BioStacks
Best Naturals

Magnesium Oxide 500 mg

1 Tablet × 2/day · 180 servings · $0.06/serving

iHerbAmazon

Best for

Heart

Ingredients (1)

Magnesium

100%

Dose/day

1000 mg

Target

100–400 mg

Form

Budget

Other Ingredients (7)

ShellacCoating

Natural resin secreted by the lac bug, used as a coating and glazing agent for tablets and pills

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Magnesium StearateLubricant

A salt of stearic acid used as a lubricant in tablet and capsule production

Croscarmellose SodiumDisintegrant

Cross-linked cellulose derivative used as a superdisintegrant

Dicalcium PhosphateBinder

Calcium and phosphorus compound used as binder

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

Stearic AcidLubricant

Saturated fatty acid used as tablet lubricant

How to Take It

Best taken in the evening

Magnesium oxide is poorly absorbed (~4%) and the most laxative form. Most of a dose stays in the gut, which is why it's mainly used for constipation — a poor pick if you're supplementing for magnesium itself.

With or without food
Space it a couple of hours from Iron and Calcium
Label directs 2 servings — keep one for the evening

On the label

As a dietary supplement, take one (1) tablet two times daily with food or as directed by your qualified healthcare professional. Consider taking these other Best Naturals products Calcium, Vitamin D and Zinc.

General guidance based on the ingredients, not a substitute for the label or your doctor.

Price Check

$9.99

$10$20$50

Cheaper than 93% of 579 magnesium supplements

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. studied ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

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