Black seed (Nigella sativa) and blood pressure

What 2 graded rows on black seed (nigella sativa) agree on for blood pressure, and where they differ. Counted side by side, never averaged.

Consensus finder Rows from the Black seed (Nigella sativa) page, reviewed Oct 21, 2026 How it decides

What the rows agree on

Each block and row is one graded row from the Black seed (Nigella sativa) page, with its PubMed record.

Supplement

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2 rows · 904 people

They agree: both rows found an improvement.

No difference

Improved

Each block is one evidence row, sized by how many people it enrolled, with its grade inside.

From the rows

The best-graded row, grade B, is a meta-analysis of 834 people (2026) and found an improvement.

The rows run from 70 to 834 people, published from 2013 to 2026: 1 pooled review and 1 single study.

2 improved

Grade BBlood pressure in metabolic disease · Improved
Meta-analysis, 13 studies · n 834 · 2026 · Adults with metabolic diseases such as type 2 diabetes or obesity, in 13 trials reporting blood pressure
Not stated in the abstract · Not stated in the abstract
Systolic pressure fell 3.25 mm Hg (95% CI −4.44 to −2.06) and diastolic 2.75 mm Hg (95% CI −4.62 to −0.89) versus control.
Row on the Black seed (Nigella sativa) page · PubMed 41858302 (opens PubMed)
Grade CBlood pressure in healthy adults · Improved
RCT · n 70 · 2013 · Healthy adults aged 34–63 with normal blood pressure
2.5 mL twice daily (5 mL/day) · 8 weeks
Systolic and diastolic pressure fell versus placebo; liver and kidney blood tests did not change and no adverse effects were reported.
Row on the Black seed (Nigella sativa) page · PubMed 23436437 (opens PubMed)