Each capsule delivers 150mg of **Magnesium** in citrate form — a well-absorbed option that sits right at the bottom of the clinical supplemental range (100–400mg). At one capsule, you're getting a modest dose that covers basic maintenance, but the label suggests taking up to three daily. At two to three capsules (300–450mg), you'd land squarely in the range used in clinical research for sleep support, muscle relaxation, and stress reduction.

**Magnesium** deficiency is extremely common — estimated to affect over half the population — and blood tests often miss it because serum levels don't reflect what's stored inside your cells. The citrate form absorbs well and has a mild laxative effect, which can be a benefit or a drawback depending on your digestion.

The main consideration is that the supplemental upper limit for magnesium is 350mg, and three capsules would put you at 450mg. If you're taking two capsules daily, you're in a comfortable range for most of the health goals this product supports — from energy and heart rhythm to bone health.

BioStacks
Natural Factors

Magnesium Citrate 150 mg

1 Capsule · 90 servings · $0.12/serving

iHerbAmazon

Best for

Heart

Ingredients (1)

Magnesium

100%

Dose

150 mg

Target

100–400 mg

Form

Standard

Other Ingredients (3)

Magnesium StearateLubricant

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

GelatinCapsule

Protein derived from collagen, used in traditional capsule shells

Microcrystalline CelluloseBinder

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

How to Take It

Best taken in the evening

Magnesium citrate pulls water into the bowel — mildly laxative at higher doses. Evening suits that; split the dose or switch to glycinate if it's too much.

With or without food
Space it a couple of hours from Iron and Calcium

On the label

Suggested usage: 1 capsule 1–3 times per day or as directed by a health professional.

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

Price Check

$10.47

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Cheaper than 90% 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.

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