Join FREE Newsletter

My Account Logout Contact Us Subscribe Now! Login Contact Us
Home Product Tests  Warnings  Encyclopedia News Where to Buy

Product Review: Vitamin K Supplements (Including Calcium and Vitamin D)

Initial Posting: 4/4/15 
Vitamin K Supplements Reviewed By Does Your Vitamin K Supplement Contain What It Claims? Not All Do!

Find the Best Vitamin K Supplement For You, Now.

Alphabetical list of vitamin K supplements reviewed and rated in report
Country Life Bone Solid Mason Natural K USANA Active Calcium
Dr. Mercola Vitamin K2 Nature's Way Alive Calcium Bone Formula USANA Vitamin D
Jarrow Formulas Bone-Up NOW Vitamin D-3 & K-2 Viactiv Calcium Plus D - Milk Chocolate
Life Extension Super K With Advanced K2 Complex Shaklee Osteomatrix  
Make sure the vitamin K supplement you take passed our tests and is right for you!
Isn't your health worth it?
In addition to its critical role in blood clotting, vitamin K may increase bone mineral density and reduce the risk of hip fracture when used in combination with adequate intake of calcium and vitamin D. Studies also suggest that certain forms of vitamin K may reduce the risk of death from heart attack and cancer.
So what's the best vitamin K supplement? 

Our tests found several high quality products which provide 50 mcg of vitamin K for as little as 1 cent per day. But we also found products that contained incorrect amounts of vitamin K or other key ingredients. In fact, one contained none of its listed K2 (MK-7) — a more potent, and typically more expensive, form of vitamin K.

We also checked combination products to see if they contained their claimed amounts of other bone health ingredients, like vitamin D, calcium and magnesium. Unfortunately, not all did. Products were further checked for contamination with lead, arsenic and cadmium, and tablets were tested to be sure they properly break apart to be fully available for absorption. 
You must become a member to get the full test results and quality ratings for eleven supplements with vitamin K -- six selected for testing by and five others that passed the same tests through CL's voluntary, Quality Certification Program.  

In this comprehensive report, you'll discover:
    • Which vitamin K supplements failed our quality ratings and which passed -- including vitamin K-only supplements and combinations including vitamin D, calcium, and magnesium
    • Cost comparisons to help you choose a vitamin K supplement offering the best value
    • The differences in potency among vitamin K1 and the two forms of vitamin K2 now sold -- menaquinone-4 (MK-4) and menaquinone-7 (MK-7)
    • Dosage of vitamin K for specific uses
    • Foods containing vitamin K 
    • Potential drug interactions and side effects of vitamin K, including concerns about soy allergy 

If you already are a member, SIGN IN now. Answers -- for Vitamin K Supplements (Including Calcium and Vitamin D)
I would like to know about different sources of vitamin K2. I have been told it is from natto or fermented soy and from a flower called geraniol. Can you tell me the difference? Is one source better than another? Get the answer >>

Do any supplements help prevent or treat osteoporosis? Get the answer >>

I'm considering taking vitamin K for my bones, but I take blood thinner (anti-coagulant) medication. Is there a problem taking both? Get the answer >>

Follow on Twitter    |     Become a Fan on Facebook
Join | Sign In
Home | Product Tests | Brands Tested | Encyclopedia | CL Answers | Clinical Updates | Where to Buy Products | Group Subscription
News | Recalls & Warnings | Raw Materials Tests | Testing Programs | The CL Seal | CL Survey | About Us
In The News | RDAs | Gift Memberships | Join Free Newsletter | Privacy Policy | Site Map | Testimonials | Contact Us/Help

©2015, LLC. All rights reserved. A single copy of a report may be printed for personal use by the subscriber.
It is otherwise unlawful to print, download, store or distribute content from this site without permission. name and flask logo are both registered trademarks of, LLC.