At 133mg per capsule, you'll need to follow the label's three-capsule-a-day recommendation to reach 399mg — right at the top of the clinically studied supplemental range (100–400mg). At that full dose, you're well-covered for **Magnesium's** broad benefits: energy production, muscle and nerve function, sleep quality, and stress resilience.

The form here is **TRAACS Magnesium Bisglycinate Chelate**, a well-absorbed chelated form that's gentle on your stomach — but it's labeled "buffered," meaning **Magnesium Oxide** is blended in to boost the elemental magnesium number. Oxide absorbs at roughly 4%, so a portion of each capsule isn't working as hard as the chelate. You're getting a mix of premium and budget forms in the same pill.

The main caveat is that three-capsule daily commitment. If you take just one capsule, 133mg is at the low end of the effective range, and part of that is coming from the poorly absorbed oxide fraction.

BioStacks
Swanson

Chelated Magnesium 133 mg

1 Capsule × 3/day · 90 servings · $0.08/serving

iHerbAmazon

Best for

Sleep

Ingredients (1)

Magnesium

100%

Dose/day

399 mg

Target

100–400 mg

Form

Premium

Other Ingredients (7)

MaltodextrinBinder

Spikes blood sugar faster than table sugar (glycemic index 85–105). Research links it to gut bacteria changes that may promote intestinal inflammation (Nickerson et al. 2015). Used as a cheap filler — adds nothing beneficial.

Magnesium OxideMineral Source

An inorganic magnesium salt used as a magnesium source or bulking mineral.

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

Citric AcidAcidulant

Natural acid derived from citrus fruits

GelatinCapsule

Protein derived from collagen, used in traditional capsule shells

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in 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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