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#14 in Minerals Third-Party Tested
Nature Made Magnesium Oxide 400mg (150 Softgels)
by Nature Made
"USP-verified magnesium at $0.07/day — America's most trusted supplement brand"
Amazon Rating
4.7/5
Reviews
42,600+
Price Range
$8-12
Servings
150 servings
USP VerifiedNon-GMO
Our Editorial Rating
8.2
Very Good
Overview
Nature Made Magnesium Oxide 400mg is one of the best-selling magnesium supplements in America, backed by USP verification and 42,600+ reviews. While magnesium oxide has lower bioavailability than glycinate or citrate forms, it provides the highest elemental magnesium per capsule (400mg = 95% DV) at the lowest cost. The USP verification ensures potency, purity, and proper dissolution.
Key Ingredients
| Ingredient | Amount |
|---|---|
| Magnesium (as Magnesium Oxide) | 400 mg (95% DV) |
Pros & Cons
What We Like
- USP Verified quality assurance
- 42,600+ reviews, 4.7 stars
- 150 softgels = 5-month supply
- $0.07/day — unbeatable value
- 400mg elemental magnesium per softgel
What Could Be Better
- Oxide form has lower bioavailability (~4%)
- May cause loose stools
- Not ideal for sleep or anxiety
- Less absorbed than glycinate/citrate
Who Is This For?
Best For
- Budget magnesium supplementation
- General magnesium deficiency
- Those wanting USP verification
- Value-first shoppers
Not Ideal For
- Those seeking sleep/relaxation benefits
- GI-sensitive individuals
- Those wanting high bioavailability
Our Verdict
8.2/10 — Very Good
The value king of magnesium. While oxide isn't the most bioavailable form, USP verification at $0.07/day makes this the rational choice for basic magnesium supplementation.
Alternatives to Consider
No direct alternatives listed for this product yet.