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Potassium + Magnesium

Nutricost
4.8
★ ★ ★ ★ ★
(1807 ratings)
Magnesium 210 mg
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Score84
A low-cost magnesium citrate formula provides a useful dose, while its small potassium addition adds little beyond label appeal.
How scoring works
Quantity:240 Capsule(s) • (120 servings)
Goals:
General Health
Energy
Digestive Health
Heart Health
Cardiovascular Support
Stress Relief
Bone Health
Testosterone Support

Score 84

A low-cost magnesium citrate formula provides a useful dose, while its small potassium addition adds little beyond label appeal.
How scoring works
$13.95($0.11 per serving)
Walmart
$ 13.95
iHerb
$ 13.95
Vitacost
$ 13.95
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Analysis

Magnesium citrate supplies 210 mg of elemental magnesium with moderate absorption. Potassium citrate adds 99 mg of potassium, which is clearly disclosed but small relative to daily dietary needs.

Two capsules provide an economical serving and avoid the poor absorption of magnesium oxide. The potassium addition does not specifically enhance magnesium uptake or replace potassium-rich foods.

It fits people who want a moderate magnesium amount with a small electrolyte addition. Users seeking meaningful potassium replacement should not rely on this formula alone.

Who is it for
  • Adults seeking moderate magnesium citrate
  • People who want a small potassium addition
  • Budget-conscious capsule users
Best for
  • General magnesium support
  • Two-capsule divided use
  • Low-cost citrate supplementation

Pros

  • Provides 210 mg magnesium citrate
  • Uses clearly identified potassium citrate
  • Low serving cost
  • Straightforward two-mineral formula

Cons

  • Potassium amount is nutritionally modest
  • Citrate may loosen stools
  • No targeted magnesium cofactor
  • Requires two capsules per serving

Warnings

  • The 210 mg citrate serving of supplemental magnesium may cause loose stools, cramping, or nausea; a smaller divided amount may be easier to tolerate.
  • People with kidney disease or medicines that raise potassium should account for the added potassium citrate.
  • Magnesium can reduce absorption of tetracycline or quinolone antibiotics; follow the prescriber or pharmacist’s spacing instructions.
  • Magnesium can interfere with levothyroxine absorption and should be separated according to medication guidance.

Nutrient quality

88 Highest impact

Citrate provides a useful organic form for both magnesium and potassium. Magnesium is meaningfully dosed, while potassium provides only modest support, while the mineral amounts are conservative enough to avoid obvious excess for most healthy adults.

Ingredient transparency

81 Highest impact

Both mineral forms and amounts are stated clearly without a blend. Serving totals are apparent, but full directions and inactive ingredients are not supplied.

Customer satisfaction

70 High impact

The supplied average rating is strong. A large rating base gives the average good reliability, while complaint and firsthand experience details are unavailable.

Value for money

95 Highest impact

Formula quality supports the asking position well. The serving value is highly competitive within the category.

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Goals

Impact
Highest effect
A Goal FitB+ Strength of SupportB- CoverageA Formula Quality
Magnesium · 210 mg

Magnesium and potassium are foundational electrolytes with clear roles in muscle, nerve, and metabolic function. Both minerals are precisely disclosed in citrate forms.

The magnesium amount is meaningful, while potassium provides only a modest addition to daily needs. A focused two-mineral formula is coherent but cannot cover general wellness broadly.

Study evidence
Magnesium Supportive 114 studies
Impact
Highest effect
B+ Goal FitA Strength of SupportC- CoverageA+ Formula Quality
Magnesium · 210 mgPotassium · 99 mg

Magnesium citrate supports ATP-dependent metabolism and muscle function at a meaningful amount. Potassium citrate adds electrolyte support for normal muscle and nerve activity.

The combination is useful for mineral adequacy but does not provide acute alertness or direct mitochondrial fuel. Both mineral amounts and forms are fully disclosed in a focused formula.

Study evidence
Magnesium Supportive 4 studies
Potassium Supportive 2 studies
Impact
Highest effect
A- Goal FitA- Strength of SupportD+ CoverageA- Formula Quality
Magnesium · 210 mg

Magnesium citrate is directly relevant to stool softening and regularity. Potassium supports general electrolyte balance but adds little distinct digestive coverage.

