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Head-to-head evidence comparison — which supplement is right for you?
Potassium wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
2 of 2 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
10 of 15 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Glycerol and Potassium have evidence — compare verdict strength side-by-side.
1-1.5g per kg body weight
1-2.5 hours before endurance exercise, Consume with large volume of fluid (1-2L)
Glycerol powder (65% concentration typical)
99-500mg daily from supplements (food provides more)
With food to reduce GI upset, Spread throughout day, During/after exercise for athletes
Potassium Citrate or Potassium Gluconate
During exercise (1-3 hours post-ingestion)
During exercise in heat
During exercise
1-2 hours post-ingestion
2-4 weeks
1-2 weeks
Long-term
With excess or kidney issues
Nutritional Ergogenic Aids in Combat Sports: A Systematic Review and Meta-Analysis
Nutrients (2022) · Meta analysis
In this regard, abilities including the number of attacks, reaction time, handgrip strength, power and TTE, among others, were improved.
The effect of pre-exercise oral hyperhydration on endurance exercise performance, heart rate, and thermoregulation: a meta-analytical review
Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme (2024) · Meta analysis
Meta-analysis determined overall effect size (Hedges' g), and meta-regression the influence of independent moderators (ambient temperature, hyperhydration agent, exercise mode, extent of hyperhydration).
Meta-analysis: Effects of glycerol administration on plasma volume, haemoglobin, and haematocrit
Drug testing and analysis (2013) · Meta analysis
The meta-analysis revealed that the increase in plasma volume was 3.3% larger (95%-CI: 1.1-5.5%) after glycerol administration when compared to fluid only.
Effect of changes in potassium intake on blood pressure: a dose–response meta-analysis of randomized clinical trials (2000–2024)
Clinical Kidney Journal (2025) · Meta analysis · n=2500
Dose-response analysis of RCTs from 2000-2024
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.
Sex-specific associations between sodium and potassium intake and overall and cause-specific mortality: a large prospective U.S. cohort study, systematic review, and updated meta-analysis of cohort studies
BMC medicine (2024) · Meta analysis · n=237036
Meta-analysis examining Potassium efficacy
Based on meta-analysis showing hyperhydration effects on endurance. Conservative effectiveness given limited direct glycerol performance studies in the provided evidence. GI side effects increase notably at higher doses.
AI-estimated from published studies. Interpret as directional guidance.
Potassium has a higher evidence score (8.5/10 vs 5.8/10) and wins in 2 of 3 categories.
For speed up recovery, Glycerol has a higher relevance score (55 vs 50).
No known interactions between Glycerol and Potassium have been documented in our database. However, always consult a healthcare provider before combining supplements.