Windmill Natural Vitamins Iron Sulfate supplement bottle
What We Researched
2 active ingredients analyzed · 10 inactive ingredients decoded · 2 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
71
Product Score Fair
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium (as Dicalcium Phosphate) 15 mg 1%
Iron (as Ferrous Sulfate) 65 mg 361%
Bioavailability Fair

Absorption Rating

  • Calcium (as Dicalcium Phosphate) Fair
  • Iron (as Ferrous Sulfate) Fair
Other Ingredients Excellent

Fillers & Additives

  • Dicalcium Phosphate
  • Stearic Acid
  • Microcrystalline Cellulose
  • Magnesium Stearate
  • Silica
  • Maltodextrin
  • Croscarmellose Sodium
  • Hypromellose
  • PEG-400
  • Methacrylic Acid Copolymer
Efficacy Poor

Dosage Analysis

  • Calcium (as Dicalcium Phosphate) 15 mg Under-dosed
  • Iron (as Ferrous Sulfate) 65 mg High

Supplement Facts

Ingredient Amount % Daily Value
Calcium (as Dicalcium Phosphate) 15 mg 1%
Iron (as Ferrous Sulfate) 65 mg 361%

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.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Microcrystalline Cellulose Safe

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

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Maltodextrin Generally_safe

Helps carry and stabilize active ingredients. Provides bulk.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

PEG-400 Unknown
Methacrylic Acid Copolymer Generally_safe

It is added to provide a protective coating or to control the release of ingredients.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$15$14$13$12$11 $13.13
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 Iron Sulfate a good supplement?

Windmill Natural Vitamins Iron Sulfate received a product quality score of 71/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 2 active ingredients with 100 servings per container. Of the 10 inactive ingredients, 7 are rated safe and 0 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 Iron Sulfate?

Windmill Natural Vitamins Iron Sulfate contains 2 active ingredients: Calcium (as Dicalcium Phosphate) (15 mg), Iron (as Ferrous Sulfate) (65 mg). Notable high-dose ingredients include Iron at 361% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Windmill Natural Vitamins Iron Sulfate safe to take?

Windmill Natural Vitamins Iron Sulfate 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 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.