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Magnesium Oxide 500 mg

Best Naturals
4.6
★ ★ ★ ★ ★
(113 ratings)
Magnesium 500 mg
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Score85

A cost-efficient, 6-month supply of high-dose magnesium oxide for gut and bone support.

How scoring works
Quantity:180 Tablet(s) • (180 servings)
Goals:
Digestive Health
General Health
Heart Health
Cardiovascular Support
Testosterone Support

Score 85

A cost-efficient, 6-month supply of high-dose magnesium oxide for gut and bone support.

How scoring works
$9.93($0.05 per serving)
iHerb
$ 11.99
Vitacost
$ 9.93
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Analysis

This supplement provides 500 mg of magnesium oxide per tablet. This form is known for having a very high elemental weight, which is useful for filling general mineral gaps and supporting bowel health.

While it may not be the first choice for brain health or sleep, it is a very effective and low-cost tool for managing regularity. The 180-tablet count offers a full six-month supply at a very low daily cost.

Pros

  • Very high elemental magnesium
  • Excellent 180-day supply
  • Supports digestive regularity
  • Budget-friendly pricing

Cons

  • Low systemic bioavailability
  • Tablets can be quite large
  • Risk of loose stools

Warnings

  • Take with meals for best tolerance
  • Do not use if you have kidney disease

Nutrient quality

69 High impact

Magnesium oxide provides high elemental weight but limited systemic bioavailability for metabolic processes. While the 500mg dose is significant, it is prone to causing loose stools before systemic repletion is achieved.

Ingredient transparency

95 Highest impact

Labeling clearly identifies the mineral form and provides the specific amount of elemental magnesium per tablet. Disclosure is adequate and follows standard industry practices for consumer information.

Customer satisfaction

88 Highest impact

Strong ratings over a moderate review volume suggest reliable performance for general mineral needs. Feedback indicates that the product is well-received for its cost-effectiveness and simple efficacy.

Value for money

89 Highest impact

Extremely low cost per serving makes this one of the most accessible mineral supplements available. Affordability provides significant value for budget-conscious consumers seeking basic mineral support.

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Goals

Impact
Highest effect
A Goal FitA- Strength of SupportC CoverageA+ Formula Quality

Best Naturals Magnesium Oxide 500mg delivers a significant dose of elemental magnesium aimed at supporting intestinal motility. This inorganic form is well-established for its role in stool softening and addressing occasional constipation.

The high concentration of magnesium oxide appears well aligned for individuals requiring mechanical support for regularity. This mineral may contribute to more consistent bowel movements through its osmotic effect in the intestines.

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Impact
High effect
A+ Goal FitB- Strength of SupportD CoverageA Formula Quality

Magnesium oxide at a high 500 mg dose provides foundational mineral support for daily metabolic function. While this form is cost-effective, it has limited systemic bioavailability compared to organic chelates.

A simple approach addresses essential mineral gaps, though digestive tolerance may vary.

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Impact
High effect
B+ Goal FitC Strength of SupportC- CoverageA- Formula Quality

Magnesium Oxide 500 mg provides a high elemental dose of this foundational mineral for heart rhythm and vascular tone. Magnesium is essential for the relaxation of blood vessels and may contribute to healthy blood pressure levels.

While the dose is robust, magnesium oxide is known for its lower systemic bioavailability compared to chelated forms. This supplement is an economical option for basic mineral support, although its impact on systemic magnesium levels may be limited.

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Impact
High effect
A- Goal FitC+ Strength of SupportF CoverageA- Formula Quality

Magnesium is a fundamental mineral for cardiovascular health, supporting normal heart rhythm and vascular tone. This supplement provides a high dose of magnesium oxide, which is relevant for foundational mineral maintenance.

While the 500 mg dose is significant, the oxide form is known for having poor systemic bioavailability compared to organic chelates. It serves as a simple mineral source but may be less effective for those with specific cardiovascular support needs compared to more absorbable forms.

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Impact
High effect
B Goal FitC Strength of SupportD CoverageA- Formula Quality

Magnesium Oxide is provided in this simple formula to support free testosterone by potentially inhibiting SHBG binding. It serves as a foundational mineral building block for overall metabolic and endocrine health.

The 500mg dose is robust, but the oxide form is recognized for its lower systemic bioavailability compared to organic mineral salts. This supplement is a pure mineral product that focuses on one pathway but lacks the breadth of a comprehensive endocrine support complex.

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Impact
Moderate effect
C+ Goal FitD+ Strength of SupportD- CoverageB- Formula Quality

Magnesium is a mandatory cofactor for the production of ATP, making its presence essential for all cellular energy-demanding processes. However, the use of the oxide form is associated with poor systemic absorption, which may limit its effectiveness for replenishing internal mineral stores.

While the dose is significant, the primary effect of this specific form often relates to digestive transit rather than systemic metabolic support. This choice of ingredient prioritizes cost and elemental weight over physiological bioavailability.

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Ingredients

IngredientAmount per serving
Magnesium (Magnesium Oxide)
500 mg
Gluten Free Adults 18–50 Sugar Free
Report overview
F Active Ingredient Quality & BioavailabilityC+ Dose, Safety & Label TransparencyD+ Value
This magnesium oxide supplement offers a high dose of the mineral at a very low cost. However, its low bioavailability makes it more effective as a laxative than for addressing a systemic magnesium deficiency.
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