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Head-to-head evidence comparison — which supplement is right for you?
Aged Garlic Extract vs Black Seed Oil: they're closely matched on evidence (7.5 vs 6.5/10); they're alternatives for support heart health — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Aged Garlic Extract and Black Seed Oil are closely matched across evidence, studies, and safety.
Verdict
Likely helps
9 of 10 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
10 of 11 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Aged Garlic Extract and Black Seed Oil have evidence — compare verdict strength side-by-side.
600-960mg aged garlic extract — range pending qualified review, and not scoped to a formulation, population, duration or outcome
With meals, Split into 2 doses
Kyolic Aged Garlic Extract (most studied)
1-3g oil (or 200-400mg thymoquinone) (a typical label dose, the cited trials do not state a fixed daily dose)
With meals
Cold-pressed oil softgels
8-12 weeks
12+ weeks
4-8 weeks
4-8 weeks
4-8 weeks
8-12 weeks
Effect of garlic extract on markers of lipid metabolism and inflammation in coronary artery disease (CAD) patients: A systematic review and meta-analysis
Phytotherapy research : PTR (2023) · Meta analysis
The standardized mean difference with 95% CI was calculated using fixed-effect or random-effect models.
A meta-analysis of randomized, double-blind, placebo-controlled trials for the effects of garlic on serum lipid profiles
Journal of the science of food and agriculture (2012) · Meta analysis
Meta-analysis of 26 randomised, double-blind, placebo-controlled trials of garlic and serum lipids.
A randomized factorial study of the effects of long-term garlic and micronutrient supplementation and of 2-wk antibiotic treatment for Helicobacter pylori infection on serum cholesterol and lipoproteins
The American journal of clinical nutrition (2006) · Rct · n=408
Randomised, double-blind, placebo-controlled factorial trial in 3,411 adults in Linqu County, China, with lipids measured at 3.3 and 7.3 years in 408 of them (34 randomly selected from each of 12 treatment groups).
Does Nigella sativa supplementation improve cardiovascular disease risk factors? A comprehensive GRADE-assessed systematic review and dose-response meta-analysis of 82 randomized controlled trials
Pharmacological research (2025) · Meta analysis · n=5026
GRADE-assessed meta-analysis of 82 studies (79 quantitative) in 5,026 participants, with Nigella sativa doses from 200 to 4,600 mg a day for 1 to 48 weeks.
A systematic review on anti-diabetic plant essential oil compounds: Dietary sources, effects, molecular mechanisms, and safety
Critical reviews in food science and nutrition (2024) · Systematic review
They can also significantly inhibit the generation of TBARS and MDA, reduce oxidative stress, increase insulin levels, adiponectin, and glycoprotein enzymes, boost antioxidant enzymes like SOD, CAT, and GPx, as well as reduce glutathione and vital glycolytic enzymes.
Effect of Nigella sativa Intake on Oxidative Stress and Inflammation in Patients with Metabolic Syndrome and Related Disorders: A Systematic Review and Meta-analysis of Randomized Controlled Trials
Current pharmaceutical biotechnology (2024) · Meta analysis · n=1033
Meta-analysis of 16 RCTs in 1,033 people with metabolic syndrome and related disorders.
Built from two randomised placebo-controlled trials of aged garlic extract taken on top of blood-pressure medication by people whose hypertension was not controlled. Ried 2013 (PMID 23169470), a dose-response trial in 79 general practice patients over 12 weeks, gave 240, 480 or 960 mg a day: 240 mg did not lower systolic pressure compared with placebo, 480 mg lowered it by 11.8 mmHg (P=0.006), and 960 mg reached a borderline 7.4 mmHg at 8 weeks (P=0.07). Ried 2010 (PMID 20594781), in 50 patients over 12 weeks, found 960 mg a day lowered systolic pressure by 10.2 mmHg (p=0.03) in those starting at 140 mmHg or above, with no significant change in those below 140. The 960 mg point sits no higher than 480 mg because the one trial that compared doses found no extra benefit at the higher dose. 480 mg is the lowest dose with a significant fall. No optimal dose is set, because that trial's arms were small and 960 mg lowered pressure in the second trial, and no ceiling is set on this curve. A 2024 meta-analysis that reported a benefit only above the doses these trials tested has been retracted (PMID 39437887), and no point on this curve rests on it. Aged black garlic extracts dosed by their S-allyl cysteine content (PMID 35276764, 37686723) are a different preparation and are not placed on this axis, and neither is a 2,400 mg trial whose blood pressure result was a secondary before-and-after change in the garlic group (PMID 32349742).
AI-estimated from published studies. Interpret as directional guidance.
Both Aged Garlic Extract and Black Seed Oil are closely matched — the best choice depends on your specific health goals.
For support heart health, Aged Garlic Extract has a higher relevance score (78 vs 50).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.