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Magnesium 300

4.9
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(5948 ratings)
Magnesium 300 mg
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Score85
Three useful magnesium forms provide balanced absorption and a solid 300 mg amount. The blend is versatile but comparatively expensive and lacks a named chelation standard.
How scoring works
Capsule
Quantity:120 Capsule(s) • (60 servings)
Goals:
General Health
Stress Relief
Heart Health
Energy
Cardiovascular Support
Testosterone Support
Bone Health
Digestive Health

Score 85

Three useful magnesium forms provide balanced absorption and a solid 300 mg amount. The blend is versatile but comparatively expensive and lacks a named chelation standard.
How scoring works
$34.99($0.58 per serving)
iHerb
$ 34.99
Pure Formulas
$ 34.99
Walmart
$ 34.99
Report prices

Analysis

The 300 mg serving combines citrate, glycinate, and malate rather than relying on one magnesium salt. Those organic forms offer generally good absorption potential, while 50 mg spinach adds little to the core mineral dose.

Broad magnesium coverage supports general health, energy metabolism, stress response, and cardiovascular function. The blend is less convincing for highly specific goals because it supplies no targeted cofactor and does not identify a patented chelation process.

Two capsules per serving is manageable, and the 60-serving supply supports regular use. Cost per serving is higher than many magnesium products, so the multi-form design needs to matter to the buyer.

Who is it for
  • Adults comfortable with capsules
  • Users seeking broad magnesium support
  • People who can account for dietary and supplemental magnesium
Best for
  • Routine magnesium supplementation
  • Muscle, nerve, and energy support
  • Capsules dosing

Pros

  • Combines citrate, glycinate, and malate
  • Clearly discloses 300 mg elemental magnesium
  • Dose fits common supplemental use
  • Sixty-serving supply

Cons

  • Serving cost is above the category midpoint
  • No named chelation standard
  • Spinach adds little at 50 mg
  • Requires two capsules per serving

Warnings

  • The 300 mg magnesium serving may cause loose stools, especially in sensitive users
  • Impaired kidney function can reduce magnesium clearance, making this amount unsuitable without clinical guidance
  • Magnesium can reduce absorption of tetracycline or quinolone antibiotics and bisphosphonates when taken too close together

Nutrient quality

94 Highest impact

The principal magnesium forms have favorable absorption potential. The formula contains little apparent low-value padding.

Ingredient transparency

74 High impact

No broad blend hides the core amount, though complex naming reduces clarity. A complete inactive ingredient list is not supplied.

Customer satisfaction

93 Highest impact

The aggregate customer rating is exceptionally strong. Specific experiences are absent, but the strong aggregate rating is broadly consistent with satisfaction.

Value for money

82 Highest impact

The price is supported mainly by useful core ingredients. The supply provides reasonable value per meaningful serving.

Report analysis

Goals

General Health
Stress Resilience
General Health
Impact
Highest effect
A+ Goal FitA+ Strength of SupportB CoverageA+ Formula Quality
Magnesium · 300 mg

A substantial magnesium amount from citrate, glycinate, and malate supports muscle, nerve, energy, and stress-response functions. All three forms have useful absorption potential and fit a focused foundational-mineral strategy.

The total elemental amount is clear, although the proportions supplied by each form are not. Spinach is present at a small amount and adds little beyond the well-developed magnesium core.

Study evidence
Magnesium Supportive 114 studies
Stress Relief
Calm and Tension Relief
Stress Relief
Impact
Highest effect
A Goal FitA+ Strength of SupportC CoverageA Formula Quality
Magnesium · 300 mg

Magnesium provides direct nervous-system and muscle support at a substantial daily amount. Its role in correcting inadequate magnesium intake is well established, though direct stress-relief effects vary by baseline status.

Citrate, glycinate, and malate are all useful supplemental forms with clear disclosure. The added spinach is minor and does little to broaden stress-modulating support.

Study evidence
Magnesium Supportive 13 studies
Heart Health
Healthy Blood Pressure
Heart Health
Impact
Highest effect
A Goal FitA+ Strength of SupportC CoverageA Formula Quality
Magnesium · 300 mg

Magnesium supports normal vascular tone, cardiac rhythm, and cellular energy at a substantial daily amount. Its cardiovascular role is well established, especially when intake is inadequate.

Citrate, glycinate, and malate are all useful supplemental forms with clear disclosure. The added spinach is minor and does little to broaden cardiovascular coverage.

Study evidence
Magnesium Supportive 158 studies
Energy
Energy
Impact
Highest effect
A- Goal FitA Strength of SupportC- CoverageA Formula Quality
Magnesium · 300 mg

Magnesium directly supports ATP-dependent enzymes, and the 300 mg amount reaches the preferred range. Citrate, glycinate, and malate provide several generally well-absorbed forms.

The formula does not address alertness or stress resilience beyond correcting low magnesium intake. Spinach is present at a small amount and adds little to the mineral’s effect.

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

A blend of magnesium citrate, glycinate, and malate supports vascular tone and normal cardiac electrical function. The formula remains focused on one foundational pathway rather than comprehensive cardiovascular coverage.

The clearly stated elemental amount is substantial and the forms generally have good absorption potential. Spinach is present only in a small supporting amount, while the magnesium blend is coherent and free of poorly absorbed oxide.

Study evidence
Magnesium Supportive 123 studies
Testosterone Support
Free Testosterone Support
Testosterone Support
Impact
High effect
C Goal FitA- Strength of SupportD+ CoverageA Formula Quality
Magnesium · 300 mg

Magnesium provides focused nutritional support for normal endocrine function and possible free-hormone availability. The single-mineral strategy is useful when magnesium is needed but does not offer comprehensive testosterone support.

