Calcium is critical for building and maintaining strong bones. Used regularly with vitamin D, calcium supplements may protect against osteoporosis in postmenopausal women. And these benefits may be enhanced by vitamin K.
But ConsumerLab.com found that not all calcium supplements provide their listed ingredients. Testing found one supplement to contain just 87% of the calcium claimed on its label. Another supplement provided just 89.2% of the expected calcium and only 67.2% of its claimed vitamin K. A third calcium supplement had only 52.5% of its vitamin K -- despite claiming to be lab tested and of guaranteed for labeled potency.
You must subscribe to get the full test results and ConsumerLab recommendations. In this comprehensive report, you'll discover:
- Which products failed testing and which passed
- The pros and cons of different forms of calcium such as carbonate, citrate, oyster shell, and coral calcium
- Dosage for specific uses
- Concerns and cautions
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See additional reports on Vitamin D Supplements and Vitamin K Supplements.
