NOW Cal-Mag, 100 Tablets supplement bottle
NOW

Cal-Mag, 100 Tablets

What We Researched
14 active ingredients analyzed · 5 inactive ingredients decoded · 5 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
87
Product Score Good
89
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin C (as Ascorbic Acid and Magnesium Ascorbate and Calcium Ascorbate) 360 mg 400%
Thiamine (Vitamin B-1) (from Thiamine HCl) 10 mg 833%
Riboflavin (Vitamin B-2) 5 mg 385%
Niacin (Vitamin B-3) (as Niacinamide) 40 mg 250%
Vitamin B6 (from Pyridoxine HCl) 5 mg 294%
Folate DEF(800 mcg Folic Acid) 1333 mcg 333%
Vitamin B12 (as Cyanocobalamin) 20 mcg 833%
Biotin 300 mcg 1000%
Pantothenic Acid (Vitamin B-5) (from Calcium Pantothenate) 20 mg 400%
Choline (as Choline Bitartrate) 20 mg 4%
Calcium (from Calcium Carbonate , Calcium Citrate, Calcium Ascorbate) (1000 mg) 1 g 77%
Magnesium (Magnesium Oxide, Magnesium Citrate, Magnesium Ascorbate) 500 mg 119%
Inositol 20 mg *
PABA 10 mg *
Bioavailability Very Good

Absorption Rating

  • Vitamin C (as Ascorbic Acid and Magnesium Ascorbate and Calcium Ascorbate) Good
  • Thiamine (Vitamin B-1) (from Thiamine HCl) Fair
  • Riboflavin (Vitamin B-2) Good
  • Niacin (Vitamin B-3) (as Niacinamide) Good
  • Vitamin B6 (from Pyridoxine HCl) Fair
  • Folate DEF(800 mcg Folic Acid) Fair
  • Vitamin B12 (as Cyanocobalamin) Fair
  • Biotin Good
  • Pantothenic Acid (Vitamin B-5) (from Calcium Pantothenate) Good
  • Choline (as Choline Bitartrate) Poor
  • Calcium (from Calcium Carbonate , Calcium Citrate, Calcium Ascorbate) (1000 mg) Fair
  • Magnesium (Magnesium Oxide, Magnesium Citrate, Magnesium Ascorbate) Good
  • Inositol Good
  • PABA Good
Other Ingredients Excellent

Fillers & Additives

  • Cellulose
  • Stearic Acid (Vegetable Source)
  • Croscarmellose Sodium
  • Silica
  • Magnesium stearate (vegetable source) and vegetable coating
Efficacy Good

Dosage Analysis

  • Vitamin C (as Ascorbic Acid and Magnesium Ascorbate and Calcium Ascorbate) 360 mg Effective
  • Thiamine (Vitamin B-1) (from Thiamine HCl) 10 mg Effective
  • Riboflavin (Vitamin B-2) 5 mg Effective
  • Niacin (Vitamin B-3) (as Niacinamide) 40 mg High
  • Vitamin B6 (from Pyridoxine HCl) 5 mg Effective
  • Folate DEF(800 mcg Folic Acid) 1333 mcg High
  • Vitamin B12 (as Cyanocobalamin) 20 mcg Effective
  • Biotin 300 mcg Effective
  • Pantothenic Acid (Vitamin B-5) (from Calcium Pantothenate) 20 mg Effective
  • Choline (as Choline Bitartrate) 20 mg Under-dosed
  • Calcium (from Calcium Carbonate , Calcium Citrate, Calcium Ascorbate) (1000 mg) 1 g Effective
  • Magnesium (Magnesium Oxide, Magnesium Citrate, Magnesium Ascorbate) 500 mg High
  • Inositol 20 mg Under-dosed
  • PABA 10 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin C (as Ascorbic Acid and Magnesium Ascorbate and Calcium Ascorbate) 360 mg 400%
Thiamine (Vitamin B-1) (from Thiamine HCl) 10 mg 833%
Riboflavin (Vitamin B-2) 5 mg 385%
Niacin (Vitamin B-3) (as Niacinamide) 40 mg 250%
Vitamin B6 (from Pyridoxine HCl) 5 mg 294%
Folate DEF(800 mcg Folic Acid) 1333 mcg 333%
Vitamin B12 (as Cyanocobalamin) 20 mcg 833%
Biotin 300 mcg 1000%
Pantothenic Acid (Vitamin B-5) (from Calcium Pantothenate) 20 mg 400%
Choline (as Choline Bitartrate) 20 mg 4%
Calcium (from Calcium Carbonate , Calcium Citrate, Calcium Ascorbate) (1000 mg) 1 g 77%
Magnesium (Magnesium Oxide, Magnesium Citrate, Magnesium Ascorbate) 500 mg 119%
Inositol 20 mg *
PABA 10 mg *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Stearic Acid (Vegetable Source) Generally_safe

It is used as a lubricant and release agent.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Magnesium stearate (vegetable source) and vegetable coating Unknown

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$13$12$11$10$9 Mar 12 $11.39
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

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 Cal-Mag, 100 Tablets a good supplement?

NOW Cal-Mag, 100 Tablets received a product quality score of 87/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 14 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, 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 Cal-Mag, 100 Tablets?

NOW Cal-Mag, 100 Tablets contains 14 active ingredients: Vitamin C (as Ascorbic Acid and Magnesium Ascorbate and Calcium Ascorbate) (360 mg), Thiamine (Vitamin B-1) (from Thiamine HCl) (10 mg), Riboflavin (Vitamin B-2) (5 mg), Niacin (Vitamin B-3) (as Niacinamide) (40 mg), Vitamin B6 (from Pyridoxine HCl) (5 mg), Folate DEF(800 mcg Folic Acid) (1333 mcg), and 8 more. Notable high-dose ingredients include Vitamin C at 400% DV, Thiamine at 833% DV, Riboflavin at 385% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is NOW Cal-Mag, 100 Tablets safe to take?

NOW Cal-Mag, 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 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.

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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.