Major Oyster Shell Calcium + Vitamin D 500mg Tablets supplement bottle
Major

Oyster Shell Calcium + Vitamin D 500mg Tablets

What We Researched
2 active ingredients analyzed · 17 inactive ingredients decoded · 1 retailer compared · Last updated: Mar 2026
62
Product Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D (as Cholecalciferol) 5.0 mcg (200 IU) 25%
Calcium (as Oyster Shell) 500.0 mg 38%
Bioavailability Excellent

Absorption Rating

  • Vitamin D (as Cholecalciferol) Good
  • Calcium (as Oyster Shell) Good
Other Ingredients Very Poor

Fillers & Additives

  • Acacia
  • Maltodextrin
  • Croscarmellose Sodium
  • Microcrystalline Cellulose
  • Hypromellose
  • Polydextrose
  • Titanium Dioxide High
  • Soy Polysaccharide
  • Sodium Lauryl Sulfate Low
  • Talc High
  • Starch
  • Triglycerides
  • Sucrose
  • Fd&c Blue #1 Lake High
  • Fd&c Yellow #5 Lake High
  • Sodium Ascorbate
  • Silicon Dioxide And Tocopherols
Efficacy Fair

Dosage Analysis

  • Vitamin D (as Cholecalciferol) 5.0 mcg (200 IU) Under-dosed
  • Calcium (as Oyster Shell) 500.0 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D (as Cholecalciferol) 5.0 mcg (200 IU) 25%
Calcium (as Oyster Shell) 500.0 mg 38%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Acacia Generally_safe

It is used as a binder or thickener.

Maltodextrin Generally_safe

Helps carry and stabilize active ingredients. Provides bulk.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Microcrystalline Cellulose Safe

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

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Polydextrose Generally_safe

It is used as a filler, to add bulk, and as a prebiotic fiber.

Titanium Dioxide Caution

Used as a whitening agent in tablet coatings and capsules.

Soy Polysaccharide Unknown
Sodium Lauryl Sulfate Caution

It is used to help mix oil and water-based ingredients.

Talc Avoid

It is used to improve powder flow and prevent clumping.

Starch Generally_safe

It is used as a filler, binder, or thickener.

Triglycerides Generally_safe

They may be used as a carrier or to improve absorption of fat-soluble ingredients.

Sucrose Generally_safe

It is used as a sweetener.

Fd&c Blue #1 Lake Unknown
Fd&c Yellow #5 Lake Unknown
Sodium Ascorbate Safe

It helps to stabilize the pH and prevent oxidation.

Silicon Dioxide And Tocopherols Unknown

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$21$20$19$18$17 $19.11
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
Major

· 135 products

Transparency

1 claim
Related Supplements
Frequently Asked Questions
Is Major Oyster Shell Calcium + Vitamin D 500mg Tablets a good supplement?

Major Oyster Shell Calcium + Vitamin D 500mg Tablets received a product quality score of 62/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 2 active ingredients with 300 servings per container. Of the 17 inactive ingredients, 4 are rated safe and 2 are flagged for review.

What are the ingredients in Major Oyster Shell Calcium + Vitamin D 500mg Tablets?

Major Oyster Shell Calcium + Vitamin D 500mg Tablets contains 2 active ingredients: Vitamin D (as Cholecalciferol) (5.0 mcg (200 IU)), Calcium (as Oyster Shell) (500.0 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Major Oyster Shell Calcium + Vitamin D 500mg Tablets safe to take?

Major Oyster Shell Calcium + Vitamin D 500mg Tablets has been analyzed for ingredient safety across all its components. Of 17 inactive ingredients, 4 are rated safe. 2 ingredients are flagged for review: Titanium Dioxide, Sodium Lauryl Sulfate. '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.

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.