Your Cart is Empty
But it doesn't have to be.
Continue Shopping.
Added to Cart
Cart Total:
Customers Also Bought:

21st Century, Oyster Shell Calcium 500 + D3, 400 Tablets (Discontinued Item)


Out of Stock - Discontinued
  • Shipping Weight: 1.77 lbs (0.8 kg)
  • Product Code: CEN-22727
  • UPC Code: 740985227275
  • Package Quantity: 400 Tablets
  • Dimensions: 3.2 x 3.2 x 6.6 in, 1.5 lbs (0.68 kg)
Product Overview


  • Value Size
  • Dietary Supplement
  • Super Value
  • Extra Vitamin D††
  • Compare to Active Ingredients in Os Cal 500 +D

Regular exercise and a healthy diet with enough calcium helps teen and young adult Caucasian and Asian women maintain good bone health and may reduce their high risk of osteoporosis later in life. Adequate calcium intake is important, but daily intakes above about 2,000 mg are not likely to provide any additional benefit. Now with extra Vitamin D. Vitamin D is essential for use of calcium and necessary for healthy bones, teeth and cartilage.

††Compared to the original formula.

Suggested Use

As a dietary supplement, take two tablets daily with any meal, or as directed by your healthcare provider. Do not exceed recommended dosage.

Other Ingredients

Cellulose, croscarmellose sodium, polyvinyl alcohol, titanium dioxide, stearic acid, PEG, talc, magnesium stearate, artificial colors (FD&C Blue #1, FD&C Yellow #5). Contains a shellfish ingredient (oyster shell).

Unconditionally guaranteed for purity, freshness and label potency. No sugar, yeast, preservatives or artificial flavors.


Keep out of reach of children. Do not use if product appears to be tampered with or seal is broken. Store at room temperature.

Supplement Facts
Serving Size: 2 Tablets
Servings Per Container: 200
  Amount Per Serving % DV
Vitamin D3 (as Cholecalciferol) 800 IU 200%
Calcium (from Oyster Shell) 1000 mg 100%
Percent Daily Value (DV).
iHerb Customer Reviews


Posted by 5189039440256297142 on Dec 17, 2013

good price for such a number of tablets.

Verified Purchase

Was this review helpful to you?

Wonderful product.

Posted by 5192765826737489587 on Nov 20, 2013

For me it is the best product with calcium and D3.

Verified Purchase

Was this review helpful to you?

Balance of Calcium & Vit D

Posted by shawnlim88 on Sep 07, 2012

good balance of calcium & VitD

Verified Purchase

Was this review helpful to you?

Good for the price

Posted by 4993377861818758552 on Aug 16, 2012

It's good. But not easy to swallow.

Verified Purchase

Was this review helpful to you?


Posted by Reviewer2861513 on Feb 06, 2012

higher calcium, low unit price

Verified Purchase

Was this review helpful to you?