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 · $0.23/serving

65 / 100Good

Score Breakdown

Formulation
75
Safety
85
Final score
65/100

Ingredients (2)

MagnesiumSynergy420 mg

Optimal dose · Premium form

Vitamin B-6Synergy30 mg

Within effective range · Budget form

Other Ingredients

Fillers, coatings, and additives

6Safe

Silicon DioxideAnti-caking

Safe

Magnesium StearateLubricant

Safe

Gum AcaciaBinder

Safe

Microcrystalline CelluloseBinder

Safe

Microcrystalline CelluloseBinder

Safe

Stearic AcidLubricant

Safe

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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.