help with blood sugar markers in the studied settings. Broader claims would go beyond the evidence shown here.
12 papers · 4 research reviews
C · Mixed or limited evidence
C
Blood pressure
The research on blood pressure is mixed, modest, or both. Any claim here should stay narrow and specific.
12 papers · 4 research reviews
C
Weight & waist
The research on weight & waist is mixed, modest, or both. Any claim here should stay narrow and specific.
12 papers · 5 research reviews
— · Not enough human evidence yet
—
Asthma symptoms
Research has been reviewed for asthma symptoms, but the current human evidence is still too limited or inconsistent for a confident benefit claim.
4 papers · 1 research review
Safety
Safety is graded separately from benefits. Even with a favorable safety label, these notes still matter if you take medication, are pregnant, or have a medical condition.
✓ SafeNo clear harm signal in the human evidence reviewed.
✓
Medication, pregnancy & bleeding cautions
This is a safety note, not a benefit claim. It should not be read as a green light for every person or situation.
6 direct human studies
✓
Side effects and tolerability
This is a safety note, not a benefit claim. It should not be read as a green light for every person or situation.
4 direct human studies
Quick facts
A quick read on what this page supports right now.
Health effects reviewed
5 health effects reviewed
Best grade shown
A · Strong evidence of benefit
Benefits with support
4 uses currently show some level of supportive evidence
Safety rows
2 separate safety or caution rows
Research volume
27 unique research papers across graded uses on this page
What this means
Keep any benefit claims limited to the specific graded uses shown here.
Quality-verified products
Products that pass third-party quality testing.
Product quality data coming soon
Any future product listings should stay aligned with the specific graded outcomes and the separate safety rows shown here.
How we graded Black seed oil / Nigella sativa
This page shows the current public rows for Black seed oil / Nigella sativa:
27 unique research papers across
5 visible health effects. Safety rows are shown separately from benefit rows when available. The page includes
18 review-level papers and
34 direct human studies. Each supplement is graded by health effect using a certainty × effect matrix applied across PubMed evidence per health effect. Cochrane reviews and high-quality systematic reviews carry the most weight. See
Methodology
for full detail.