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.

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BioStacks

Source Naturals

Ultra-Mag

Tablet · 60 servings · $0.24/serving

60 / 100Good

Score Breakdown

Formulation
68
Safety
85
Final score
60/100

Ingredients (2)

Magnesium400 mg

Exceeds UL · Standard form

Vitamin B630 mg

Within effective range · Budget form

Label Nutrition Facts

Nutrition

Calories and macros.

  • Calories10 Calorie(s)
  • Total Carbohydrates1 Gram(s)

Active Ingredients

From the label · % Daily Value

DV%

Vitamin B630 mg

2308%

Magnesium400 mg

200%

Sodium5 mg

Other Ingredients

Fillers, coatings, and additives

5Safe

Magnesium StearateLubricant

Safe

Silicon DioxideAnti-caking

Safe

Gum AcaciaBinder

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.