Nigella Seed
Evidence: GoodUseful mainly for adults seeking modest improvements in blood pressure, blood sugar, or cholesterol markers.
Quick decision guide
May help most
adults seeking modest improvements in blood pressure, blood sugar, or cholesterol markers
Common dosing range
~1-3 g/day ground seed or ~200-500 mg/day standardized oil/extract
When to expect effects
Weeks (typically 8-12)
Watch out for
Effects are biomarker-level and modest; may add to blood-pressure and glucose-lowering drugs
What is it
Nigella seed comes from Nigella sativa, commonly called black cumin or black seed, and its oil and extracts are rich in the active compound thymoquinone. It is a traditional remedy now studied in numerous small randomized trials, mainly for cardiometabolic biomarkers. Effects are generally modest.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Evidence | Effect | Best fit | Time |
|---|---|---|---|---|
| blood pressure reduction | Good Evidence | ~2-4 mmHg | adults with elevated or mildly high blood pressure | Weeks |
| glycemic control | Good Evidence | Modest fasting glucose/HbA1c reduction | adults with type 2 diabetes or impaired glucose regulation | Weeks to months |
| lipid profile improvement | Good Evidence | Modest LDL/triglyceride reduction | adults with elevated cholesterol or triglycerides | Weeks to months |
Evidence for 3 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
blood pressure reduction
Biomarker supportMeta-analyses of randomized trials show Nigella sativa modestly lowers systolic and diastolic blood pressure, on the order of a few mmHg, versus placebo. The change is a blood-pressure biomarker improvement rather than demonstrated reduction in cardiovascular events.
Bottom line: It produces a small but fairly consistent reduction in blood pressure.
glycemic control
Biomarker supportPooled randomized trial data indicate Nigella sativa reduces fasting blood glucose and HbA1c compared with placebo in people with type 2 diabetes or metabolic dysfunction. These are glycemic biomarkers; long-term diabetes outcomes have not been established.
Bottom line: It modestly improves glycemic markers and may be a reasonable adjunct to standard diabetes care.
lipid profile improvement
Biomarker supportMeta-analyses report that Nigella sativa, particularly the seed powder, lowers total and LDL cholesterol and triglycerides versus placebo, with smaller and less consistent effects on HDL. These are lipid biomarker changes and do not by themselves prove reduced cardiovascular risk.
Bottom line: It modestly improves cholesterol and triglyceride markers, especially as seed powder.
Evidence is mixed
Effect sizes vary with preparation (seed powder vs oil) and dose, and HDL effects are inconsistent across trials.
How to take it
- Typical dose
- ~1-3 g/day ground seed or ~200-500 mg/day standardized oil/extract
- Higher studied dose
- Up to ~2-3 g/day seed powder in some trials
- Timing
- With meals
- With food
- With food
- How long to try
- Trial 8-12 weeks
What to track
- Blood pressure
- Fasting glucose or HbA1c
- Lipid panel (LDL, triglycerides)
Safety
Common side effects
mild gastrointestinal upset, nausea
Who should avoid it
- people on tightly controlled blood-pressure or glucose-lowering therapy without monitoring
Pregnancy & breastfeeding
Concentrated extracts are not recommended in pregnancy due to limited safety data and traditional concerns about uterine effects; culinary amounts are likely fine.
Interactions
Additive blood-pressure lowering
Additive glucose lowering; monitor for hypoglycemia
Theoretical additive effect on bleeding risk
Choosing a product
Look for
- Standardized thymoquinone content
- Cold-pressed black seed oil or defined seed powder
- Stated Nigella sativa species and dose
Be skeptical of
- Cures diabetes or hypertension
- Cure-all 'remedy for everything'
- Replaces prescribed medication
References by claim
blood pressure reduction
glycemic control
Track Nigella Seed with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.