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Simag Marine Magnesium 200 mg

4.8
★ ★ ★ ★ ★
(99 ratings)
Magnesium 200 mg
Product Image
Score68
A convenient marine magnesium complex with a moderate amount, but unclear salt proportions and several basic forms limit quality confidence.
How scoring works
Capsule
Quantity:60 Capsule(s) • (60 servings)
Goals:
Stress Relief
General Health

Score 68

A convenient marine magnesium complex with a moderate amount, but unclear salt proportions and several basic forms limit quality confidence.
How scoring works
$11.09($0.18 per serving)
iHerb
$ 0.00
Walmart
$ 11.09
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Analysis

The product provides a moderate elemental amount from a marine mineral complex in one capsule. Chloride and sulfate add some form diversity beyond a basic oxide-only product.

Carbonate, hydroxide, and oxide are also included, and the label data repeats the total amount for every salt. Without proportions, the contribution from the more soluble forms cannot be assessed.

One-capsule use and a low-to-moderate cost are convenient. The product suits users interested in a marine source more than those seeking a clearly dominant glycinate or citrate form.

Who is it for
  • Adults interested in marine-source magnesium
  • Users seeking a moderate one-capsule amount
Best for
  • General magnesium maintenance
  • One-capsule convenience
  • Mixed mineral salts

Pros

  • Moderate elemental amount
  • One capsule per serving
  • Includes chloride and sulfate forms

Cons

  • Contains oxide, hydroxide, and carbonate
  • Form proportions are undisclosed
  • Repeated entries obscure the label

Warnings

  • Magnesium salts may cause loose stools or abdominal discomfort in sensitive users.

Nutrient quality

77 High impact

The moderate magnesium amount is useful, but carbonate, hydroxide, oxide, and sulfate dominate a weak form profile. Undisclosed proportions prevent the branded marine source from establishing clear absorption quality.

Ingredient transparency

57 Moderate impact

The total amount is clear and all forms are named. Their individual contributions, complete directions, and capsule excipients are not supplied.

Customer satisfaction

64 Moderate impact

The strong average rating and modest review count make the aggregate satisfaction signal encouraging but incomplete. No detailed review text was provided, so recurring complaints and purpose alignment cannot be assessed.

Value for money

75 High impact

A low serving cost and moderate amount provide basic value. Weak inorganic forms and unclear proportions keep the product from competing well for systemic magnesium support.

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Goals

Stress Relief
Stress Relief
Impact
High effect
B+ Goal FitC+ Strength of SupportD+ CoverageA- Formula Quality
Magnesium · 200 mg

Magnesium provides a direct foundation for nervous-system regulation and relaxation. The single-mineral formula is focused, but it does not include an adaptogen or inhibitory amino acid for broader stress support.

The amount reaches the minimum target, yet the blend relies on carbonate, hydroxide, oxide, sulfate, and other inorganic salts with weak systemic absorption. The named marine source does not establish validated uptake, leaving form quality as the main limitation.

Study evidence
Magnesium Supportive 13 studies
General Health
Stress Resilience
General Health
Impact
High effect
A- Goal FitC Strength of SupportD CoverageC- Formula Quality
Magnesium · 200 mg

Magnesium provides foundational support for energy metabolism, muscle function, and nerve signaling. The 200 mg serving is useful for routine supplementation.

Most listed forms are inorganic salts with weaker expected absorption, including oxide, carbonate, and hydroxide. Repeating several forms under one marine blend adds complexity without showing a clear functional advantage.

Study evidence
Magnesium Supportive 114 studies
Bone Health
Bone Health
Impact
Moderate effect
C+ Goal FitC- Strength of SupportD- CoverageA- Formula Quality
Magnesium · 200 mg

The magnesium amount can contribute to bone metabolism and vitamin D activation. A mixture of carbonate, hydroxide, oxide, sulfate, and chloride relies heavily on poorly absorbed inorganic salts despite the branded marine source.

The single-mineral design is transparent and free from unrelated ingredients, but form quality limits effective contribution. Calcium, vitamin D, vitamin K, and matrix support are absent.

Study evidence
Magnesium Supportive 48 studies
Energy
Energy
Impact
Moderate effect
B Goal FitC Strength of SupportD- CoverageC- Formula Quality
Magnesium · 200 mg

Magnesium supports ATP-dependent enzymes and normal energy metabolism. The mineral's foundational role is established, but the product's form profile limits expected delivery.

The 200 mg elemental amount meets the minimum targeted threshold. The blend relies heavily on carbonate, hydroxide, oxide, sulfate, and other inorganic salts with weak systemic absorption.

Study evidence
Magnesium Supportive 4 studies
Heart Health
Healthy Blood Pressure
Heart Health
Impact
Moderate effect
C Goal FitC- Strength of SupportD- CoverageC- Formula Quality
Magnesium · 200 mg

A 200 mg magnesium serving offers moderate support for vascular tone and normal cardiac signaling. The marine blend, however, relies on several forms with limited systemic absorption.

Elemental magnesium is stated, but the contribution of each source is unclear. Narrow pathway coverage and mixed form quality make this a basic rather than high-confidence heart option.

Study evidence
Magnesium Supportive 158 studies
Digestive Health
Digestive Health
Impact
Moderate effect
B- Goal FitC- Strength of SupportD- CoverageD Formula Quality
Magnesium · 200 mg

Several magnesium salts may support stool softening and intestinal muscle function, but the blend relies heavily on poorly absorbed inorganic forms. Evidence is stronger for citrate than for this mixed marine-mineral profile.

