Price History (90 days)
Quick Facts
- Form
- Softgels
- Dose
- 400mg
- Serving
- 1 softgel
- Servings
- 150
- Vegan
- No
- Made in
- USA
Nature Made Magnesium Oxide 400mg
by Nature Made
Nature Made Magnesium Oxide 400mg provides a high dose of magnesium at a budget-friendly price. Magnesium oxide has the highest elemental magnesium content by weight but the lowest bioavailability of all common forms — estimated at just 4-5% absorption. This means that of 400mg, your body may only absorb around 16-20mg. It remains popular due to its low cost and high label dose, but informed buyers generally prefer chelated forms.
AI Review Summary
Nature Made Magnesium Oxide is the budget option — cheap, high-dose on paper, but with the worst bioavailability of any magnesium form at roughly 4-5% absorption. The ingredient list includes titanium dioxide (banned in EU food since 2022), soy, and gelatin. It works as a laxative but is a poor choice for addressing magnesium deficiency or improving sleep, muscle function, or stress.
Pros
- +Very cheap — lowest cost per bottle
- +High label dose (400mg)
- +USP Verified for quality assurance
- +150 servings per bottle
Cons
- -Extremely poor bioavailability (4-5%)
- -Contains titanium dioxide (banned in EU food)
- -Significant GI side effects — laxative effect
Best For
Watch Out
- !4-5% absorption means you absorb only ~16-20mg of the 400mg dose
- !Contains titanium dioxide — banned in EU food products since 2022
Ingredients & Composition
Active Ingredients
- Magnesium (as Magnesium Oxide)
- 400mg (95% DV)
Other Ingredients
Soybean Oil, Gelatin, Glycerin, Soy Lecithin, Yellow Beeswax, Titanium Dioxide (colour)
Clean Label Analysis
Below average. Contains soy-based ingredients, gelatin (not vegan), and titanium dioxide — a colourant that is increasingly scrutinised and banned in food products in the EU since 2022.
Quality & Testing
Third-Party Tested
This product has been independently tested by third-party laboratories for purity, potency, and safety.
Certifications
Additional Specifications
- Type
- Mineral
- Form
- Softgels
- Dose
- 400mg
- Serving Size
- 1 softgel
- Fillers Analysis
- Below average. Contains soy-based ingredients, gelatin (not vegan), and titanium dioxide — a colourant that is increasingly scrutinised and banned in food products in the EU since 2022.
- Allergens
- Contains: soy, gelatin. Free from: dairy, gluten, artificial flavours
- Made In
- USA
How We Score Supplements
Our AI analyses reviews from Reddit, Amazon, YouTube, and specialist forums, then scores each product on a 1-10 scale across six evidence-based categories:
Effectiveness
How well the product delivers its claimed benefits, based on aggregated user experiences.
Ingredient Quality
Bioavailable forms, clean label, minimal fillers, no artificial junk. Higher = cleaner.
Value for Money
Price per serving relative to ingredient quality and effectiveness.
Side Effects Profile
Higher score = fewer side effects. 10 means virtually no adverse reactions reported.
Certifications & Testing
Third-party lab testing, GMP certification, and independent quality verification.
Overall Score
Weighted combination of all factors. Our bottom-line recommendation.
Disclaimer: AIScored provides AI-generated summaries based on publicly available reviews and product information. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Affiliate links may earn us a commission at no extra cost to you.