NOW Foods Calcium Citrate, 100 Tablets supplement bottle
NOW Foods

Calcium Citrate, 100 Tablets

What We Researched
6 active ingredients analyzed · 5 inactive ingredients decoded · 7 brand certifications checked · 4 retailers compared · Last updated: Mar 2026
89
Product Score Good
100
Brand Score Excellent

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D2(as Ergocalciferol - a vegetarian source) (400 IU) 10 mcg 50%
Calcium (from Calcium Citrate) 600 mg 46%
Magnesium(from Magnesium Oxide and Magnesium Aspartate) 300 mg 71%
Zinc (from Zinc AAC*) 15 mg 136%
Copper (from Copper AAC*) 1 mg 111%
Manganese (from Manganese AAC*) 5 mg 217%
Bioavailability Very Good

Absorption Rating

  • Vitamin D2(as Ergocalciferol - a vegetarian source) (400 IU) Fair
  • Calcium (from Calcium Citrate) Good
  • Magnesium(from Magnesium Oxide and Magnesium Aspartate) Good
  • Zinc (from Zinc AAC*) Fair
  • Copper (from Copper AAC*) Fair
  • Manganese (from Manganese AAC*) Good
Other Ingredients Excellent

Fillers & Additives

  • Hydroxypropyl Cellulose
  • Vegetarian Coating
  • Croscarmellose Sodium
  • Silicon Dioxide
  • Magnesium stearate (vegetable source) and stearic acid (vegetable source)
Efficacy Very Good

Dosage Analysis

  • Vitamin D2(as Ergocalciferol - a vegetarian source) (400 IU) 10 mcg Under-dosed
  • Calcium (from Calcium Citrate) 600 mg Effective
  • Magnesium(from Magnesium Oxide and Magnesium Aspartate) 300 mg Effective
  • Zinc (from Zinc AAC*) 15 mg Effective
  • Copper (from Copper AAC*) 1 mg Effective
  • Manganese (from Manganese AAC*) 5 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D2(as Ergocalciferol - a vegetarian source) (400 IU) 10 mcg 50%
Calcium (from Calcium Citrate) 600 mg 46%
Magnesium(from Magnesium Oxide and Magnesium Aspartate) 300 mg 71%
Zinc (from Zinc AAC*) 15 mg 136%
Copper (from Copper AAC*) 1 mg 111%
Manganese (from Manganese AAC*) 5 mg 217%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Hydroxypropyl Cellulose Safe

Binds tablet ingredients and can form tablet coatings.

Vegetarian Coating Generally_safe

It is added to coat tablets or capsules.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Magnesium stearate (vegetable source) and stearic acid (vegetable source) Unknown

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$14$13$12$11$9 Mar 12 $12.24$11.39
iHerb
Vitacost

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

Brand Trust Report
NOW Foods

Founded 1968 · Bloomingdale, Illinois, USA · 996 products · nowfoods.com

Certifications

7 certifications
Consumerlab Verified Source
Informed Sport Verified Source
Labdoor Verified Source
Non Gmo Project Verified Source
Npa Gmp Verified Source
Usda Organic Verified Source
Fda Gmp Inspections Verified Source

Transparency

5 claims
Third Party Testing Claim — Verified Source
Coa Availability — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

7 incidents
Lawsuit Mislabeled St. John's Wort supplement, containing significantly less of the active ingredient than advertised.NoneSource
Lawsuit A data breach that compromised personal and health information of employees and dependents.2023Source
Prop 65 Lead2021-11-30Source
Recall NOW Real Food® Raw Macadamia Nuts2020-06-12Source
Recall NOW Real Food® Zesty Sprouting Mix2018-06-21Source
Lawsuit Misleadingly using slack-fill packaging for their Vitamin C supplements.2015Source
Fda Warning Adulterated Dietary Supplement due to pesticide (quintozene) contamination in American Ginseng.2007-10-12Source
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Frequently Asked Questions
Is NOW Foods Calcium Citrate, 100 Tablets a good supplement?

NOW Foods Calcium Citrate, 100 Tablets received a product quality score of 89/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 6 active ingredients with 50 servings per container. Of the 5 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, NOW Foods, holds a brand trust score of 100/100 with 7 verified certifications including Consumerlab, Informed Sport, Labdoor, Non Gmo Project.

What are the ingredients in NOW Foods Calcium Citrate, 100 Tablets?

NOW Foods Calcium Citrate, 100 Tablets contains 6 active ingredients: Vitamin D2(as Ergocalciferol - a vegetarian source) (400 IU) (10 mcg), Calcium (from Calcium Citrate) (600 mg), Magnesium(from Magnesium Oxide and Magnesium Aspartate) (300 mg), Zinc (from Zinc AAC*) (15 mg), Copper (from Copper AAC*) (1 mg), Manganese (from Manganese AAC*) (5 mg). Notable high-dose ingredients include Manganese at 217% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is NOW Foods Calcium Citrate, 100 Tablets safe to take?

NOW Foods Calcium Citrate, 100 Tablets 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 NOW Foods a trustworthy supplement brand?

NOW Foods receives a brand trust score of 100/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1968 and headquartered in Bloomingdale, Illinois, USA, the company offers 996 products in their lineup. They hold 7 verified certifications including Consumerlab, Informed Sport, Labdoor, Non Gmo Project. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: NOW Foods 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.