NOW Bone Calcium supplement bottle
NOW

Bone Calcium

What We Researched
8 active ingredients analyzed · 6 inactive ingredients decoded · 5 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
82
Product Score Good
89
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D3 (as Cholecalciferol) 400 IU 100%
Calcium (as Calcium Citrate, Calcium Hydroxyapatite) 500 mg 50%
Phosphorus (as Hydroxyapatite) 120 mg 12%
Magnesium (as Magnesium Oxide) 250 mg 63%
Zinc (as Zinc Bisglycinate) 7.5 mg 50%
Copper (as Copper Bisglycinate) 1 mg 50%
Manganese (as Manganese Bisglycinate) 2 mg 100%
Boron (as Boron Amino Acid Chelate) 0.7 mg
Bioavailability Very Good

Absorption Rating

  • Vitamin D3 (as Cholecalciferol) Good
  • Calcium (as Calcium Citrate, Calcium Hydroxyapatite) Good
  • Phosphorus (as Hydroxyapatite) Good
  • Magnesium (as Magnesium Oxide) Poor
  • Zinc (as Zinc Bisglycinate) Good
  • Copper (as Copper Bisglycinate) Good
  • Manganese (as Manganese Bisglycinate) Good
  • Boron (as Boron Amino Acid Chelate) Fair
Other Ingredients Excellent

Fillers & Additives

  • Cellulose
  • Stearic Acid
  • Croscarmellose Sodium
  • Magnesium Stearate
  • Silica
  • Vegetarian Coating
Efficacy Fair

Dosage Analysis

  • Vitamin D3 (as Cholecalciferol) 400 IU Under-dosed
  • Calcium (as Calcium Citrate, Calcium Hydroxyapatite) 500 mg Effective
  • Phosphorus (as Hydroxyapatite) 120 mg Under-dosed
  • Magnesium (as Magnesium Oxide) 250 mg Effective
  • Zinc (as Zinc Bisglycinate) 7.5 mg Under-dosed
  • Copper (as Copper Bisglycinate) 1 mg Effective
  • Manganese (as Manganese Bisglycinate) 2 mg Effective
  • Boron (as Boron Amino Acid Chelate) 0.7 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D3 (as Cholecalciferol) 400 IU 100%
Calcium (as Calcium Citrate, Calcium Hydroxyapatite) 500 mg 50%
Phosphorus (as Hydroxyapatite) 120 mg 12%
Magnesium (as Magnesium Oxide) 250 mg 63%
Zinc (as Zinc Bisglycinate) 7.5 mg 50%
Copper (as Copper Bisglycinate) 1 mg 50%
Manganese (as Manganese Bisglycinate) 2 mg 100%
Boron (as Boron Amino Acid Chelate) 0.7 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

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.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Vegetarian Coating Generally_safe

It is added to coat tablets or 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
NOW

Founded 1968 · Bloomingdale, Illinois, USA · 53 products · nowfoods.com

Certifications

5 certifications
Informed Sport Verified Source
Npa Gmp Verified Source
Fda Gmp Inspections Verified Source
Non Gmo Project Verified Source
Usda Organic Verified Source

Transparency

3 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Claimed
In House Testing — Verified Source
Related Supplements
Frequently Asked Questions
Is NOW Bone Calcium a good supplement?

NOW Bone Calcium received a product quality score of 82/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 8 active ingredients with 120 servings per container. Of the 6 inactive ingredients, 5 are rated safe and 0 are flagged for review. The manufacturer, NOW, holds a brand trust score of 89/100 with 5 verified certifications including Informed Sport, Npa Gmp, Fda Gmp Inspections, Non Gmo Project.

What are the ingredients in NOW Bone Calcium?

NOW Bone Calcium contains 8 active ingredients: Vitamin D3 (as Cholecalciferol) (400 IU), Calcium (as Calcium Citrate, Calcium Hydroxyapatite) (500 mg), Phosphorus (as Hydroxyapatite) (120 mg), Magnesium (as Magnesium Oxide) (250 mg), Zinc (as Zinc Bisglycinate) (7.5 mg), Copper (as Copper Bisglycinate) (1 mg), and 2 more. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is NOW Bone Calcium safe to take?

NOW Bone Calcium 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 a trustworthy supplement brand?

NOW receives a brand trust score of 89/100 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 53 products in their lineup. They hold 5 verified certifications including Informed Sport, Npa Gmp, Fda Gmp Inspections, Non Gmo Project. 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.