Kirkman Labs Calcium Powder Plus Vitamin D-3, Unflavored, 16 oz (454 g) supplement bottle
Kirkman Labs

Calcium Powder Plus Vitamin D-3, Unflavored, 16 oz (454 g)

What We Researched
3 active ingredients analyzed · 1 brand certification checked · 3 retailers compared · Last updated: Mar 2026
79
Product Score Fair
81
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Each Serving Contains Amount Per Serving %Daily Value
Vitamin D-3 (as Cholecalciferol) (175 IU) 4.4 mcg 22%
Calcium (from Calcium Carbonate & Citrate) 1,000 mg 77%
Bioavailability Good

Absorption Rating

  • Each Serving Contains Fair
  • Vitamin D-3 (as Cholecalciferol) (175 IU) Good
  • Calcium (from Calcium Carbonate & Citrate) Fair
Other Ingredients Excellent

Fillers & Additives

No inactive ingredient data available.

Efficacy Fair

Dosage Analysis

  • Vitamin D-3 (as Cholecalciferol) (175 IU) 4.4 mcg Under-dosed
  • Calcium (from Calcium Carbonate & Citrate) 1,000 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Each Serving Contains Amount Per Serving %Daily Value
Vitamin D-3 (as Cholecalciferol) (175 IU) 4.4 mcg 22%
Calcium (from Calcium Carbonate & Citrate) 1,000 mg 77%

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$34$32$32$30$30 Mar 12 $31.50
iHerb

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

Brand Trust Report
Kirkman Labs

Founded 1949 · Lake Oswego, Oregon, U.S. · 74 products · kirkmangroup.com

Certifications

1 certification
Fda Gmp Inspections Verified Source

Transparency

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

Violation History

1 incident
Fda Warning Marketing unapproved new drugs and misbranded drugs (sodium fluoride products).2016-01-13Source
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Frequently Asked Questions
Is Kirkman Labs Calcium Powder Plus Vitamin D-3, Unflavored a good supplement?

Kirkman Labs Calcium Powder Plus Vitamin D-3, Unflavored, 16 oz (454 g) received a product quality score of 79/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 3 active ingredients with 151 servings per container. The manufacturer, Kirkman Labs, holds a brand trust score of 81/100 with 1 verified certifications including Fda Gmp Inspections.

What are the ingredients in Kirkman Labs Calcium Powder Plus Vitamin D-3, Unflavored?

Kirkman Labs Calcium Powder Plus Vitamin D-3, Unflavored contains 3 active ingredients: Each Serving Contains (Amount Per Serving), Vitamin D-3 (as Cholecalciferol) (175 IU) (4.4 mcg), Calcium (from Calcium Carbonate & Citrate) (1,000 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Kirkman Labs Calcium Powder Plus Vitamin D-3, Unflavored safe to take?

Kirkman Labs Calcium Powder Plus Vitamin D-3, Unflavored, 16 oz (454 g) 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 Kirkman Labs a trustworthy supplement brand?

Kirkman Labs receives a brand trust score of 81/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1949 and headquartered in Lake Oswego, Oregon, U.S., the company offers 74 products in their lineup. They hold 1 verified certifications including Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Kirkman Labs has 1 historical regulatory incident 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.