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Magnesium Complex 300 mg

4.7
★ ★ ★ ★ ★
(81 ratings)
Magnesium 300 mg
Product Image
Score79
A low-cost, high-amount blend includes citrate but leans on weaker carbonate and oxide forms. It is more practical for basic or motility use than high-confidence systemic support.
How scoring works
Tablet
Quantity:100 Tablet(s) • (100 servings)
Goals:
Heart Health
General Health
Stress Relief
Energy
Cardiovascular Support

Score 79

A low-cost, high-amount blend includes citrate but leans on weaker carbonate and oxide forms. It is more practical for basic or motility use than high-confidence systemic support.
How scoring works
$8.97($0.08 per serving)
Walmart
$ 8.97
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Analysis

Magnesium carbonate, citrate, and oxide combine for a clearly stated 300 mg amount. Citrate improves the profile, while carbonate and oxide are less compelling for efficient systemic absorption.

The blend may support bowel motility and can contribute to intake when magnesium is low. Its actual absorbed contribution is likely less impressive than the large label amount suggests.

A one-tablet serving and short active list are practical strengths. Users focused on relaxation, muscle recovery, or cardiovascular support may prefer glycinate, malate, or a fully citrate-based product.

Who is it for
  • Adults seeking an inexpensive magnesium tablet
  • People who tolerate carbonate and oxide forms
Best for
  • Basic intake support
  • Occasional magnesium-related bowel motility

Pros

  • Substantial 300 mg amount
  • Includes some magnesium citrate
  • Simple one-tablet serving

Cons

  • Carbonate and oxide reduce form quality
  • Contribution from each source is not disclosed
  • Absorbed delivery may trail the label amount

Warnings

  • The 300 mg mixed-form serving may cause loose stools, cramping, or urgency.
  • Magnesium can bind tetracycline or quinolone antibiotics and oral bisphosphonates, so these medicines should be taken several hours apart.
  • Impaired kidney function can reduce magnesium clearance, making a large supplemental amount less appropriate without clinical guidance.

Nutrient quality

81 Highest impact

Carbonate and oxide weaken absorption despite the inclusion of citrate. The stated magnesium amount is well aligned with common supplemental use.

Ingredient transparency

84 Highest impact

The total elemental magnesium amount is clear. All three magnesium forms are stated, although their individual shares are not.

Customer satisfaction

63 Moderate impact

The aggregate rating is strong and the available feedback volume gives it useful support. No specific review comments are supplied to assess recurring benefits or complaints.

Value for money

87 Highest impact

Very low routine cost offsets some of the blend’s weak form quality. No unrelated active additions are included.

Report analysis

Goals

Heart Health
Healthy Blood Pressure
Heart Health
Impact
High effect
B+ Goal FitB- Strength of SupportD+ CoverageA+ Formula Quality
Magnesium · 300 mg

Magnesium directly supports vascular tone and normal cardiac function. Its cardiovascular role is established, especially when intake is inadequate.

The elemental amount is well aligned. Carbonate and oxide dominate the blend and limit systemic absorption despite some citrate.

Study evidence
Magnesium Supportive 158 studies
General Health
Stress Resilience
General Health
Impact
High effect
A- Goal FitC+ Strength of SupportC CoverageB+ Formula Quality
Magnesium · 300 mg

The elemental magnesium amount is well suited to foundational metabolic, nerve, and muscle support. A low-cost single-mineral design keeps the purpose clear.

Magnesium carbonate and oxide likely reduce absorption despite the inclusion of citrate. The formula offers strong dose depth but limited pathway breadth and only moderate form quality.

Study evidence
Magnesium Supportive 114 studies
Stress Relief
Calm and Tension Relief
Stress Relief
Impact
High effect
B Goal FitB- Strength of SupportD+ CoverageA Formula Quality
Magnesium · 300 mg

Magnesium at 300 mg provides direct foundational support for normal nervous-system regulation and may help when low intake contributes to tension. Citrate is included, but carbonate and oxide dominate the stated form profile and weaken absorption quality.

The single-mineral design gives this pathway useful depth but does not add an adaptogen or direct calming amino acid. Digestive tolerance and practical benefit will depend heavily on the magnesium form.

Study evidence
Magnesium Supportive 13 studies
Energy
Energy
Impact
High effect
B- Goal FitB- Strength of SupportC CoverageB+ Formula Quality
Magnesium · 300 mg

A 300 mg magnesium serving supports cellular energy reactions at a meaningful amount. Carbonate and oxide dominate the blend, so absorption is weaker than the total dose suggests.

The single-mineral design is simple and clearly disclosed. It supports one metabolic cofactor pathway but does not address acute alertness, direct fuel, or stress resilience.

