ConsumerLab.com uses JavaScript to provide the best possible experience for our content, but your browser has it disabled. Learn how to enable it here.

About ConsumerLab.com


Make sure you're choosing the best vitamin K supplements approved in our tests!

See the Full Review Now

Join now at www.consumerlab.com/join/

Alphabetical list of vitamin K supplements compared in this review

View Larger Image 7739_large_Bluebonnet-VitaminK-BoneHealth-2022.png

Bluebonnet Vitamin K1 100 mcg

View Larger Image 7740_large_Bronson-VitaminK-BoneHealth-2022.png

Bronson Vitamin K2

View Larger Image 7806_large_Flora-BoneHealth-VitaminDK-BoneHealth-2022.png

Flora Bone Health+ with Calcium, Magnesium, and Vitamin D & K

View Larger Image 7741_large_GardenOfLife-VitaminK-BoneHealth-2022.png

Garden of Life Vitamin Code RAW K-Complex

View Larger Image 7803_large_GNC-VitaminK-BoneHealth-2022.png

GNC Vitamin K

View Larger Image 7742_large_HealthyOrigins-VitaminK-BoneHealth-2022.png

Healthy Origins Vitamin K2 as MK-7

View Larger Image 7743_large_InnovixLabs-VitaminK-BoneHealth-2022.png

InnovixLabs Full Spectrum Vitamin K2

View Larger Image 7809_large_JarrowFormulas-BoneHealth-2022.png

Jarrow Formulas BoneUp

View Larger Image 7810_large_LifeExtension-VitaminK-BoneHealth-2022.png

Life Extension Bone Restore with Vitamin K2

View Larger Image 7808_large_Naturelo-BoneHealth-2022.png

Naturelo Bone Strength Plant Calcium Complex With Magnesium, C, D3, K2, & Zinc

View Larger Image 7807_large_NewChapter-BoneHealth-2022.png

New Chapter Bone Strength Take Care

View Larger Image 7804_large_NOW-D3K2-BoneHealth-2022.png

NOW Vitamin D-3 & K-2

View Larger Image 7805_large_SportsResearch-D3K2-BoneHealth-2022.png

Sports Research Plant-Based D3 + K2 2-in-1 Formula

View Larger Image 7744_large_Thorne-VitaminK-BoneHealth-2022.png

Thorne 3-K Complete

Join to unlock the full report and get full access to over 1,300 reviews

See the Full Review Now

Join now at www.consumerlab.com/join/

Summary

  • What is vitamin K?

    Vitamin K helps with proper blood clotting as well as with calcium utilization in bones and the cardiovascular system (see What It Does).
  • Do you need to take vitamin K as a supplement?

    Most people are not deficient in vitamin K and symptomatic deficiency is rare, so unless you have a malabsorption condition or are severely malnourished, you likely get sufficient vitamin K from your diet (e.g., from green leafy vegetables, dairy, and fermented foods (see how to get vitamin K from food). Vitamin K supplements, typically at high doses, have been clinically evaluated to see if they increase bone density and reduce fractures, or improve cardiovascular function, but results have been mixed, so it is not clear that supplementation will help (see What It Does).
  • Which form of vitamin K is best?

    There are several forms of vitamin K. All are active, but one, the MK-7 form of vitamin K2, can increase blood levels of vitamin K up to 8 times as much as other forms (see What It Is and What to Consider When Buying).
  • What did CL's tests of vitamin K supplements find?

    Among the vitamin K supplements ConsumerLab.com selected for testing, two failed our tests because they each contained much less vitamin K than listed (see What CL Found).
  • Which vitamin K supplement is best?

    Among the vitamin K supplements that CL tested and Approved for Quality (see What CL Found), CL selected Top Picks, based quality, dosage, and price, for vitamin K1 as well the MK-4 and MK-7 forms of vitamin K2. CL also selected Top Picks for supplements combining vitamin K with calcium, vitamin D, magnesium, and/or boron.
  • How much vitamin K should I take?

    For adults, adequate daily intake of vitamin K is 90 mcg for women and 120 mcg for men. It is difficult to know what dose may be most useful in bone health (or if any dose is truly beneficial). However, studies involving supplements containing K1 or the MK-4 form of K2 tend to use very high doses (e.g., 500 mcg to 45,000 mcg), while studies with the MK-7 form of K2 have used more moderate doses, e.g., 180 mcg (see What to Consider When Using)
  • How to take vitamin K:

    Vitamin K is fat soluble, so you'll absorb more of it when you take it with a meal that has fats or oils. Other fat-soluble vitamins, like vitamin D, can compete with its absorption, so take them at least 3 hours apart (see What to Consider When Using).
  • Vitamin K safety and side effects:

    Vitamin K is fairly safe. However, it can interact with certain medications, including blood-thinning drugs. If you have an allergy to soy, be aware that most MK-7 forms of vitamin K are derived from soy — although one brand is derived from chickpeas (see Concerns and Cautions).
You must be a member to get the full test results along with ConsumerLab.com recommendations and quality ratings. You will get results for 11 vitamin K supplements selected by ConsumerLab.com and three others that passed testing in its voluntary Quality Certification Program.
In this comprehensive review, you'll discover:
  • Which vitamin K supplements failed our tests and which ones passed -- -- including combinations with calcium, magnesium,vitamin D & vitamin K
  • ConsumerLab.com's Top Picks among vitamin K supplements
  • How to 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  

Join to unlock the full report and get full access to over 1,300 reviews

See the Full Review Now

Join now at www.consumerlab.com/join/