The elemental amount is substantial and citrate, glycinate, and malate are generally suitable forms. Clear disclosure and limited extras give this magnesium pathway good practical depth.

Study evidence
Magnesium Disputed 5 studies

Ingredients

IngredientAmount per serving
Magnesium (Magnesium Citrate, Magnesium Glycinate, Magnesium Malate)
 300 mg
Spinach
50 mg
Gluten Free Adults 18–50 Dairy Free Vegetarian
Report overview
Magnesium (Magnesium Citrate, Magnesium Glycinate, Magnesium Malate) · 300 mg OverallScore71
C Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyD+ Value

Citrate, glycinate, and malate provide a well-aligned blend with generally good absorption potential. The elemental amount is clear, but no patented chelation standard or targeted uptake co-factor is disclosed. The above-median serving cost is only partly justified by the multi-form blend.

View ingredientView products
Loading alternative details
85 Performance

Cal/Mag 500 mg/250 mg

NaturesPlus
A more purposeful active profile is better aligned with the original’s main use because chelated calcium and magnesium provide a focused, balanced mineral formula with strong form quality. A simple one-serving format and economical cost make it one of the better value profiles in this set.
85 Performance

Magnesium Bisglycinate 200 mg

Natural Factors
A more purposeful active profile is better aligned with the original’s main use because a focused magnesium bisglycinate powder uses a highly absorbable form at a moderate, practical amount. Strong aggregate satisfaction and reasonable serving economics support value without an aggressive dose.
85 Performance

Magnesium Bisglycinate Chelate

Healthy Origins
A more purposeful active profile is better aligned with the original’s main use because tRAACS magnesium bisglycinate provides premium absorption quality, a useful elemental amount, and exceptional serving value in a clean powder. The product is narrow rather than comprehensive, and its relatively weak satisfaction metric deserves consideration despite the strong formula.
83 Budget

Magnesium Citrate Pure Powder

Best Naturals
Lower serving cost makes it the more economical option, while a well-aligned amount of magnesium citrate delivers useful absorption in a focused powder. The simple formula and very low serving cost provide strong value, with digestive tolerance as the main practical uncertainty.
91 Budget

Krebs Magnesium Potassium Complex

Nature's Way
Lower serving cost makes it the more economical option, while magnesium lysinate and malate provide favorable forms at a useful amount, with a modest potassium contribution. The focused formula offers excellent serving value.
88 Budget

Magnesium Bisglycinate Powder

NOW
Lower serving cost makes it the more economical option, while magnesium bisglycinate supplies a well-absorbed form at a practical, moderate amount. The pure powder is adjustable, clearly labeled, and inexpensive, supporting strong routine value.
84 Value

Potassium + Magnesium

Nutricost
Ingredient quality and serving value are better balanced here because a meaningful magnesium citrate amount anchors a simple two-mineral electrolyte formula. Potassium is modest, but the focused design and very low serving cost support excellent everyday value.
83 Value

Magnesium Citrate 200 mg

Best Naturals
Ingredient quality and serving value are better balanced here because a substantial amount of magnesium citrate combines useful absorption with a focused single-active design. Digestive sensitivity is the main trade-off, while the low serving cost supports strong practical value.
80 Value

Magnesium Caps 500 mg

Life Extension
Ingredient quality and serving value are better balanced here because citrate, succinate, and a named glycinate chelate strengthen a multi-form magnesium blend, while oxide lowers average absorption. The large supplemental amount may cause diarrhea or cramping, although the very low serving cost provides strong value for users who tolerate it.
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Sources

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

  1. 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
  2. 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
  3. 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
  4. Red blood cell magnesium and chronic fatigue syndrome.
    Cox IM; Campbell MJ; Dowson D · Lancet (London, England) · 1991
    Randomized trial32 participantsEnergy forMagnesium
  5. Exercise, magnesium and immune function.
    Laires MJ; Monteiro C · Magnesium research · 2008
    Narrative reviewEnergy forMagnesium
  6. 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
  7. 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
  8. Effects of zinc and magnesium supplements on postpartum depression and anxiety: A randomized controlled clinical trial.
    Fard FE; Mirghafourvand M; Mohammad-Alizadeh Charandabi S; Farshbaf-Khalili A; Javadzadeh Y; Asgharian H · Women & health · 2017
    Randomized trial99 participantsStress Relief forMagnesium
  9. 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
  10. 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
  11. Effects of long-term magnesium supplementation on endothelial function and cardiometabolic risk markers: A randomized controlled trial in overweight/obese adults.
    Joris PJ; Plat J; Bakker SJ; Mensink RP · Scientific reports · 2018
    Randomized trial52 participantsCardiovascular Support forMagnesium
  12. Serum magnesium and outcomes in heart failure with reduced ejection fraction: the GALACTIC-HF trial.
    Chimura M; Docherty KF; Jhund PS; Yang M; Ono R; Henderson AD; Metra M; Liu G; Divanji PH; Heitner SB; Kupfer S; Malik FI; Felker GM; Solomon SD; Teerlink JR; McMurray JJV · European heart journal · 2026
    Randomized trial6,147 participantsCardiovascular Support forMagnesium
  13. 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
  14. 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
  15. Diagnosis of magnesium-induced diarrhea.
    Fine KD; Santa Ana CA; Fordtran JS · The New England journal of medicine · 1991
    Clinical trial19 participantsDigestive Health forMagnesium
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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