Core Nutritionals Calcium Magnesium Citrate supplement bottle
Core Nutritionals

Calcium Magnesium Citrate Review

What We Researched
2 active ingredients analyzed · 6 inactive ingredients decoded · 1 brand certification checked · Page generated: Sep 2026
96
Product Score Excellent
72
Brand Score Fair

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium (as Calcium Citrate) 1000 mg 77%
Magnesium (as Magnesium Citrate, Magnesium Oxide) 500 mg 119%
Bioavailability Excellent

Absorption Rating

  • Calcium (as Calcium Citrate) Good
  • Magnesium (as Magnesium Citrate, Magnesium Oxide) Good
Other Ingredients Excellent

Fillers & Additives

  • Stearic Acid
  • Microcrystalline Cellulose
  • Croscarmellose Sodium
  • Silicon Dioxide
  • Magnesium Stearate
  • Vegetable Protein
Efficacy Very Good

Dosage Analysis

  • Calcium (as Calcium Citrate) 1000 mg Effective
  • Magnesium (as Magnesium Citrate, Magnesium Oxide) 500 mg High

Supplement Facts

Ingredient Amount % Daily Value
Calcium (as Calcium Citrate) 1000 mg 77%
Magnesium (as Magnesium Citrate, Magnesium Oxide) 500 mg 119%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Microcrystalline Cellulose Safe

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

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Vegetable Protein Unknown
Brand Trust Report
Core Nutritionals

Founded 2005 · Statesville, North Carolina, United States · 288 products · corenutritionals.com/

Certifications

1 certification
Informed Sport Supporting evidence unavailable

Transparency

3 claims
Third Party Testing Claim — Claimed Evidence available Evidence
Testing Lab Disclosure — True Brand claim; evidence unavailable

Violation History

4 incidents
Prop 65 Lead, Cadmium2021-05-07 Source available Primary source
Prop 65 Lead2017-09-29 Source available Primary source
Lawsuit Protein spiking and false advertising of protein content in 'Core 8' protein powder.2017 Source available Primary source
Fda Warning Details of the specific violations are not available in the closeout letter.2015-04-24 Source available Primary source
Related Supplements
Frequently Asked Questions
Is Core Nutritionals Calcium Magnesium Citrate a good supplement?

Core Nutritionals Calcium Magnesium Citrate received a product quality score of 96/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 2 active ingredients with 50 servings per container. Of the 6 inactive ingredients, 5 are rated safe and 0 ingredients are flagged for review. The manufacturer, Core Nutritionals, holds a brand trust score of 72/100.

What are the ingredients in Core Nutritionals Calcium Magnesium Citrate?

Core Nutritionals Calcium Magnesium Citrate contains 2 active ingredients: Calcium (as Calcium Citrate) (1000 mg), Magnesium (as Magnesium Citrate, Magnesium Oxide) (500 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Core Nutritionals Calcium Magnesium Citrate safe to take?

GoodSupp reviewed the inactive-ingredient data available for Core Nutritionals Calcium Magnesium Citrate. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Core Nutritionals a trustworthy supplement brand?

Core Nutritionals receives a brand trust score of 72/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 2005 and headquartered in Statesville, North Carolina, United States, the company offers 288 products in their lineup. Note: Core Nutritionals has 4 historical regulatory incidents on record, which are factored into the trust score.

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 150,000 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 150,000 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 — read our methodology. 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.