The clearly disclosed magnesium amount provides meaningful depth in a suitable form. The compact mineral formula is coherent but remains limited to motility support.

Study evidence
Magnesium Supportive 50 studies
Impact
High effect
B+ Goal FitB Strength of SupportC+ CoverageA+ Formula Quality
Magnesium · 210 mg

Magnesium citrate supplies a meaningful 210 mg amount, while potassium citrate adds a modest 99 mg. Together they support normal electrolyte balance, vascular tone, and cardiac electrical function.

The combination covers more ground than magnesium alone, but potassium remains too low for strong targeted support. People with impaired kidney function or potassium-retaining medicines need individualized guidance before using supplemental potassium.

Study evidence
Magnesium Supportive 158 studies
Potassium Supportive 182 studies
Impact
High effect
B+ Goal FitB+ Strength of SupportC- CoverageA Formula Quality
Potassium · 99 mgMagnesium · 210 mg

Magnesium citrate supplies a useful, clearly stated amount that may support vascular tone and normal heart rhythm. Potassium citrate adds a small complementary mineral contribution.

The formula is focused and easy to assess. Its main limitation is narrow pathway coverage, since it does not address lipids or oxidative protection.

Study evidence
Magnesium Supportive 123 studies
Potassium Supportive 117 studies
Impact
High effect
B+ Goal FitA- Strength of SupportD+ CoverageA Formula Quality
Magnesium · 210 mg

Magnesium citrate provides the main stress-relevant value through foundational nervous-system and muscle support. Potassium citrate adds modest electrolyte context in a simple formula.

No direct calming amino acid or adaptogen is included, so pathway breadth remains narrow. Benefits are most likely when magnesium intake is inadequate.

Study evidence
Magnesium Supportive 13 studies

Ingredients

IngredientAmount per serving
Magnesium (Magnesium Citrate)
210 mg
Potassium (Potassium Citrate)
99 mg
Gluten Free Adults 18–50
Report overview
D Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyB+ Value

Magnesium citrate provides moderate absorption and a clearly stated therapeutic elemental dose. The potassium combination adds no preferred magnesium-uptake cofactor. A very low serving cost supports strong practical value.

