Take both capsules daily and you're getting 300mg of elemental **magnesium** — squarely within the 100–400mg supplemental range studied for sleep, muscle relaxation, and steady heart rhythm. The label's 833mg figure is the magnesium bisglycinate compound weight; the elemental magnesium your body counts is 150mg per capsule, so the twice-daily direction is what reaches a full dose.

Bisglycinate is the reason to reach for this one — magnesium bound to the amino acid glycine absorbs well and stays gentle on the gut, sidestepping the loose-stool effect magnesium can otherwise cause. That makes it easy to take every day, which matters more than chasing a bigger number.

The thing to watch is the per-capsule math. One capsule gives you 150mg, a reasonable top-up, but reaching the studied range for calm and muscle support means following the label's two-a-day.

BioStacks
NFH

Magnesium SAP

1 Capsule × 2/day · 90 servings

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What it does

Magnesium

magnesium bisglycinatePremium

Supports normal muscle and nerve function and helps the body produce energy.

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Ingredients (2)

Other ingredients

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

Purified WaterSolvent

Water meeting USP specifications used as solvent/vehicle in gummies and liquids

HypromelloseCapsule

Plant-derived capsule material from cellulose

Lab testing

How to take it

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

Adults Take 1 capsule twice daily or as directed by your healthcare practitioner.

Price check

$24.74

$0.27 / serving

$10$20$50

Near the median of 579 magnesium supplements

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the 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.

Not medical advice. Consult your healthcare professional.

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