SPECIMEN #SPRING-V
Verified
MineralsSpring Valley
Magnesium 400mg
400mg looks impressive until you learn magnesium oxide absorbs at about 4%. That's roughly 16mg of actual magnesium. A banana gives you 32mg. Magnesium oxide is primarily a laxative, not a mineral supplement. Pay $2 more for glycinate.
4.0/10
POORMagnesium oxide absorbs at approximately 4%, meaning 400mg delivers roughly 16mg of actual usable magnesium. While the label dose appears to hit the 400mg optimal, the oxide form makes this essentially a laxative rather than a mineral supplement. Glycinate, citrate, or malate forms absorb at 30-80%. For the same price you can get absorbable forms. This is the classic example of where form quality matters more than dose on the label.
1 ingredientTablets100 servings
Evidence
7.0
Dosing
10.0
SynergyN/A (single ingredient)
What We Like
- 100 tablets for under $4.
- 400mg on the label looks impressive.
- Works well as an osmotic laxative.
Watch Out For
- Magnesium oxide has ~4% bioavailability.
- 400mg oxide delivers roughly 16mg actual magnesium.
- Causes diarrhea at this dose.
- Your body absorbs more magnesium from a banana.
What We Analyzed
Verified Supplement Facts
Every dose checked against clinical research
We analyzed the actual supplement facts panel for this product. Every ingredient dose below was cross-referenced with published clinical trials to determine if it matches what studies actually use.
1 ingredients analyzed1 at clinical doses
Source: Official product page
Ingredient Breakdown
1 clinical
Clinical Adequate Underdosed Overdosed|Bar = % of clinical dose
IngredientDoseStatusvs. Clinical
In our database (click to learn more) Not yet reviewed
Our Analysis
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