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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Association between Serum Magnesium and Fractures: A Systematic Review and Meta-Analysis of Observational Studies.
    Dominguez LJ; Veronese N; Ciriminna S; Pérez-Albela JL; Vásquez-López VF; Rodas-Regalado S; Di Bella G; Parisi A; Tagliaferri F; Barbagallo M · Nutrients · 2023
    Meta-analysis119,755 participants4 studies pooledBone Health forMagnesium
  2. Bioabsorbable Magnesium-Based Materials Potential and Safety in Bone Surgery: A Systematic Review.
    Hung CH; Kwok YC; Yip J; Wong HH; Leung YY · Craniomaxillofacial trauma & reconstruction · 2025
    Systematic review386 participants8 studies pooledBone Health forMagnesium
  3. Vascularized bone grafting fixed by biodegradable magnesium screw for treating osteonecrosis of the femoral head.
    Zhao D; Huang S; Lu F; Wang B; Yang L; Qin L; Yang K; Li Y; Li W; Wang W; Tian S; Zhang X; Gao W; Wang Z; Zhang Y; Xie X; Wang J; Li J · Biomaterials · 2016
    Randomized trial48 participantsBone Health forMagnesium
  4. An update on magnesium and bone health.
    Rondanelli M; Faliva MA; Tartara A; Gasparri C; Perna S; Infantino V; Riva A; Petrangolini G; Peroni G · Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine · 2022
    Narrative reviewBone Health forMagnesium
  5. Sex-specific differences in the association of magnesium intake with femoral neck bone mineral density among older adults.
    Wang B; Tan X; Yao X; Zhu Z · Endocrine connections · 2025
    Cross-sectional study1,343 participantsBone Health forMagnesium
  6. Effect of potassium citrate on bone density, microarchitecture, and fracture risk in healthy older adults without osteoporosis: a randomized controlled trial.
    Jehle S; Hulter HN; Krapf R · The Journal of clinical endocrinology and metabolism · 2013
    Randomized trial201 participantsBone Health forPotassium
  7. Long-term persistence of the urine calcium-lowering effect of potassium bicarbonate in postmenopausal women.
    Frassetto L; Morris RC; Sebastian A · The Journal of clinical endocrinology and metabolism · 2005
    Randomized trial170 participantsBone Health forPotassium
  8. Partial neutralization of the acidogenic Western diet with potassium citrate increases bone mass in postmenopausal women with osteopenia.
    Jehle S; Zanetti A; Muser J; Hulter HN; Krapf R · Journal of the American Society of Nephrology : JASN · 2007
    Randomized trial161 participantsBone Health forPotassium
  9. Potassium citrate supplementation results in sustained improvement in calcium balance in older men and women.
    Moseley KF; Weaver CM; Appel L; Sebastian A; Sellmeyer DE · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2013
    Randomized trial52 participantsBone Health forPotassium
  10. Effects of potassium chloride and potassium bicarbonate on endothelial function, cardiovascular risk factors, and bone turnover in mild hypertensives.
    He FJ; Marciniak M; Carney C; Markandu ND; Anand V; Fraser WD; Dalton RN; Kaski JC; MacGregor GA · Hypertension (Dallas, Tex. : 1979) · 2010
    Randomized trial42 participantsBone Health forPotassium
  11. Circulating and dietary magnesium and risk of cardiovascular disease: a systematic review and meta-analysis of prospective studies.
    Del Gobbo LC; Imamura F; Wu JH; de Oliveira Otto MC; Chiuve SE; Mozaffarian D · The American journal of clinical nutrition · 2013
    Meta-analysis313,041 participants16 studies pooledCardiovascular Support forMagnesium
  12. Magnesium and the risk of cardiovascular events: a meta-analysis of prospective cohort studies.
    Qu X; Jin F; Hao Y; Li H; Tang T; Wang H; Yan W; Dai K · PloS one · 2013
    Meta-analysis532,979 participants19 studies pooledCardiovascular Support forMagnesium
  13. Quantitative Association Between Serum/Dietary Magnesium and Cardiovascular Disease/Coronary Heart Disease Risk: A Dose-Response Meta-analysis of Prospective Cohort Studies.
    Zhao L; Hu M; Yang L; Xu H; Song W; Qian Y; Zhao M · Journal of cardiovascular pharmacology · 2020
    Meta-analysis544,581 participants18 studies pooledCardiovascular Support Heart Health forMagnesium
