calcium
Oyster Shell Calcium
Oyster Shell Calcium is a very natural source of calcium but has a low elemental percentage as well as low bioavailability. It is the same as Calcium Carbonate which is the most common and least expensive calcium supplement. Some manufactures claim oyster shell calcium is absorbed better than other forms of calcium carbonate, we have yet to find any study backing up this claim.
Elemental Percentage
40%
Bioavailability
15%
Our key metric
Price Per Absorbed Gram
This allows you to see what the true cost is for each gram of calcium that your body actually uses.
Featured Products
| Product Name | Form | Price Per Absorbed Gram | |
| 21st Century Calcium 500 mg Plus D3 Tablets, 400 Count | sd | 0.3330 | Buy Now |
| Oyster Shell Calcium Tablets, 500mg, 1000ct | Tablets | 0.3871 | Buy Now |
| Major Pharmaceuticals Oyster Shell Calcium with Vitamin D 500MG+D, 300 Count | Tablets | 0.5102 | Buy Now |
| Nature's Blend Oyster Shell Calcium with D3 200 Tabs | Tablets | 1.0853 | Buy Now |
| Nature's Blend Oyster Shell Calcium 500 mg 100 Tabs (1683) | Tablets | 1.0907 | Buy Now |
| KAL Calcium Oyster Shell Tablets, 600 mg, 100 Count | Tablets | 1.1100 | Buy Now |
| Calcium"600" (Oyster Shell Calcium) 120 Tabs 2-Pack | Tablets | 1.1796 | Buy Now |
Finding calcium supplements with high bioavailability and elemental percentage lowers the size and number of pills needed to meet the recommended daily allowance (RDA). When we consider what your body absorbs some of the more inexpensive supplements may not be the bargain they appear to be. While other supplements with higher prices may be absorbed much better allowing you take fewer (or smaller) pills.
Additionally, reviewing the possible side effects that may be heightened in one compound over another. Click on any of the compounds below to see the top-rated supplements within each compound.
Oyster Shell Calcium facts
- The chemical formula for calcium carbonate (which oyster shell calcium is) is CaCO3
- Is often used as an antacid
- Oyster shell calcium supplements have been known to contain levels of lead toxins.
- We have seen nothing to lead us to recommend oyster shell calcium over standard forms of calcium carbonate
Sources
- shells of oysters
Health Benefits
- development and maintenance of strong bones and teeth
- helps in the proper functioning of the heart, muscles, and nerves
- necessary for the blood clotting process
- studies have shown that a diet rich in calcium may be associated with lower body weight and a reduced risk of obesity
- calcium intake can help to prevent osteoporosis
Reactions with other Vitamins
- Vitamin D helps absorption
- Magnesium works with calcium – you need both
- Calcium can interfere with the absorption of iron and Zinc – take calcium and zinc or iron supplements at different times of the day
- may interact with blood pressure medications and blood thinners. It’s best to consult with a doctor before taking these medications and calcium supplements together.
Recommended Dietary Allowance
The Recommended Dietary Allowance (RDA) is “the amount of an essential nutrient, as a vitamin or mineral, that has been established by the Food and Nutrition Board of the National Academy of Sciences as adequate to meet the average daily nutritional needs of most healthy persons according to age group and sex.” –- dictionary.com
We used the RDA for calcium from the National Institutes of Health – Office of Dietary Supplements listed below.
|
Age |
Male Daily |
|
0-6 months |
200 mg |
|
7-12 months |
260 mg |
|
1-3 years |
700 mg |
|
4-8 years |
1000 mg |
|
9-18 years |
1300 mg |
|
19-50 years |
1000 mg |
|
51-70 years |
1000 mg |
|
71+ years |
1200 mg |
|
Age |
Female Daily |
|
0-6 months |
200 mg |
|
7-12 months |
260 mg |
|
1-3 years |
700 mg |
|
4-8 years |
1000 mg |
|
9-18 years |
1300 mg |
|
19-50 years |
1000 mg |
|
51+ years |
1200 mg |
| Life Stage | Age | RDA |
| Pregnancy | 13-19 years | 1300 mg |
| Pregnancy | 20+ years | 1000 mg |
| Breast-Feeding | 13-19 years | 1300 mg |
| Breast-Feeding | 20+ years | 1000 mg |