Vitamin D is critical for calcium uptake into bone. There is growing evidence that vitamin D may also reduce the risk of multiple sclerosis, depression, obesity, arthritis, cardiovascular disease, and upper respiratory infection.
Supplements providing vitamin D often include calcium, vitamin K and other ingredients. But ConsumerLab.com found in its evaluations of vitamin D supplements that some combination products were short on ingredient. Tests found one vitamin D supplement to provide only 67.2% of its vitamin K and only 89.2% of its calcium. Another vitamin D supplement we reviewed contained only 63.4% of its vitamin K.
In our vitamin D review, ConsumerLab.com also noted a confusing range of suggested daily dosing across brands -- ranging from 100 IU of vitamin D to 5,000 IU -- a 50-fold dosage range from one vitamin D brand to another!
You must subscribe to get the full test results for our vitamin D review and ConsumerLab recommendations, ratings and brand comparisons. In this comprehensive report, you'll discover:
- Which vitamin D products failed testing and which passed -- including vitamin D-only supplements and combinations with calcium and/or vitamin K
- Important differences between supplements with vitamin D2 and vitamin D3
- Recommendations on dosage for specific uses of vitamin D
- Concerns and cautions when using vitamin D supplements
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See additional reports on Calcium Supplements and Vitamin K Supplements.