  14. Comparative Efficacy of Nutraceuticals on Endothelial Function: A Systematic Review and Network Meta-Analysis.
    Norouzzadeh M; Rashedi MH; Mahdavi-Mazdeh G; Kosari A; Shahinfar H · Current atherosclerosis reports · 2026
    Meta-analysisCardiovascular Support Heart Health forMagnesium
  15. Serum magnesium, mortality, and cardiovascular disease in chronic kidney disease and end-stage renal disease patients: a systematic review and meta-analysis.
    Xiong J; He T; Wang M; Nie L; Zhang Y; Wang Y; Huang Y; Feng B; Zhang J; Zhao J · Journal of nephrology · 2020
    Meta-analysis200,934 participants20 studies pooledCardiovascular Support forMagnesium
  16. 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.
    Gan L; Zhao B; Inoue-Choi M; Liao LM; Graubard BI; Weinstein SJ; Albanes D; Huang J · BMC medicine · 2024
    Meta-analysis416,104 participantsCardiovascular Support forPotassium
  17. Potassium intake, stroke, and cardiovascular disease a meta-analysis of prospective studies.
    D'Elia L; Barba G; Cappuccio FP; Strazzullo P · Journal of the American College of Cardiology · 2011
    Meta-analysis247,510 participants11 studies pooledCardiovascular Support Heart Health forPotassium
  18. Blood pressure response to changes in sodium and potassium intake: a metaregression analysis of randomised trials.
    Geleijnse JM; Kok FJ; Grobbee DE · Journal of human hypertension · 2003
    Meta-analysis27 studies pooledCardiovascular Support forPotassium
  19. Twenty-Four-Hour Urinary Sodium and Potassium Excretion and Their Associations With Blood Pressure Among Adults in China: Baseline Survey of Action on Salt China.
    Li Y; Zhang P; Wu J; Ma J; Xu J; Zhang X; Luo R; Liu M; Sun Y; Li X; Tan M; He FJ; MacGregor GA; Li X · Hypertension (Dallas, Tex. : 1979) · 2021
    Cross-sectional study5,353 participantsCardiovascular Support forPotassium
  20. Dietary Sodium and Potassium Intake and Risk of Non-Fatal Cardiovascular Diseases: The Million Veteran Program.
    Wang DD; Li Y; Nguyen XT; Song RJ; Ho YL; Hu FB; Willett WC; Wilson PWF; Cho K; Gaziano JM; Djoussé L; On Behalf Of The Va Million Veteran Program · Nutrients · 2022
    Cohort study180,156 participantsCardiovascular Support forPotassium
  21. Efficacy of oral magnesium therapy in the treatment of chronic constipation in spastic cerebral palsy children: a randomized controlled trial.
    Hassanein SMA; Deifallah SM; Bastawy HA · World journal of pediatrics : WJP · 2021
    Randomized trial100 participantsDigestive Health forMagnesium
  22. Ca:Mg ratio, medium-chain fatty acids, and the gut microbiome.
    Fan L; Zhu X; Sun S; Yu C; Huang X; Ness R; Dugan LL; Shu L; Seidner DL; Murff HJ; Fodor AA; Azcarate-Peril MA; Shrubsole MJ; Dai Q · Clinical nutrition (Edinburgh, Scotland) · 2022
    Randomized trial240 participantsDigestive Health forMagnesium
  23. The Magnesium-Rich Formula for Functional Constipation in Infants: a Randomized Comparator-Controlled Study.
    Benninga MA; MENA Infant Constipation Study Group; Vandenplas Y · Pediatric gastroenterology, hepatology & nutrition · 2022
    Randomized trial286 participantsDigestive Health forMagnesium
  24. A Randomized Double-blind Placebo-controlled Trial on the Effect of Magnesium Oxide in Patients With Chronic Constipation.
    Mori S; Tomita T; Fujimura K; Asano H; Ogawa T; Yamasaki T; Kondo T; Kono T; Tozawa K; Oshima T; Fukui H; Kimura T; Watari J; Miwa H · Journal of neurogastroenterology and motility · 2022
    Randomized trial34 participantsDigestive Health forMagnesium
  25. Magnesium treatment increases gut microbiome synthesizing vitamin D and inhibiting colorectal cancer: results from a double-blind precision-based randomized placebo-controlled trial.
    Sun E; Zhu X; Ness RM; Murff HJ; Sun S; Yu C; Fan L; Azcarate-Peril MA; Shrubsole MJ; Dai Q · The American journal of clinical nutrition · 2025
    Randomized trial240 participantsDigestive Health forMagnesium
  26. Magnesium-L-threonate improves sleep quality and daytime functioning in adults with self-reported sleep problems: A randomized controlled trial.
    Hausenblas HA; Lynch T; Hooper S; Shrestha A; Rosendale D; Gu J · Sleep medicine: X · 2025
    Randomized trial80 participantsEnergy forMagnesium
