ConsumerLab Tests Reveal Best Vitamin K Supplements

White Plains, NY, July 30, 2024 — Vitamin K helps with proper blood clotting as well as with calcium utilization in bones and the cardiovascular system. Although most people get enough vitamin K through their diet, it is commonly included in bone health formulas that may include vitamin D, calcium, magnesium, and/or boron. To help consumers identify the best vitamin K supplements, ConsumerLab selected its Top Picks among vitamin K supplements and its Top Picks among bone health formulas based on its laboratory tests for quality and considering formulation, dosage, and value.

In addition to vitamin K, were also tested for claimed amounts of other key ingredients, contamination with toxic metals such as lead, arsenic, cadmium, and mercury, and if in tablet form, they were tested to determine if they would disintegrate properly to release their ingredients.

Key Findings:

• Vitamin K Supplement Quality: Most vitamin K supplements contained their claimed amount of vitamin K and other key ingredients and were of generally high quality. However, one product was found to contain only 80.8% of its listed amount of vitamin K (as MK-7). A second product, a combination formula, contained its claimed amount of vitamin K, but contained much more vitamin D than listed on the label. While some overage of vitamin D is acceptable, the amount found in this product could increase the risk of hypercalcemia (too much calcium in the blood) for some people.
• Vitamin K Dosage: There was wide variation in the amount of vitamin K provided by products, ranging from just over 50 mcg to 115 mcg of the MK-4 form of vitamin K2 to between 52 mcg to over 1,300 mcg of the MK-7 form of vitamin K2 per suggested serving.
• Cost: The cost to obtain the daily recommended daily intake for vitamin K (90 mcg for women and 120 mcg for men) from products ranged from as little as 6 to 11 cents to more than $1.

Access the Full Report:

If you are one of more than 100,000 ConsumerLab members who support ConsumerLab’s research, you can now access the full Vitamin K Supplements Review.

The report includes test results and comparisons for 12 vitamin K supplements, including drops, capsules, and soft gels. Seven products were selected for testing by ConsumerLab: AlgaeCal Plus, Bluebonnet Vitamin K1 100 mcg, Bronson Vitamin K2, Life Extension Bone Restore Calcium Supplement with Vitamin K2, New Chapter Plant Calcium Bone Strength Take Care, Sports Research D3 + K2, and Thorne Vitamin D + K2. Five additional products passed the same testing and were Approved through CL's voluntary Quality Certification Program: Carlson Super Daily D3 + K2, Healthy Origins Natural Vitamin K2 as MK-7, Innovixlabs Full Spectrum Vitamin K2, Innovixlabs Vitamin D3 + K2, and Life Extension Vitamins D and K with Sea-Iodine.

The Review also explains how you can get vitamin K from certain foods and the pros and cons of different forms of vitamin K, as well as the best way to take vitamin K to improve absorption and potential side effects and drug interactions with vitamin K.

A short video with expert tips for selecting the best vitamin K supplements is also available.

Founded in 1999, ConsumerLab.com is a leading provider of consumer information and independent evaluations of products that affect health and nutrition. Membership to ConsumerLab.com is available online and provides immediate access to continually updated reviews of nearly every popular type of dietary supplement and health food, answers to reader questions, and product recalls and warnings. ConsumerLab also provides independent product testing through its voluntary Quality Certification Program. The company is privately held and based in New York. It has no ownership from, or interest in, companies that manufacture, distribute, or sell consumer products.

Learn About Vitamin K Supplements from ConsumerLab’s Dr. Tod Cooperman