GNC Super Magnesium 400 mg supplement bottle
GNC

Super Magnesium 400 mg

What We Researched
1 active ingredient analyzed · 12 inactive ingredients decoded · 5 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
76
Product Score Fair
88
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Magnesium (as Magnesium Aspartate, Magnesium Citrate, Magnesium Lactate) 400 mg 95%
Bioavailability Excellent

Absorption Rating

  • Magnesium (as Magnesium Aspartate, Magnesium Citrate, Magnesium Lactate) Good
Other Ingredients Fair

Fillers & Additives

  • Microcrystalline Cellulose
  • Hydroxypropylcellulose
  • Hydroxypropyl Methylcellulose
  • Croscarmellose Sodium
  • Magnesium Stearate
  • Crospovidone
  • Titanium Dioxide High
  • Silicon Dioxide
  • Vegetable Acetoglycerides
  • Polyethylene Glycol Low
  • Polysorbate 80 Medium
  • Carnauba Wax
Efficacy Very Good

Dosage Analysis

  • Magnesium (as Magnesium Aspartate, Magnesium Citrate, Magnesium Lactate) 400 mg High

Supplement Facts

Ingredient Amount % Daily Value
Magnesium (as Magnesium Aspartate, Magnesium Citrate, Magnesium Lactate) 400 mg 95%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Hydroxypropylcellulose Generally_safe

It is added to bind ingredients together and provide a smooth coating.

Hydroxypropyl Methylcellulose Safe

It is used as a coating for tablets and capsules.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Crospovidone Generally_safe

It is used as a binder to help tablets or capsules disintegrate.

Titanium Dioxide Caution

Used as a whitening agent in tablet coatings and capsules.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Vegetable Acetoglycerides Unknown
Polyethylene Glycol Caution

It is used as a binder, coating agent, or to improve solubility.

Polysorbate 80 Caution

Helps mix oil and water-based ingredients.

Carnauba Wax Safe

Provides a glossy, protective coating on tablets.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$22$21$20$19$18 Mar 12 $19.99
GNC

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
GNC

Founded 1935 · Pittsburgh, Pennsylvania, USA · 200 products · gnc.com

Certifications

5 certifications
Informed Sport Verified Source
Consumerlab Verified Source
Fda Gmp Inspections Verified Source
Usda Organic Verified Source
Vegan Certified Verified Source

Transparency

3 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Claimed
Related Supplements
Frequently Asked Questions
Is GNC Super Magnesium 400 mg a good supplement?

GNC Super Magnesium 400 mg received a product quality score of 76/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 1 active ingredients with 45 servings per container. Of the 12 inactive ingredients, 6 are rated safe and 3 are flagged for review. The manufacturer, GNC, holds a brand trust score of 88/100 with 5 verified certifications including Informed Sport, Consumerlab, Fda Gmp Inspections, Usda Organic.

What are the ingredients in GNC Super Magnesium 400 mg?

GNC Super Magnesium 400 mg contains 1 active ingredients: Magnesium (as Magnesium Aspartate, Magnesium Citrate, Magnesium Lactate) (400 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is GNC Super Magnesium 400 mg safe to take?

GNC Super Magnesium 400 mg has been analyzed for ingredient safety across all its components. Of 12 inactive ingredients, 6 are rated safe. 3 ingredients are flagged for review: Titanium Dioxide, Polyethylene Glycol, Polysorbate 80. 'Caution' doesn't mean dangerous — it indicates the ingredient has some considerations worth being aware of, such as potential sensitivities or ongoing research. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is GNC a trustworthy supplement brand?

GNC receives a brand trust score of 88/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1935 and headquartered in Pittsburgh, Pennsylvania, USA, the company offers 200 products in their lineup. They hold 5 verified certifications including Informed Sport, Consumerlab, Fda Gmp Inspections, Usda Organic. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. No regulatory violations or FDA warning letters were found in our research.

What is magnesium good for?

Magnesium Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding magnesium good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

How much magnesium per day?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

What is zinc good for?

Zinc Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding zinc good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.