Dr. Mercola Calcium, 120 Capsules (300 mg per Capsule) supplement bottle
Dr. Mercola

Calcium, 120 Capsules (300 mg per Capsule)

What We Researched
1 active ingredient analyzed · 6 inactive ingredients decoded · 4 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
75
Product Score Fair
81
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium (from OrganicAlgae Lithothamnion sp.) 300 mg 23%
Bioavailability Excellent

Absorption Rating

  • Calcium (from OrganicAlgae Lithothamnion sp.) Good
Other Ingredients Excellent

Fillers & Additives

  • Organic Capsule (Organic Pullulan)
  • Organic Oat Fiber
  • Organic Pea Starch
  • Organic medium chain triglycerides
  • Organic bamboo extract
  • Organic Sunflower Lecithin
Efficacy Very Poor

Dosage Analysis

  • Calcium (from OrganicAlgae Lithothamnion sp.) 300 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Calcium (from OrganicAlgae Lithothamnion sp.) 300 mg 23%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Organic Capsule (Organic Pullulan) Safe

It is used to encapsulate the supplement ingredients.

Organic Oat Fiber Safe

It is used as a filler to add bulk and fiber content.

Organic Pea Starch Safe

It is used as a filler or binder.

Organic medium chain triglycerides Unknown
Organic bamboo extract Unknown
Organic Sunflower Lecithin Generally_safe

It is used as an emulsifier.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$32$31$30$29$28 Mar 12 $29.70
iHerb

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

Brand Trust Report
Dr. Mercola

Founded 1997 · Cape Coral, Florida, USA · 209 products · mercola.com/

Certifications

4 certifications
Consumerlab Verified Source
Nsf Gmp Verified Source
Usda Organic Verified Source
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Verified Source

Violation History

7 incidents
Prop 65 Lead2025-04-18Source
Lawsuit Wrongful termination and breach of a severance contract by the former CEO.2024Source
Fda Warning Unapproved and misbranded products related to Coronavirus Disease 2019 (COVID-19).2021-02-18Source
Lawsuit False and unsupported claims that its indoor tanning systems are safe and do not increase the risk of skin cancer.2016Source
Fda Warning Illegal marketing of a medical device.2011-01-01Source
Fda Warning Illegal drug claims for various supplements.2006-01-01Source
Fda Warning Illegal drug claims for various supplements.2005-01-01Source
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Frequently Asked Questions
Is Dr. Mercola Calcium, 120 Capsules (300 mg per Capsule) a good supplement?

Dr. Mercola Calcium, 120 Capsules (300 mg per Capsule) received a product quality score of 75/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 1 active ingredients with 30 servings per container. Of the 6 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, Dr. Mercola, holds a brand trust score of 81/100 with 4 verified certifications including Consumerlab, Nsf Gmp, Usda Organic, Fda Gmp Inspections.

What are the ingredients in Dr. Mercola Calcium, 120 Capsules (300 mg per Capsule)?

Dr. Mercola Calcium, 120 Capsules (300 mg per Capsule) contains 1 active ingredients: Calcium (from OrganicAlgae Lithothamnion sp.) (300 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Dr. Mercola Calcium, 120 Capsules (300 mg per Capsule) safe to take?

Dr. Mercola Calcium, 120 Capsules (300 mg per Capsule) has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Dr. Mercola a trustworthy supplement brand?

Dr. Mercola receives a brand trust score of 81/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1997 and headquartered in Cape Coral, Florida, USA, the company offers 209 products in their lineup. They hold 4 verified certifications including Consumerlab, Nsf Gmp, Usda Organic, Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Dr. Mercola has 7 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 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.