BioStacks
GNC

Potassium & Magnesium Aspartate 250 mg

1 Capsule · 120 servings · $0.17/serving

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Ingredients (3)

Magnesium Aspartate

100%

Dose

250 mg

Target

100–400 mg

Form

Budget

Potassium

58%

Dose

57 mg

Target

99–500 mg

Form

—

Magnesium

20 mg

Trace amount — not scored

Other Ingredients (6)

Magnesium StearateLubricant

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

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Dicalcium PhosphateBinder

Calcium and phosphorus compound used as binder

GelatinCapsule

Protein derived from collagen, used in traditional capsule shells

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

The Magnesium in it is what pulls this toward the evening. Take it with food — the potassium in it is what makes this kind of product feel nauseating on an empty stomach.

With food
Space it a couple of hours from Iron and Calcium

On the label

As a dietary supplement, take one capsule with a meal.

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

Price Check

$19.99

$10$20$50

Near the median of 574 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. clinical 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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