Vitamin D plays a critical role in bone health, and adequate vitamin D levels in the blood are associated with reduced risk of heart attack, high blood pressure, depression, rheumatoid arthritis, asthma, allergy, and even colds. Adequate vitamin D has also been shown to strengthen muscles and reduce the risk of falls, while too much vitamin D can have the oppositve effects. You must choose and use vitamin D supplements carefully if you want the best for you and your family.
Our tests found many quality supplements providing 400 IU to 5,000 IU of vitamin D, but we also found products which did not contain their claimed amounts of vitamin D: One contained too much vitamin D, and a children's product contained less than what was listed on the label.
We also tested combination vitamin D supplements for amounts of other key ingredients, such as calcium, vitamin K and magnesium. Tablets were tested to ensure they disintegrated properly to release their ingredients for absorption, and all supplements were tested for contamination with lead, arsenic and cadmium.
You must be a ConsumerLab.com member to get the full test results and vitamin D quality ratings for vitamin D supplements including combination products with calcium, magnesium, and/or vitamin K. You'll also get vitamin D cost comparisons to help you find the right product at the best price -- some costing only 1 cent per day. You will get results for 42 vitamin D supplements: 21 selected for testing by ConsumerLab.com and 21 additional products that passed the same tests through CL's voluntary Quality Certification Program, as well as information about two supplements similar to ones that passed testing.
In this comprehensive report, you'll discover:
- Which vitamin D supplements failed our quality ratings and which passed -- including combinations with calcium, magnesium and/or vitamin K
- Cost comparisons to help you choose the best vitamin D supplement for your money
- What vitamin D can and can't do for you, and how too much can actually harm you
- What is vitamin D, and is vitamin D2 or D3 best for you?
- The best time to take vitamin D
- What is vitamin D deficiency and how to gauge if your vitamin D levels are sufficient, too low, or too high -- and how this may differ if you are black
- Vitamin D dosage based on your age, gender and needs
- How to get vitamin D from the sun and from foods
- Side effects of vitamin D supplements and potential drug interactions
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