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Head-to-head evidence comparison — which supplement is right for you?
Magnesium vs Sodium Bicarbonate: Magnesium has the stronger overall evidence (8.5 vs 7.5/10); they're alternatives for improve endurance — 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
Mixed evidence
2 of 6 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
3 of 4 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
0.2-0.3g per kg bodyweight (14-21g for 70kg person)
60-180 minutes before exercise, Split into multiple doses
Pharmaceutical-grade sodium bicarbonate powder or capsules
and 4 more not shown
1-2 weeks
1-2 weeks
1 week
Immediate
Acute (1-3 hours)
Acute
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.
Sodium Bicarbonate Treatment and Clinical Outcomes in Chronic Kidney Disease with Metabolic Acidosis: A Meta-Analysis
Clinical journal of the American Society of Nephrology : CJASN (2024) · Meta analysis · n=2037
Fourteen RCTs comprising 2037 patients demonstrated that sodium bicarbonate supplementation significantly improved eGFR (standardized mean difference [SMD], 0.33; 95% confidence interval [CI], 0.03 to 0.63; P = 0.03).
Nutritional Ergogenic Aids in Cycling: A Systematic Review
Nutrients (2024) · Systematic review · n=701
However, no statistically significant effects were identified for the remaining supplements, whether administered individually or in combination.
Effects of Different Dietary Supplements on Swimming Performance: A Systematic Review and Network Meta-Analysis
Nutrients (2024) · Meta analysis
L-arginine (Arg) demonstrated superior performance to the placebo (SMD = -1.66, 95% CI [-2.92, -0.44]), emerging as the most effective intervention for reducing 100 swimming time (SUCRA = 89.5%).
The ISSN position stand (PMID 34503527) reviews single-dose trials at 0.2 to 0.5 g/kg: 0.2 g/kg appears to be the minimum dose that improves performance, 0.3 g/kg the optimum, and 0.4 or 0.5 g/kg add no benefit over 0.3 g/kg while causing more frequent and more severe side effects such as bloating, nausea, vomiting and abdominal pain, so the curve is flat above 0.3 g/kg while side effects rise. The benefit is mainly for high-intensity efforts of 30 seconds to 12 minutes. At 0.3 g/kg, a crossover trial in 14 trained cyclists improved 40 km time trial performance (PMID 39068627), and a meta-analysis found effects on anaerobic but not aerobic metabolism (PMID 33546730).
AI-estimated from published studies. Interpret as directional guidance.
Magnesium has a higher evidence score (8.5/10 vs 7.5/10) and wins in 2 of 3 categories.
For improve endurance, Sodium Bicarbonate has a higher relevance score (90 vs 48).
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.