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Head-to-head evidence comparison — which supplement is right for you?
Magnesium vs SAMe: Magnesium has the stronger overall evidence (8.5 vs 6.5/10); they're alternatives for support mood — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Magnesium wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mixed evidence
2 of 6 studies with measurable effects showed benefit.
Top outcomes
Verdict
Too few graded studies
0 of 1 studies with measurable effects showed benefit.
Top outcomes
200-250mg elemental magnesium daily
Evening for sleep/relaxation (glycinate), Morning for energy (malate), Anytime (citrate)
Depends on goal - see notes
400-1,200 mg for mood, 600-1,200 mg for joints. The cited trials used 1,200 mg for knee osteoarthritis and 200 mg a day with probiotics. Label products for mood go up to 1,600 mg, above the highest dose in the cited trials.
On empty stomach, Morning and/or midday
Enteric-coated tablets (SAMe tosylate or butanedisulfonate)
and 4 more not shown
1-2 weeks
1-2 weeks
1 week
Immediate
2-6 weeks
4-8 weeks
4-8 weeks
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.
S-Adenosylmethionine for osteoarthritis of the knee or hip
The Cochrane database of systematic reviews (2009) · Meta analysis · n=656
Four placebo-controlled trials with 656 patients were included, of poor methodological quality.
Efficacy of Pharmacological Interventions in Milder Depression: A Systematic Review and Meta-Analysis
Neuropsychopharmacology reports (2025) · Meta analysis · n=1049
Eight RCTs comprising 1049 participants met inclusion criteria.
S-Adenosylmethionine (SAMe) for Liver Health: A Systematic Review
Nutrients (2024) · Systematic review
Systematic review of 15 studies of SAMe in liver disease, all rated 4 or 5 out of 5 for quality.
Magnesium has a higher evidence score (8.5/10 vs 6.5/10) and wins in 3 of 3 categories.
For support mood, SAMe has a higher relevance score (90 vs 60).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The honest tier list — proven staples vs situational vs mostly marketing. The hub the other guides feed into.
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Berberine, inositol, magnesium vs the cinnamon/chromium hype — and the med-interaction warning.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.