Foster & Thrive Magnesium Oxide 400mg Tablets supplement bottle
Foster & Thrive

Magnesium Oxide 400mg Tablets

What We Researched
2 active ingredients analyzed · 8 inactive ingredients decoded · 1 retailer compared · Last updated: Mar 2026
84
Product Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium 130.0 mg 10%
Elemental Magnesium 483.0 mg 115%
Bioavailability Excellent

Absorption Rating

  • Calcium Good
  • Elemental Magnesium Good
Other Ingredients Excellent

Fillers & Additives

  • Cellulose
  • Stearic Acid
  • Croscarmellose Sodium
  • Kelp
  • Gum Acacia
  • Magnesium Silicate
  • Magnesium Stearate
  • Silicon Dioxide
Efficacy Poor

Dosage Analysis

  • Calcium 130.0 mg Under-dosed
  • Elemental Magnesium 483.0 mg High

Supplement Facts

Ingredient Amount % Daily Value
Calcium 130.0 mg 10%
Elemental Magnesium 483.0 mg 115%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Kelp Generally_safe

It is included as a source of iodine.

Gum Acacia Safe

It is used as a thickener, binder, or emulsifier.

Magnesium Silicate Generally_safe

It is used to improve powder flow and prevent clumping.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$13$12$11$10$9 $10.58
Target

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Related Supplements
Frequently Asked Questions
Is Foster & Thrive Magnesium Oxide 400mg Tablets a good supplement?

Foster & Thrive Magnesium Oxide 400mg Tablets received a product quality score of 84/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 2 active ingredients with 30 servings per container. Of the 8 inactive ingredients, 6 are rated safe and 0 are flagged for review.

What are the ingredients in Foster & Thrive Magnesium Oxide 400mg Tablets?

Foster & Thrive Magnesium Oxide 400mg Tablets contains 2 active ingredients: Calcium (130.0 mg), Elemental Magnesium (483.0 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Foster & Thrive Magnesium Oxide 400mg Tablets safe to take?

Foster & Thrive Magnesium Oxide 400mg Tablets has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

What is magnesium good for?

Magnesium Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding magnesium good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

How much magnesium per day?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

What is zinc good for?

Zinc Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding zinc good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.