Major Pharmaceuticals Oyster Shell Calcium 500 mg supplement bottle
Major Pharmaceuticals

Oyster Shell Calcium 500 mg

What We Researched
1 active ingredient analyzed · 14 inactive ingredients decoded · 2 retailers compared · Last updated: Mar 2026
62
Product Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium (as Calcium Carbonate, Oyster) 500 mg 50%
Bioavailability Fair

Absorption Rating

  • Calcium (as Calcium Carbonate, Oyster) Fair
Other Ingredients Very Poor

Fillers & Additives

  • Microcrystalline Cellulose
  • Acacia
  • Maltodextrin
  • Croscarmellose Sodium
  • Hypromellose
  • Titanium Dioxide High
  • Soy Polysaccharides
  • Sodium Lauryl Sulfate Low
  • Talc High
  • Triacetin
  • Stearic Acid
  • Mineral Oil Medium
  • Riboflavin
  • FD&C Blue No. 1 Lake High
Efficacy Excellent

Dosage Analysis

  • Calcium (as Calcium Carbonate, Oyster) 500 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Calcium (as Calcium Carbonate, Oyster) 500 mg 50%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

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

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.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

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.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Mineral Oil Caution

It is used as a lubricant or emollient.

Riboflavin Safe

It is used as a source of vitamin B2.

FD&C Blue No. 1 Lake Unknown

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$15$14$13$12$11 $12.57
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 Pharmaceuticals

Founded 1982 · Livonia, MI, United States · 18 products · major-rugby.com/

Transparency

1 claim

Violation History

9 incidents
Recall ChlorproMAZINE Hydrochloride Tablets, USP, 25mg/50mg/100mg/200mg2025-09-16Source
Recall Gabapentin 100MG CAPSULES2025-06-17Source
Lawsuit Violation of the California Invasion of Privacy Act (CIPA) through website tracking technology.2024Source
Recall Polyvinyl Alcohol, 1.4% Lubricating Eye Drops and Lubricating Tears Eye Drops (Dextran/Hypromellose, 0.1%/0.3%)2023-10-31Source
Recall Dronabinol Capsules, USP, 2.5 mg and Ziprasidone Hydrochloride Capsules, 20 mg2023-06-23Source
Lawsuit Parent company Cardinal Health, along with other distributors, was involved in lawsuits alleging their role in fueling the opioid crisis.2022Source
Recall Valsartan2018-07-13Source
Recall All liquid products manufactured by PharmaTech LLC and distributed by Major Pharmaceuticals and Rugby Laboratories2017-08-10Source
Lawsuit Parent company Cardinal Health agreed to a $44 million settlement for alleged violations of the Controlled Substances Act by failing to report suspicious orders of controlled substances.2016Source
Related Supplements
Frequently Asked Questions
Is Major Pharmaceuticals Oyster Shell Calcium 500 mg a good supplement?

Major Pharmaceuticals Oyster Shell Calcium 500 mg received a product quality score of 62/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 1 active ingredients Of the 14 inactive ingredients, 5 are rated safe and 3 are flagged for review.

What are the ingredients in Major Pharmaceuticals Oyster Shell Calcium 500 mg?

Major Pharmaceuticals Oyster Shell Calcium 500 mg contains 1 active ingredients: Calcium (as Calcium Carbonate, Oyster) (500 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Major Pharmaceuticals Oyster Shell Calcium 500 mg safe to take?

Major Pharmaceuticals Oyster Shell Calcium 500 mg has been analyzed for ingredient safety across all its components. Of 14 inactive ingredients, 5 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.

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.