GNC Calcium 600 + Vitamin D-3 supplement bottle
GNC

Calcium 600 + Vitamin D-3

What We Researched
2 active ingredients analyzed · 18 inactive ingredients decoded · 5 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
62
Product Score Fair
88
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D (as Cholecalciferol) 10 mcg 50%
Calcium (as Calcium Carbonate) 600 mg 46%
Bioavailability Very Good

Absorption Rating

  • Vitamin D (as Cholecalciferol) Good
  • Calcium (as Calcium Carbonate) Fair
Other Ingredients Fair

Fillers & Additives

  • Microcrystalline Cellulose
  • Maltodextrin
  • Hydroxypropyl Cellulose
  • Titanium Dioxide High
  • Croscarmellose Sodium
  • Magnesium Stearate
  • Silicon Dioxide
  • Polyethylene Glycol Low
  • Sucrose
  • Polysorbate 80 Medium
  • Corn Starch
  • Gum Arabic
  • Glycerides
  • Tricalcium Phosphate
  • DL-Alpha Tocopherol
  • FD&C Yellow #6 Low
  • Aluminum Lake
  • Hydroxypropyl Methylcellulose
Efficacy Fair

Dosage Analysis

  • Vitamin D (as Cholecalciferol) 10 mcg Under-dosed
  • Calcium (as Calcium Carbonate) 600 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D (as Cholecalciferol) 10 mcg 50%
Calcium (as Calcium Carbonate) 600 mg 46%

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.

Maltodextrin Generally_safe

Helps carry and stabilize active ingredients. Provides bulk.

Hydroxypropyl Cellulose Safe

Binds tablet ingredients and can form tablet coatings.

Titanium Dioxide Caution

Used as a whitening agent in tablet coatings 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.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Polyethylene Glycol Caution

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

Sucrose Generally_safe

It is used as a sweetener.

Polysorbate 80 Caution

Helps mix oil and water-based ingredients.

Corn Starch Generally_safe

It is used as a filler, binder, or thickener.

Gum Arabic Safe

It is used as a thickener, binder, or emulsifier.

Glycerides Unknown
Tricalcium Phosphate Safe

Prevents clumping and provides supplemental calcium.

DL-Alpha Tocopherol Unknown
FD&C Yellow #6 Caution

It is used to add color to the supplement.

Aluminum Lake Unknown
Hydroxypropyl Methylcellulose Safe

It is used as a coating for tablets and capsules.

Price Comparison

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 Calcium 600 + Vitamin D-3 a good supplement?

GNC Calcium 600 + Vitamin D-3 received a product quality score of 62/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 2 active ingredients with 225 servings per container. Of the 18 inactive ingredients, 8 are rated safe and 4 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 Calcium 600 + Vitamin D-3?

GNC Calcium 600 + Vitamin D-3 contains 2 active ingredients: Vitamin D (as Cholecalciferol) (10 mcg), Calcium (as Calcium Carbonate) (600 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is GNC Calcium 600 + Vitamin D-3 safe to take?

GNC Calcium 600 + Vitamin D-3 has been analyzed for ingredient safety across all its components. Of 18 inactive ingredients, 8 are rated safe. 4 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.