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Head-to-head evidence comparison — which supplement is right for you?
CBD vs Magnesium: Magnesium has the stronger overall evidence (8.5 vs 5.8/10); they're alternatives for reduce anxiety & stress — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Magnesium wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Mixed evidence
2 of 6 studies with measurable effects showed benefit.
Top outcomes
OTC wellness: 10-50mg/day (some anxiety studies used higher acute doses ~300mg); take with a fat-containing meal (increases absorption several-fold). Prescription Epidiolex for epilepsy is dosed by body weight under medical supervision. (the 10-50mg figure is a typical label dose, the cited trials used 150 mg nightly, or 10 to 20 mg per kg a day of prescription cannabidiol for epilepsy)
With meals, Evening
CBD oil/tincture (third-party tested for potency and purity)
200-250mg elemental magnesium daily
Evening for sleep/relaxation (glycinate), Morning for energy (malate), Anytime (citrate)
Depends on goal - see notes
and 2 more not shown
and 4 more not shown
Acute-4 weeks
1-8 weeks
Weeks
Acute
1-2 weeks
1-2 weeks
1 week
Immediate
Trial of Cannabidiol for Drug-Resistant Seizures in the Dravet Syndrome.
The New England journal of medicine (2017) · Rct · n=120
Convulsive seizures fell from 12.4 to 5.9/month with CBD vs 14.9 to 14.1 with placebo
Cannabidiol in patients with seizures associated with Lennox-Gastaut syndrome (GWPCARE4): a randomised, double-blind, placebo-controlled phase 3 trial.
Lancet (London, England) (2018) · Rct · n=171
Significant reduction in drop-seizure frequency vs placebo
Effect of Cannabidiol on Drop Seizures in the Lennox-Gastaut Syndrome.
The New England journal of medicine (2018) · Rct · n=225
Fewer drop seizures vs placebo
Magnesium supplementation in pregnancy
The Cochrane database of systematic reviews (2014) · Meta analysis · n=9090
Ten trials involving 9090 women and their babies. Only two were judged to be of high quality overall.
Magnesium Supplementation and Blood Pressure: A Systematic Review and Meta-Analysis
Hypertension (2025) · Meta analysis · n=2709
38 RCTs with 2709 participants, median 365 mg elemental magnesium for a median 12 weeks. Systolic BP -2.81 mmHg (95% CI -4.32 to -1.29), diastolic -2.05 mmHg versus placebo.
Magnesium and Potassium Supplementation for Systolic Blood Pressure Reduction in the General Normotensive Population: A Systematic Review and Subgroup Meta-Analysis for Optimal Dosage and Treatment Length
Nutrients (2024) · Meta analysis
Both supplements demonstrated greater reductions in SBP for the general population at lower dosages and longer treatment durations.
Magnesium has a higher evidence score (8.5/10 vs 5.8/10) and wins in 2 of 3 categories.
For reduce anxiety & stress, Magnesium has a higher relevance score (85 vs 58).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
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The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.