Reliable 1 Laboratories Magnesium Oxide 400 mg supplement bottle
Reliable 1 Laboratories

Magnesium Oxide 400 mg

What We Researched
1 active ingredient analyzed · 6 inactive ingredients decoded · 2 retailers compared · Last updated: Mar 2026
75
Product Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Magnesium (as Magnesium Oxide) 240 mg 60%
Bioavailability Very Poor

Absorption Rating

  • Magnesium (as Magnesium Oxide) Poor
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Stearic Acid
  • pregelatinized Corn Starch
  • Croscarmellose Sodium
  • Sodium Starch Glycolate
  • Magnesium Stearate
Efficacy Excellent

Dosage Analysis

  • Magnesium (as Magnesium Oxide) 240 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Magnesium (as Magnesium Oxide) 240 mg 60%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

pregelatinized Corn Starch Unknown
Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Sodium Starch Glycolate Safe

Helps tablets break apart quickly for faster absorption.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$12$11$10$9$8 $10.24
Target

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Brand Trust Report
Reliable 1 Laboratories

· 7 products

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Frequently Asked Questions
Is Reliable 1 Laboratories Magnesium Oxide 400 mg a good supplement?

Reliable 1 Laboratories Magnesium Oxide 400 mg received a product quality score of 75/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 1 active ingredients Of the 6 inactive ingredients, 5 are rated safe and 0 are flagged for review.

What are the ingredients in Reliable 1 Laboratories Magnesium Oxide 400 mg?

Reliable 1 Laboratories Magnesium Oxide 400 mg contains 1 active ingredients: Magnesium (as Magnesium Oxide) (240 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Reliable 1 Laboratories Magnesium Oxide 400 mg safe to take?

Reliable 1 Laboratories Magnesium Oxide 400 mg 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.

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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.