Windmill Natural Vitamins Magnesium 400 mg supplement bottle
Windmill Natural Vitamins

Magnesium 400 mg

What We Researched
2 active ingredients analyzed · 11 inactive ingredients decoded · 2 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
40
Product Score Poor
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium (as Dicalcium Phosphate) 70 mg 5%
Magnesium (as Magnesium Carbonate, Magnesium Oxide) 400 mg 95%
Bioavailability Poor

Absorption Rating

  • Calcium (as Dicalcium Phosphate) Fair
  • Magnesium (as Magnesium Carbonate, Magnesium Oxide) Poor
Other Ingredients Poor

Fillers & Additives

  • Dicalcium Phosphate
  • Microcrystalline Cellulose
  • Stearic Acid
  • Croscarmellose Sodium
  • Magnesium Stearate
  • Silica
  • Hypromellose
  • Glycerin
  • Talc High
  • Carnauba Wax
  • Titanium Dioxide High
Efficacy Poor

Dosage Analysis

  • Calcium (as Dicalcium Phosphate) 70 mg Under-dosed
  • Magnesium (as Magnesium Carbonate, Magnesium Oxide) 400 mg High

Supplement Facts

Ingredient Amount % Daily Value
Calcium (as Dicalcium Phosphate) 70 mg 5%
Magnesium (as Magnesium Carbonate, Magnesium Oxide) 400 mg 95%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Dicalcium Phosphate Safe

Serves as both a filler and a supplemental source of calcium and phosphorus.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

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.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Glycerin Safe

Retains moisture and helps dissolve ingredients in softgels and liquids.

Talc Avoid

It is used to improve powder flow and prevent clumping.

Carnauba Wax Safe

Provides a glossy, protective coating on tablets.

Titanium Dioxide Caution

Used as a whitening agent in tablet coatings and capsules.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$15$14$13$12$11 $12.59
Target

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

Brand Trust Report
Windmill Natural Vitamins

Founded 1972 · West Caldwell, New Jersey, United States · 110 products · windmillvitamins.com/

Certifications

2 certifications
Non Gmo Project Verified Source
Usda Organic Verified Source

Transparency

3 claims
Third Party Testing Claim — Claimed Source
In House Testing — Verified Source

Violation History

4 incidents
Fda Warning Sale of unregistered drug products in the Philippines.2021-10-15Source
Prop 65 Lead and cadmium2018-03-20Source
Lawsuit Misleading packaging (slack-fill)2018Source
Lawsuit False and deceptive marketing of a weight-loss supplement (QuickTrim)2012Source
Related Supplements
Frequently Asked Questions
Is Windmill Natural Vitamins Magnesium 400 mg a good supplement?

Windmill Natural Vitamins Magnesium 400 mg received a product quality score of 40/100 in GoodSupp's independent analysis, indicating several areas of concern that consumers should review. The product contains 2 active ingredients with 50 servings per container. Of the 11 inactive ingredients, 9 are rated safe and 1 are flagged for review. The manufacturer, Windmill Natural Vitamins, holds a brand trust score of 66/100 with 2 verified certifications including Non Gmo Project, Usda Organic.

What are the ingredients in Windmill Natural Vitamins Magnesium 400 mg?

Windmill Natural Vitamins Magnesium 400 mg contains 2 active ingredients: Calcium (as Dicalcium Phosphate) (70 mg), Magnesium (as Magnesium Carbonate, Magnesium Oxide) (400 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Windmill Natural Vitamins Magnesium 400 mg safe to take?

Windmill Natural Vitamins Magnesium 400 mg has been analyzed for ingredient safety across all its components. Of 11 inactive ingredients, 9 are rated safe. 1 ingredient is flagged for review: Titanium Dioxide. '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 Windmill Natural Vitamins a trustworthy supplement brand?

Windmill Natural Vitamins receives a brand trust score of 66/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1972 and headquartered in West Caldwell, New Jersey, United States, the company offers 110 products in their lineup. They hold 2 verified certifications including Non Gmo Project, Usda Organic. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Windmill Natural Vitamins has 4 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.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

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.