  27. Total magnesium intake and risk of frailty in older women.
    Struijk EA; Fung TT; Bischoff-Ferrari HA; Willett WC; Lopez-Garcia E · Journal of cachexia, sarcopenia and muscle · 2024
    Cohort study81,524 participantsEnergy forMagnesium
  28. Red blood cell magnesium and chronic fatigue syndrome.
    Cox IM; Campbell MJ; Dowson D · Lancet (London, England) · 1991
    Randomized trial32 participantsEnergy forMagnesium
  29. Exercise, magnesium and immune function.
    Laires MJ; Monteiro C · Magnesium research · 2008
    Narrative reviewEnergy forMagnesium
  30. [Efficacy of potassium N-acetylaminosuccinate (Cogitum) in the treatment of asthenic syndrome: results of double-blind placebo-controlled trial].
    Esin RG; Khayrullin IK; Esin OR; Fatykhova AF; Gismatullina EI; Isaeva YN · Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova · 2023
    Randomized trial37 participantsEnergy forPotassium
  31. Human resting energy expenditure in relation to dietary potassium.
    Dériaz O; Thériault G; Lavallée N; Fournier G; Nadeau A; Bouchard C · The American journal of clinical nutrition · 1991
    Randomized trial8 participantsEnergy forPotassium
  32. Perioperative systemic magnesium to minimize postoperative pain: a meta-analysis of randomized controlled trials.
    De Oliveira GS; Castro-Alves LJ; Khan JH; McCarthy RJ · Anesthesiology · 2013
    Meta-analysis1,257 participants20 studies pooledGeneral Health forMagnesium
  33. Long-term outcome after intravenous magnesium sulphate in suspected acute myocardial infarction: the second Leicester Intravenous Magnesium Intervention Trial (LIMIT-2).
    Woods KL; Fletcher S · Lancet (London, England) · 1994
    Randomized trial2,316 participantsGeneral Health forMagnesium
  34. Association of magnesium sulfate use with mortality in critically ill patients with sepsis: a retrospective propensity score-matched cohort study.
    Gu WJ; Duan XJ; Liu XZ; Cen Y; Tao LY; Lyu J; Yin HY · British journal of anaesthesia · 2023
    Cohort study10,999 participantsGeneral Health forMagnesium
  35. Hypomagnesemia and Mortality in Incident Hemodialysis Patients.
    Li L; Streja E; Rhee CM; Mehrotra R; Soohoo M; Brunelli SM; Kovesdy CP; Kalantar-Zadeh K · American journal of kidney diseases : the official journal of the National Kidney Foundation · 2016
    Cohort study9,359 participantsGeneral Health forMagnesium
  36. The effects of magnesium supplementation on abnormal uterine bleeding, alopecia, quality of life, and acne in women with polycystic ovary syndrome: a randomized clinical trial.
    Jaripur M; Ghasemi-Tehrani H; Askari G; Gholizadeh-Moghaddam M; Clark CCT; Rouhani MH · Reproductive biology and endocrinology : RB&E · 2022
    Randomized trial64 participantsGeneral Health forMagnesium
  37. Effects of magnesium supplementation on improving hyperglycemia, hypercholesterolemia, and hypertension in type 2 diabetes: A pooled analysis of 24 randomized controlled trials.
    Xu L; Li X; Wang X; Xu M · Frontiers in nutrition · 2023
    Meta-analysis1,325 participants24 studies pooledHeart Health forMagnesium
  38. The effect of lowering blood pressure by magnesium supplementation in diabetic hypertensive adults with low serum magnesium levels: a randomized, double-blind, placebo-controlled clinical trial.
    Guerrero-Romero F; Rodríguez-Morán M · Journal of human hypertension · 2009
    Randomized trial82 participantsHeart Health forMagnesium
  39. Positive effects of magnesium supplementation in metabolic syndrome.
    Kisters S; Kisters K; Werner T; Vormann J; Tokmak F; Westhoff T; Gröber U; Predel HG; Reuter H · International journal of clinical pharmacology and therapeutics · 2024
    Randomized trial54 participantsHeart Health forMagnesium
  40. Oral potassium supplementation for management of essential hypertension: A meta-analysis of randomized controlled trials.
    Poorolajal J; Zeraati F; Soltanian AR; Sheikh V; Hooshmand E; Maleki A · PloS one · 2017
    Meta-analysis1,213 participants23 studies pooledHeart Health forPotassium
  41. Joint association of urinary sodium and potassium excretion with cardiovascular events and mortality: prospective cohort study.
