You're getting 400mg of **Magnesium** per tablet — right at the top of the clinical supplemental range (100–400mg) — through a five-form blend of citrate, glycinate, malate, taurinate, and succinate. That's a full therapeutic dose in a single tablet for supporting sleep quality, muscle recovery, stress response, and energy production.

The formula also includes 30mg of **Vitamin B6**, which sits comfortably within its clinical range (25–100mg). This pairing is deliberate — B6 helps your body absorb magnesium and transport it into cells more effectively, so the two work together rather than just sharing a tablet.

The one tradeoff: the B6 uses pyridoxine, which your body has to convert before it can use it. At 30mg that's well below the 100mg threshold where pyridoxine can cause nerve issues, but if you're already taking a B-complex, keep an eye on your total B6 intake across products.

BioStacks
Source Naturals

Ultra-Mag™

2 Tablets · 120 servings

iHerbAmazon
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What it does

A combination of 2 label ingredients.

Vitamin B6

pyridoxineBudget

Supports normal protein metabolism, neurotransmitter production and hemoglobin formation.

Magnesium

Mixed formsGrade —

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

SleepStress & MoodEnergy
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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

Gum AcaciaBinder

Natural plant gum (acacia) used as a binder, stabilizer, and emulsifier in foods and supplements

Hydroxypropyl CelluloseBinder

An inert modified-cellulose polymer used as a binder, film-former, and disintegrant.

Microcrystalline CelluloseBinder

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

Stearic AcidLubricant

Saturated fatty acid used as tablet lubricant

Lab testing

How to take it

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

On the label

1 or 2 tablets daily with a meal.

Price check

$27.99

$10$20$50

Pricier than 86% of 89 vitamin B6 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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