Product Tests Select a Review CL Answers  Warnings  Encyclopedia Where to Buy News

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

Initial Posting: 5/20/17 Last update: 6/8/17 
Vitamin K Supplements Reviewed By

CL Identifies the Best Vitamin K Supplements — Some Others Fail Testing

Alphabetical list of vitamin K supplements reviewed and rated in report
AdvoCare Calcium Plus Garden of Life Vitamin Code Raw K-Complex Nature's Way Alive Calcium Bone Formula
AlgaeCal Plus GNC K-2 NOW Vitamin D-3 & K-2
Carlson Vitamin K2 Healthy Origins Natural Vitamin K2 As MK-7 USANA Vitamin D
Doctor's Best Artery Prime With MenaQ7 Jarrow Formulas Bone-Up Viactiv Calcium Plus D - Milk Chocolate
AdvoCare Calcium Plus AlgaeCal Plus Carlson Vitamin K2 Doctor's Best Artery Prime With MenaQ7 Garden of Life Vitamin Code Raw K-Complex GNC K-2 Healthy Origins Natural Vitamin K2 As MK-7 Jarrow Formulas Bone-Up Nature's Way Alive Calcium Bone Formula NOW Vitamin D-3 & K-2 USANA Vitamin D Viactiv Calcium Plus D - Milk Chocolate
Make sure your taking the best vitamin K supplement and it's right for you!
Isn't your health worth it?
Can you trust your vitamin K supplement? tests revealed some popular vitamin K supplements contained less vitamin K or another key ingredient, than claimed. One of these was also found to be contaminated with lead. Another product failed to disintegrate in the allotted time. 
Fortunately, our tests also found several high quality products which can provide a significant dose of vitamin K for less than one cent per day. Among products which were Approved, selected several Top Picks for providing the best quality and value.

In addition to its critical role in blood clotting, vitamin K may increase bone mineral density and reduce the risk of hip fracture when consumed with adequate intake of calcium and vitamin D. For this reason, vitamin K supplements have been clinically studied for aspects of bone health, as well as for other applications, such as cardiovascular health. Results of these studies, however, have been mixed. 

You must be a member to get the full test results and quality ratings for twelve supplements with vitamin K -- eight selected for testing by and four others that passed the same tests through CL's voluntary, Quality Certification Program.  

In this comprehensive report, you'll discover:
    • Which are the best-rated vitamin K supplements, and which failed our quality tests
    •'s Top Picks among products
    • Quality and cost comparisons to help you choose a vitamin K supplement that best suits your needs
    • The difference in potency among the popular forms of vitamin K: vitamin K1 and two forms of vitamin K2  -- menaquinone-4 (MK-4) and menaquinone-7 (MK-7)
    • The dose of vitamin K used for specific applications and how to best take it for maximum absorption
    • How to get vitamin K from foods
    • Potential drug interactions and side effects of vitamin K, including interactions with certain anticoagulants and 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 >>

Which supplements reduce the risk of stroke? Which increase the risk of stroke? Get the answer >>

Have you tested vitamin K supplements with MenaQ7? Is this a good source of vitamin K if I need to avoid soy? Get the answer >>

Can vitamin K2 really help decrease calcium in the arteries? Get the answer >>

If vitamin K absorption appears to be reduced by other fat-soluble vitamins, like vitamin D, why do some "bone health" supplements combine them? Should they be taken separately? Get the answer >>

Are the "% DV" numbers on vitamin supplement labels really based on what I need? Get the answer >>

Are there any supplements I should avoid when taking an antibiotic? Are there any that may be helpful? Get the answer >>

Is it true that overdoses of vitamin D only occur when you don't get enough vitamin K? Get the answer >>

Does taking a laxative interfere with the absorption of vitamins or minerals? Get the answer >>
Join |  Sign In
Product Tests
Brands Tested
Health Conditions
CL Answers
Clinical Updates
Recalls & Warnings
Where to Buy Products
Raw Materials Tests
Testing Program
Join CL Today
Join Free Newsletter
Group Subscriptions
Gift Membership
About Us
The CL Seal
CL Survey
Privacy Policy
Contact Us/Help

©2018, 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. This site is intended for informational purposes only and not to provide medical advice.