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The 30-second answer
The 2020 review (50 trials) found a fall in total cholesterol of 16.80, LDL cholesterol of 18.45 and triglycerides of 15.73, and the 2024 review (34 trials, 2,278 participants) found the same direction plus a rise in HDL. But in people with diabetes (16 trials) there was no effect on triglycerides or HDL, and the reviews describe it as an “adjuvant” alongside treatment. If you take a cholesterol, diabetes or blood pressure medicine, ask your doctor first.
From heritage: what does “every disease” mean?
In Sahih Muslim (2215) there is a second wording under the same number from Abu Huraira: “There is no disease except that black seed holds a remedy for it, except death”. This is why the seed holds a place in our homes, but it is not proof that it treats cholesterol. An Islamweb fatwa says black seed is a remedy, not an act of worship, and that using it is referred to experienced doctors. So what did modern research find on cholesterol?
What did the reviews find?
| Review | Who and how many | Result |
|---|---|---|
| Hallajzadeh 2020 | 50 randomised trials | Total cholesterol fell 16.80 (12.55 to 21.04), LDL 18.45 (14.94 to 22.44), triglycerides 15.73 (10.69 to 20.77) and VLDL 3.72 (0.18 to 7.27) |
| Rounagh 2024 | 34 trials, 2,278 adult participants | On the SMD scale: total fell 1.78, triglycerides 1.27 and LDL 2.45, and HDL rose 0.79 (0.38 to 1.20) |
| Karimi 2025 | 16 trials in type 2 diabetes | Total fell 18.80 mg/dL (p=0.04) and LDL 19.53 mg/dL (p=0.003); no effect on triglycerides or HDL |
| Jafari 2025 | 82 studies, 5,026 participants, doses of 200 to 4,600 mg/day for 1 to 48 weeks | The abstract lists improvement in TC, TG, LDL, HDL and VLDL without pooled numbers |
- Same direction: two large reviews (50 and 34 trials) found a fall in total cholesterol, LDL and triglycerides.
- Units: the 2020 review did not state the unit in the abstract, and the 2024 review used SMD rather than mg/dL, so we do not convert the numbers to mg/dL.
- People with diabetes: the analysis dedicated to them (2025) found a fall in total and LDL but no effect on triglycerides or HDL.
- Dose and form: the 2025 review found LDL was better with doses above 1 g/day and with the oil form, and our capsule is exactly 1 g of oil, not more.
Important caveats
- Lab values, not events: the abstracts report lab numbers, and do not say anyone had fewer heart attacks or strokes.
- Not identical: triglycerides fell in two reviews and did not change in people with diabetes, so results differ by who is studied.
- An add-on: the 2024 review said black seed “may be suggested as an adjuvant anti-hyperlipidemic agent”, meaning an add-on, not a replacement.
- Duration and dose: trials ran from 1 to 48 weeks at 200 to 4,600 mg/day, so we do not quote a result for one capsule.
- No substitute for medicine: we do not compare this fall with cholesterol medicines, because we did not open a source that does.
- Details: the dose is in black seed oil capsules: dose and timing, and blood sugar in black seed and blood sugar.
Who should ask a doctor first?
- People on cholesterol or lipid medicines: black seed lowered fats in the trials, and we did not open a source on interactions with these medicines, so ask your doctor and monitor your labs.
- People on diabetes or blood pressure medicines: sugar and pressure may fall further, so keep monitoring.
- People on blood thinners such as warfarin: a lab study predicted an interaction above 1 g of oil a day.
- People with kidney or liver disease: rare cases were reported after black seed oil.
- Pregnancy, breastfeeding and children, before any surgery, and anyone allergic to black seed or gelatin.
Our capsule
#1
1000 mg oilCold-pressed
Avantic Activated Black Seed – 30 Capsules
Virgin black seed oil, one capsule a day
EGP 240
30 capsules · one a day · current price from the product page
- The pack: 1000 mg black seed oil per capsule, one capsule per serving, 30 servings
- The page: cold-pressed virgin oil, made in Egypt and registered with the NFSA under 2024/11149
- The pack: bovine gelatin capsule, only 10 kcal
Heads-up: The thymoquinone percentage is not on the pack, so we will not quote one; the capsule shell is bovine gelatin
Safety details are in black seed side effects: who should avoid it. Trials measured after 8 weeks or more, so if you start, keep to one capsule a day for 2 to 3 months, then repeat your labs with your doctor.
Want to ask?
Beseha pharmacists answer on WhatsApp. Tap the “Ask a pharmacist” button and tell them your cholesterol or diabetes medicines before you start.
FAQ
Does black seed lower cholesterol?
The 2020 review (50 trials) found lower total cholesterol, LDL and triglycerides, and the 2024 review (34 trials) found the same direction with higher HDL, but these are lab measurements, not a treatment.
Does it lower triglycerides?
Yes in two general reviews, but the analysis in type 2 diabetes (16 trials) found no effect on triglycerides.
Does it replace a cholesterol medicine?
No; the 2024 review described black seed as a possible adjuvant, and do not change your medicine dose yourself.
How long until results show?
Trials ran from 1 to 48 weeks, and in the diabetes analysis the fasting glucose effect appeared after more than 8 weeks, so repeat your labs after two to three months with your doctor.
Is your capsule the same dose as the studies?
The capsule is 1000 mg of oil and the studies used 200 to 4,600 mg a day, so we do not quote a result for one capsule.
Who should ask a doctor first?
Anyone taking cholesterol, diabetes, blood pressure or blood-thinning medicines, people with kidney or liver disease, and pregnant or breastfeeding women and children.
Read next: Black seed: what 82 clinical studies show and black seed and blood sugar and black seed and blood pressure.
The bottom line
Two large reviews found lower total cholesterol, LDL and triglycerides with black seed, but the result differed in people with diabetes, and the numbers are lab values, not heart events. It is an add-on, not a substitute for medicine, and if you take cholesterol, diabetes or blood pressure medicines ask your doctor before you start.
Activated Black Seed at Beseha →
Sources
- Hallajzadeh et al. 2020: Nigella sativa, glycemic control and lipid profiles, meta-analysis
- Rounagh et al. 2024: Nigella sativa and lipid profiles, updated meta-analysis
- Karimi et al. 2025: black seed in type 2 diabetes, meta-analysis
- Jafari et al. 2025: 82 studies on black seed
- Wang et al. 2022: thymoquinone and warfarin
- Islamweb: fatwa on using black seed as a remedy (Arabic)
This content is for information and is not a substitute for advice from a doctor or pharmacist. Prices and availability may change; the final price is on the product page.