Study evidence
Magnesium Supportive 4 studies
Cardiovascular Support
Heart Muscle and Rhythm
Cardiovascular Support
Impact
High effect
B+ Goal FitC Strength of SupportF CoverageA- Formula Quality
Magnesium · 300 mg

Magnesium directly supports vascular relaxation and normal heart rhythm, and the elemental amount is well aligned with routine supplementation. Evidence for magnesium is strong, especially when intake is inadequate.

Carbonate and oxide weaken absorption despite the inclusion of citrate. The simple formula avoids padding, but better-absorbed forms would offer more dependable systemic support.

Study evidence
Magnesium Supportive 123 studies
Bone Health
Bone Mineral Density
Bone Health
Impact
Moderate effect
B- Goal FitC Strength of SupportD CoverageC+ Formula Quality
Magnesium · 300 mg

A full supplemental amount of magnesium supports bone mineral structure and vitamin D metabolism. The formula remains narrow because it supplies no calcium, vitamin D, vitamin K, or protein-matrix support.

Clear elemental labeling makes the serving easy to assess. Carbonate and oxide weaken expected absorption despite the inclusion of citrate.

Study evidence
Magnesium Supportive 48 studies
Digestive Health
Bowel Regularity
Digestive Health
Impact
Moderate effect
B- Goal FitC Strength of SupportD- CoverageC+ Formula Quality
Magnesium · 300 mg

The magnesium blend may support bowel motility and occasional constipation. Citrate is relevant to this use, while carbonate and oxide make the effect and absorption less predictable.

The elemental amount is clearly stated and sits in a useful daily range. A single mineral pathway keeps the formula focused but does not address other digestive needs.

Study evidence
Magnesium Supportive 50 studies

Ingredients

IngredientAmount per serving
Magnesium (Magnesium Carbonate, Magnesium Citrate, Magnesium Oxide)
 300 mg
Gluten Free Adults 18–50
Report overview
Magnesium (Magnesium Carbonate, Magnesium Citrate, Magnesium Oxide) · 300 mg OverallScore51
F Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyD Value

Carbonate and oxide dominate the blend and limit systemic absorption despite the inclusion of citrate. The elemental amount is clearly stated and well aligned with the target range. The very low serving cost helps, but weak form quality reduces the amount of useful magnesium delivered.

View ingredientView products
Loading alternative details
91 Performance

Krebs Magnesium Potassium Complex

Nature's Way
Magnesium lysinate and malate provide favorable forms at a useful amount, with a modest potassium contribution. The clearly identified form provides a more predictable magnesium option than the original’s mixed or less fully described formulation. The formula remains focused rather than comprehensive.
88 Performance

Magnesium Bisglycinate Powder

NOW
Magnesium bisglycinate supplies a well-absorbed form at a practical amount in an adjustable powder. The clearly identified form provides a more predictable magnesium option than the original’s mixed or less fully described formulation. The single-mineral design does not address needs beyond magnesium.
85 Performance

Magnesium Bisglycinate 200 mg

Natural Factors
Magnesium bisglycinate provides a highly absorbable form at a moderate amount suited to routine use. The clearly identified form provides a more predictable magnesium option than the original’s mixed or less fully described formulation. The focused formula offers no additional electrolyte or relaxation ingredients.
83 Budget

Magnesium Citrate Pure Powder

Best Naturals
Magnesium citrate in an adjustable powder provides useful absorption with a clearly stated amount. Its lower serving cost improves affordability, while citrate may loosen stools in sensitive users.
80 Budget

Magnesium Caps 500 mg

Life Extension
Citrate, succinate, and named glycinate broaden the magnesium forms in a very economical capsule. Its lower serving cost improves affordability, while the oxide portion lowers average absorption, and the large amount may cause diarrhea or cramping.
74 Budget

Potassium + Magnesium

Nutricost
Magnesium citrate with a modest potassium addition creates a simple two-mineral electrolyte formula. No eligible candidate in this slot is cheaper than the original; potassium is only a supporting amount, and citrate may loosen stools in sensitive users.
80 Value

Magnesium Bisglycinate Chelate

Healthy Origins
TRAACS magnesium bisglycinate combines premium form quality, a useful elemental amount, and a clean powder format. The serving costs more, so the value advantage depends on prioritizing form quality. The formula is narrow, and supplied customer satisfaction is less convincing than its ingredient quality.
78 Value

Magnesium Citrate 420 mg

Nutricost
A substantial magnesium citrate amount offers useful absorption in a focused, economical formula. The serving costs more, so the value advantage depends on prioritizing form quality. The higher amount may loosen stools or cause abdominal discomfort in sensitive users.
77 Value

