Magnesium Oxide
Magnesium Oxide
★Recommended cadence, based on dosage & bottle size
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- Item Form
- Capsule
- Primary Supplement Type
- Magnesium Oxide
- Flavor
- Unflavored
- Product Benefits
- Occasional Constipation, Heartburn Relief, Magnesium Support
- Diet Type
- Gluten Free, Vegan, Non-GMO
- Supplement Formulation
- Individual Supplement
- Best Taken
- With water, evening meal or bedtime for bowel support
- Manufactured In
- USA, GMP-certified facility
* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before use, especially if you are pregnant, nursing, taking medications, or have a medical condition.
Magnesium Oxide 500 mg -the highest elemental magnesium content per capsule of any magnesium form, with reliable osmotic bowel support and antacid action. Honest note: absorption is lower than citrate or glycinate, but that is exactly what makes it effective for the digestive system.
Why It Works
What Magnesium Oxide Does -and What It Does Not Do
Strong Osmotic Laxative Effect
Magnesium oxide's low absorption rate is not a bug -it is a feature for bowel support. The unabsorbed magnesium draws water into the colon, softening stool and stimulating bowel movement. This is the same mechanism as prescription magnesium-based laxatives, at a fraction of the cost.
Highest Elemental Magnesium per Capsule
Oxide provides approximately 60% elemental magnesium by weight -roughly 300 mg of elemental magnesium in a 500 mg capsule. Citrate provides 11%, glycinate around 14%. For sheer milligrams-per-dollar, oxide is unmatched.
Antacid Action for Occasional Heartburn
Magnesium oxide is alkaline and neutralizes stomach acid on contact, providing relief from occasional heartburn and acid indigestion. This dual action -laxative and antacid -makes it useful for digestive complaints beyond constipation alone.
Budget-Friendly Daily Magnesium
Not everyone needs premium-bioavailability magnesium forms. For people primarily seeking bowel support or affordable daily supplementation, oxide delivers effective results without the price premium of chelated forms.
Supports Basic Magnesium Functions
Even at 8–10% bioavailability, the 500 mg capsule delivers approximately 40–50 mg of absorbed elemental magnesium -a meaningful contribution toward the 310–420 mg daily requirement. It will not replicate the systemic benefits of glycinate, but it does contribute to the body's magnesium pool.
Muscle and Nerve Support
The absorbed fraction supports muscle contraction and relaxation, nerve signaling, and the enzymatic reactions that depend on magnesium. The effect is smaller per capsule than chelated forms, but consistent daily use maintains a measurable contribution to total magnesium status.
The Honest Comparison
High Elemental Content, Lower Absorption -Know What You Are Buying
Magnesium oxide has more elemental magnesium per capsule than any other common form, but the lowest absorption rate. Most of it stays in the gut -which is why it works well for constipation and heartburn. If your goal is systemic magnesium repletion for sleep, muscle recovery, or stress support, citrate or glycinate will serve you better. If your goal is affordable bowel support, oxide is the right choice.
8%
24%
64%
Elemental magnesium absorption rate
*Low absorption is intentional for bowel support use. Mg Oxide provides ~300 mg elemental Mg per 500 mg capsule -the highest per-capsule elemental content of any common form.
Your Journey
What to Expect Over 3 Months
Foundation
Month 1
In the first few days, most people notice improved bowel regularity. Magnesium oxide's osmotic effect works quickly -often within 6–12 hours of the first dose. If your primary goal is constipation relief, start with one capsule in the evening and assess the next morning.
Be aware that at higher doses, it can cause loose stools or urgency. Start low and adjust. This is not a sign the product is harmful -it is working as intended, just at a stronger effect level than you need.
Better Together
Combines Well With
Stack with these for a complete protocol, formulated to work synergistically.
Got Questions?
Frequently Asked Questions
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