Major Oyster Shell Calcium 500 mg with Vitamin D supplement bottle
Major

Oyster Shell Calcium 500 mg with Vitamin D

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

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D3 (as Cholecalciferol) 200 IU 50%
Calcium (as Oyster) 500 mg 50%
Bioavailability Excellent

Absorption Rating

  • Vitamin D3 (as Cholecalciferol) Good
  • Calcium (as Oyster) Good
Other Ingredients Very Poor

Fillers & Additives

  • Croscarmellose Sodium
  • Hypromellose
  • Microcrystalline Cellulose
  • Titanium Dioxide High
  • Soy Polysaccharides
  • Sodium Lauryl Sulfate Low
  • Talc High
  • Triacetin
  • Mineral Oil Medium
  • Starch
  • Sucrose
  • FD&C Yellow #5 Lake High
  • FD&C Blue #1 Lake High
  • Sodium Ascorbate
  • Triglycerides
  • Silica
  • Tocopherols
Efficacy Fair

Dosage Analysis

  • Vitamin D3 (as Cholecalciferol) 200 IU Under-dosed
  • Calcium (as Oyster) 500 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D3 (as Cholecalciferol) 200 IU 50%
Calcium (as Oyster) 500 mg 50%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Microcrystalline Cellulose Safe

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

Titanium Dioxide Caution

Used as a whitening agent in tablet coatings and capsules.

Soy Polysaccharides 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.

Triacetin Generally_safe

It is used as a solvent or humectant.

Mineral Oil Caution

It is used as a lubricant or emollient.

Starch Generally_safe

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

Sucrose Generally_safe

It is used as a sweetener.

FD&C Yellow #5 Lake Unknown
FD&C Blue #1 Lake Unknown
Sodium Ascorbate Safe

It helps to stabilize the pH and prevent oxidation.

Triglycerides Generally_safe

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

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Tocopherols Safe

Prevents oxidation of oils and fats in supplements.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$11$10$9$8$7 $9.06
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 500 mg with Vitamin D a good supplement?

Major Oyster Shell Calcium 500 mg with Vitamin D 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 Of the 17 inactive ingredients, 6 are rated safe and 3 are flagged for review.

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

Major Oyster Shell Calcium 500 mg with Vitamin D contains 2 active ingredients: Vitamin D3 (as Cholecalciferol) (200 IU), Calcium (as Oyster) (500 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

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

Major Oyster Shell Calcium 500 mg with Vitamin D has been analyzed for ingredient safety across all its components. Of 17 inactive ingredients, 6 are rated safe. 3 ingredients are flagged for review: Titanium Dioxide, Sodium Lauryl Sulfate, Mineral Oil. '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.