Magnesium Citrate 200 mg

The Vitamin Shoppe
A moderate magnesium citrate amount provides practical daily supplementation in a simple tablet. The serving costs more, so the value advantage depends on prioritizing form quality. Tablet excipients and complete directions are not supplied, and citrate may affect digestive tolerance.
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Sources

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

  1. Magnesium status and magnesium therapy in critically ill patients: A systematic review.
    Fairley J; Glassford NJ; Zhang L; Bellomo R · Journal of critical care · 2016
    Systematic review34 studies pooledGeneral Health forMagnesium
  2. Hospital-Acquired Dysmagnesemia and In-Hospital Mortality.
    Cheungpasitporn W; Thongprayoon C; Chewcharat A; Petnak T; Mao MA; Davis PW; Bathini T; Vallabhajosyula S; Qureshi F; Erickson SB · Medical sciences (Basel, Switzerland) · 2024
    Cohort study26,020 participantsGeneral Health forMagnesium
  3. 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
  4. 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
  5. 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
  6. The association between circulating magnesium and clinically relevant outcomes in patients with chronic kidney disease: A systematic review and meta-analysis.
    Leenders NHJ; Vermeulen EA; van Ballegooijen AJ; Hoekstra T; de Vries R; Beulens JW; Vervloet MG · Clinical nutrition (Edinburgh, Scotland) · 2021
    Meta-analysis348,059 participants33 studies pooledGeneral Health forMagnesium
  7. 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 pooledGeneral Health Cardiovascular Support forMagnesium
  8. Magpie Trial in the UK: methods and additional data for women and children at 2 years following pregnancy complicated by pre-eclampsia.
    Smyth RM; Spark P; Armstrong N; Duley L · BMC pregnancy and childbirth · 2009
    Randomized trial1,601 participantsGeneral Health forMagnesium
  9. 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
  10. Effects of oral magnesium therapy on exercise tolerance, exercise-induced chest pain, and quality of life in patients with coronary artery disease.
    Shechter M; Bairey Merz CN; Stuehlinger HG; Slany J; Pachinger O; Rabinowitz B · The American journal of cardiology · 2003
    Randomized trial187 participantsGeneral Health forMagnesium
  11. The effect of food, vitamin, or mineral supplements on chronic constipation in adults: A systematic review and meta-analysis of randomized controlled trials.
    van der Schoot A; Creedon A; Whelan K; Dimidi E · Neurogastroenterology and motility · 2023
    Meta-analysis787 participants8 studies pooledDigestive Health forMagnesium
  12. Lactobacillus casei rhamnosus Lcr35 in children with chronic constipation.
    Bu LN; Chang MH; Ni YH; Chen HL; Cheng CC · Pediatrics international : official journal of the Japan Pediatric Society · 2007
    Randomized trial45 participantsDigestive Health forMagnesium
  13. 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
  14. 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
  15. Magnesium-Rich Mineral Water Improves Stool Consistency and Bowel Habits in Healthy Subjects: A Randomized Controlled Trial.
    Yoneda H; Tomita T; Kitano T; Morishita D; Kodani M; Nishii N; Sei H; Eda H; Sato T; Kawai M; Yokoyama Y; Igeta M; Okugawa T; Fukui H; Shinzaki S · Neurogastroenterology and motility · 2026
    Randomized trial40 participantsDigestive Health forMagnesium
  16. Lactobacillus reuteri DSM 17938 and Magnesium Oxide in Children with Functional Chronic Constipation: A Double-Blind and Randomized Clinical Trial.
    Kubota M; Ito K; Tomimoto K; Kanazaki M; Tsukiyama K; Kubota A; Kuroki H; Fujita M; Vandenplas Y · Nutrients · 2020
    Randomized trial60 participantsDigestive Health forMagnesium
  17. Diagnosis of magnesium-induced diarrhea.
    Fine KD; Santa Ana CA; Fordtran JS · The New England journal of medicine · 1991
    Clinical trial19 participantsDigestive Health forMagnesium
  18. 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
  19. Effect of the laxative magnesium oxide on gastrointestinal functional recovery in fast-track colonic resection: a double-blind, placebo-controlled randomized study.
    Andersen J; Christensen H; Pachler JH; Hallin M; Thaysen HV; Kehlet H · Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland · 2012
    Randomized trial49 participantsDigestive Health forMagnesium
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. Red blood cell magnesium and chronic fatigue syndrome.
    Cox IM; Campbell MJ; Dowson D · Lancet (London, England) · 1991
    Randomized trial32 participantsEnergy forMagnesium
  34. Exercise, magnesium and immune function.
    Laires MJ; Monteiro C · Magnesium research · 2008
    Narrative reviewEnergy forMagnesium
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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