The 200 mg amount is useful, yet six overlapping source descriptions obscure how much each form contributes. Magnesium hydroxide and oxide may cause loose stools or cramping while offering limited systemic absorption.

Study evidence
Magnesium Supportive 50 studies
Cardiovascular Support
Cardiovascular Support
Impact
Moderate effect
C- Goal FitD Strength of SupportF CoverageC+ Formula Quality
Magnesium · 200 mg

Magnesium may support vascular relaxation and normal rhythm when intake is inadequate. The marine blend relies heavily on poorly absorbed inorganic salts, which weakens systemic usefulness.

The amount is clearly stated, but the branded source does not establish superior absorption. The formula remains narrow and lacks complementary cardiovascular actives.

Study evidence
Magnesium Supportive 123 studies

Ingredients

IngredientAmount per serving
Magnesium (Magnesium Carbonate, Magnesium Chloride, Magnesium Hydroxide, Magnesium Oxide, Magnesium Sulphate, Simag 45G Marine Magnesium)
 200 mg
Adults 18–50 Vegetarian
Report overview
Magnesium (Magnesium Carbonate, Magnesium Chloride, Magnesium Hydroxide, Magnesium Oxide, Magnesium Sulphate, Simag 45G Marine Magnesium) · 200 mg OverallScore50
F Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyD- Value

The 200 mg serving is clearly stated, but the blend relies on several poorly absorbed inorganic magnesium salts. A branded marine source is named without evidence of patented chelation or validated absorption. Low serving cost partly offsets the weak form quality, but systemic value remains limited.

View ingredientView products
Loading alternative details
81 Performance

Ultra-Mag

Source Naturals
<p>A broad organic magnesium blend supplies strong form diversity and a substantial amount at an economical cost. Compared with Simag Marine Magnesium 200 mg, its magnesium form and supporting ingredients may be a better fit where the label does not separate each form, making systemic absorption hard to predict, while the label does not clarify each form share, while high supplemental magnesium and prolonged B6 use may affect tolerability.</p>
85 Performance

Magnesium Bisglycinate Chelate

Healthy Origins
<p>TRAACS magnesium bisglycinate provides premium absorption quality, a useful elemental amount, and exceptional serving value in a clean powder. Compared with Simag Marine Magnesium 200 mg, its magnesium form and supporting ingredients may be a better fit where the label does not separate each form, making systemic absorption hard to predict, while the product is narrow rather than comprehensive, and its relatively weak satisfaction metric deserves consideration despite the strong formula.</p>
75 Performance

NeuroMag

Designs for Health
<p>Branded magnesium L-threonate provides a well-characterized specialty form at its typical elemental amount. Compared with Simag Marine Magnesium 200 mg, its magnesium form and supporting ingredients may be a better fit where the label does not separate each form, making systemic absorption hard to predict, while strong customer sentiment cannot fully offset a very high serving cost.</p>
80 Budget

Magnesium Caps 500 mg

Life Extension
<p>Citrate, succinate, and a named glycinate chelate strengthen a multi-form magnesium blend, while oxide lowers average absorption. Its lower recurring cost than Simag Marine Magnesium 200 mg makes it a more economical magnesium option, while the large supplemental amount may cause diarrhea or cramping, although the very low serving cost provides strong value for users who tolerate it.</p>
79 Budget

Target-Mins Magnesium Caps With Silica 300 mg

Country Life
<p>The mineral blend combines useful magnesium forms with oxide and a substantial horsetail-derived silica amount. Its lower recurring cost than Simag Marine Magnesium 200 mg makes it a more economical magnesium option, while strong customer sentiment and highly economical servings make the larger supply attractive.</p>
74 Budget

Magnesium 500 mg

Nature's Life
<p>Absorbable forms improve the blend, but magnesium oxide lowers its overall absorption quality. Its lower recurring cost than Simag Marine Magnesium 200 mg makes it a more economical magnesium option, while active doses are stated, while missing excipient and full use details limit transparency.</p>
84 Value

Magnesium Bisglycinate Chelate

Healthy Origins
<p>TRAACS magnesium bisglycinate provides premium absorption quality and a useful elemental amount in a clean tablet. Compared with Simag Marine Magnesium 200 mg, its magnesium profile offers a practical quality-to-cost trade-off despite no confirmed cost advantage, while the focused formula offers strong value but remains limited to one foundational mineral pathway.</p>
91 Value

Krebs Magnesium Potassium Complex

Nature's Way
<p>Magnesium lysinate and malate provide favorable forms at a useful amount, with a modest potassium contribution. Compared with Simag Marine Magnesium 200 mg, its magnesium profile offers a practical quality-to-cost trade-off despite no confirmed cost advantage, while the focused formula offers excellent serving value.</p>
88 Value

Magnesium Bisglycinate Powder

NOW
<p>Magnesium bisglycinate supplies a well-absorbed form at a practical, moderate amount. Compared with Simag Marine Magnesium 200 mg, its magnesium profile and lower recurring cost create a more favorable quality-to-cost balance, while no meaningful dose or formulation concern is evident from the supplied facts.</p>
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Sources

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

  1. 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
  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 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  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. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. Red blood cell magnesium and chronic fatigue syndrome.
    Cox IM; Campbell MJ; Dowson D · Lancet (London, England) · 1991
    Randomized trial32 participantsEnergy forMagnesium
  21. Exercise, magnesium and immune function.
    Laires MJ; Monteiro C · Magnesium research · 2008
    Narrative reviewEnergy forMagnesium
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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