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Head-to-head evidence comparison — which supplement is right for you?
Black Seed Oil and Vitamin C are closely matched across evidence, studies, and safety.
Verdict
Likely helps
11 of 12 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
12 of 17 studies with measurable effects showed benefit.
Top outcomes
1-3g oil (or 200-400mg thymoquinone)
With meals
Cold-pressed oil softgels
500-1000mg
With meals, Split doses if taking >500mg
Ascorbic acid or buffered vitamin C
4-8 weeks
4-8 weeks
8-12 weeks
Ongoing
1-2 weeks
4-8 weeks
With high doses (>2g)
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
Our findings suggest that N. sativa could be a promising adjunct therapy for improving cardiovascular disease (CVD) risk factors.
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
In addition, SOD: (SMD: 1.35; (95% CI, from 0.77 to 1.93); P = 0.00) and TAC (SMD: 2.82; (95% CI, from 0.55 to 5.084); P = 0.01) levels significantly increased in the intervention group compared to the placebo group.
Vitamin C supplementation for prevention and treatment of pneumonia
The Cochrane database of systematic reviews (2020) · Meta analysis · n=2774
We are uncertain of the effect of vitamin C supplementation on mortality due to pneumonia (RR 0.21, 95% CI 0.03 to 1.66; 1 study, 57 participants; very low-quality evidence).
Vitamin C supplementation in pregnancy
The Cochrane database of systematic reviews (2015) · Meta analysis · n=20038
Conversely, the risk of term PROM was increased when supplementation included vitamin C and vitamin E (average RR 1.73, 95% CI 1.34 to 2.23; 3060 participants; two studies; I² = 0%).
Enhanced Vitamin C Delivery: A Systematic Literature Review Assessing the Efficacy and Safety of Alternative Supplement Forms in Healthy Adults
Nutrients (2025) · Systematic review
Most studies (77%) had a low risk of bias.
Based on meta-analysis of 1086 participants showing significant reductions in CRP and TNF-α, but no effect on IL-6. High heterogeneity between studies limits confidence.
Based on 3 meta-analyses of sepsis patients. One study showed RR 0.60 for mortality reduction, but another showed increased risk (RR 1.21). Evidence quality rated as low to very low. Effect limited to intravenous administration in critically ill patients.
AI-estimated from published studies. Interpret as directional guidance.
Both Black Seed Oil and Vitamin C are closely matched — the best choice depends on your specific health goals.
For support immune system, Vitamin C has a higher relevance score (85 vs 75).
No known interactions between Black Seed Oil and Vitamin C have been documented in our database. However, always consult a healthcare provider before combining supplements.