    O'Donnell M; Mente A; Rangarajan S; McQueen MJ; O'Leary N; Yin L; Liu X; Swaminathan S; Khatib R; Rosengren A; Ferguson J; Smyth A; Lopez-Jaramillo P; Diaz R; Avezum A; Lanas F; Ismail N; Yusoff K; Dans A; Iqbal R; Szuba A; Mohammadifard N; Oguz A; Yusufali AH; Alhabib KF; Kruger IM; Yusuf R; Chifamba J; Yeates K; Dagenais G; Wielgosz A; Lear SA; Teo K; Yusuf S; PURE Investigators · BMJ (Clinical research ed.) · 2019
    Cohort study103,570 participantsHeart Health forPotassium
  42. Effect of Potassium Supplementation on Endothelial Function: A Systematic Review and Meta-Analysis of Intervention Studies.
    D'Elia L; Cappuccio FP; Masulli M; La Fata E; Rendina D; Galletti F · Nutrients · 2023
    Meta-analysis332 participants5 studies pooledHeart Health forPotassium
  43. Effects of potassium supplementation on office, home, and 24-h blood pressure in patients with essential hypertension.
    Kawano Y; Minami J; Takishita S; Omae T · American journal of hypertension · 1999
    Randomized trial55 participantsHeart Health forPotassium
  44. Role of magnesium supplementation in the treatment of depression: A randomized clinical trial.
    Tarleton EK; Littenberg B; MacLean CD; Kennedy AG; Daley C · PloS one · 2017
    Randomized trial126 participantsStress Relief forMagnesium
  45. Effects of Intravenous Esketamine or Magnesium Sulfate on Early Postoperative Negative Emotions and Pain in Patients Undergoing Endoscopic Sinus Surgery: A Randomized Controlled Trial.
    Wang L; Zhou J; Liu Q; Qian K; Wang L; Xie C · Therapeutics and clinical risk management · 2026
    Randomized trial137 participantsStress Relief forMagnesium
  46. Effect of short-term magnesium supplementation on anxiety, depression and sleep quality in patients after open-heart surgery.
    Saba S; Faizi F; Sepandi M; Nehrir B · Magnesium research · 2022
    Non-randomized trial60 participantsStress Relief forMagnesium
  47. Effects of dry needling compared to magnesium infiltration in trigger points for patients with myofascial pain syndrome: a randomized controlled study in Tunisia.
    Dhouibi J; Moncer R; Kalbousi N; Gaddour M; Laayouni S; Ouanes W; Kacem B; Jemni S · Korean journal of family medicine · 2026
    Randomized trial45 participantsStress Relief forMagnesium
  48. Effect of magnesium and vitamin B6 supplementation on mental health and quality of life in stressed healthy adults: Post-hoc analysis of a randomised controlled trial.
    Noah L; Dye L; Bois De Fer B; Mazur A; Pickering G; Pouteau E · Stress and health : journal of the International Society for the Investigation of Stress · 2021
    Randomized trialStress Relief forMagnesium
  49. Magnesium and anabolic hormones in older men.
    Maggio M; Ceda GP; Lauretani F; Cattabiani C; Avantaggiato E; Morganti S; Ablondi F; Bandinelli S; Dominguez LJ; Barbagallo M; Paolisso G; Semba RD; Ferrucci L · International journal of andrology · 2012
    Cohort study399 participantsTestosterone Support forMagnesium
  50. Analysis of the relationship between the blood concentration of several metals, macro- and micronutrients and endocrine disorders associated with male aging.
    Rotter I; Kosik-Bogacka DI; Dołęgowska B; Safranow K; Kuczyńska M; Laszczyńska M · Environmental geochemistry and health · 2017
    Cross-sectional study313 participantsTestosterone Support forMagnesium
  51. Effect of magnesium supplementation in improving hyperandrogenism, hirsutism, and sleep quality in women with polycystic ovary syndrome: A randomized, placebo-controlled clinical trial.
    Gholizadeh-Moghaddam M; Ghasemi-Tehrani H; Askari G; Jaripur M; Clark CCT; Rouhani MH · Health science reports · 2024
    Randomized trial64 participantsTestosterone Support forMagnesium
  52. The effects of trace element supplementation on glycolipid metabolism in PCOS: a systematic review and meta-analysis.
    Yang L; Gao Y; Zhao W; Qi Y; Duo X; Wang H · Frontiers in nutrition · 2025
    Meta-analysis1,600 participants25 studies pooledTestosterone Support forMagnesium
  53. Effects of magnesium supplementation on testosterone levels of athletes and sedentary subjects at rest and after exhaustion.
    Cinar V; Polat Y; Baltaci AK; Mogulkoc R · Biological trace element research · 2011
    Non-randomized trial20 participantsTestosterone Support forMagnesium