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CL Answers (35)

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Recalls & Warnings (41)

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Clinical Updates (17)

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6/08/2017

How To Get Vitamin K From Food

Many of the benefits of vitamin K - such as proper blood clotting and calcium utilization for bone and heart health - are associated with getting adequate vitamin K from foods. The good news? Brand new research has found much higher amounts of vitamin K2 (the form associated with cardiovascular benefits) in dairy foods than previously known. However, the amounts vary tremendously depending on whether these foods are full-fat, or reduced-fat or fat-free. Get the details in the "Vitamin K from food" section of the Vitamin K Supplements Review. If you're interested in a vitamin K supplement, see our Top Picks among brands.
2/18/2020

Vitamin K for Bone Density?

Vitamin K (as MK-7) was given daily for one year to older men and women to see if it would improve bone mineral density. Some also received vitamin D and calcium. Find out if it helped, as well as the results of related studies, in the What It Does section of the Vitamin K Supplements Review. Also see our Top Picks among vitamin K supplements.
8/26/2020

Vitamin K & Heart Health

Can taking vitamin K supplements improve vascular stiffness or lower blood pressure in people with kidney disease? Find out what a recent study showed in the What It Does section of our Vitamin K Supplements Review. Also see our Top Picks for vitamin K.
4/28/2020

A Role for Vitamin K in COVID-19?

A new study showed a link between vitamin K and the development of COVID-19. Learn what this means in the What It Does section of our Vitamin K Supplements Review. Also see our Top Pick among vitamin K supplements.
3/31/2013

Low Dose of Vitamin K Helps Bone

Using a much lower dose of vitamin K than in previous studies, a new study found that intake of a particular form of vitamin K decreased age-related decline in bone mineral content and density in certain bones in postmenopausal women. Get the details, as well as our ratings of these supplements, in the updated Vitamin K Supplements Review >>
10/13/2020

Vitamin K for Weak Bones?

Does supplementing with vitamin K2 as MK-7 along with vitamin D and calcium improve bone density in postmenopausal women with weak bones (osteopenia)? Find out what a recent study showed in the What It Does section of Vitamin K Supplements Review. Also, learn about other forms of vitamin K used for increasing bone density and see our Top Picks for vitamin K.
10/31/2020

Warfarin and Low-Dose Vitamin K

Should people on warfarin (Coumadin) take low-dose vitamin K to help stabilize fluctuations in INR? Learn what experts say in the What It Does section of our Vitamin K Supplements Review. Also, learn if other blood thinning drugs are affected by vitamin K in the Concerns and Cautions section of our review.
11/18/2020

Vitamin K and Breast Cancer Risk

Can eating foods high in vitamin K affect the risk of breast cancer? Learn what a recent study showed in the What It Does section of our Vitamin K Supplements Review. Also see our Top Picks for vitamin K supplements.
1/15/2021

Vitamin K & Risk of COVID Death

A marker of low vitamin K levels has been linked to a higher risk of death in people with COVID-19, according to a new study. Get the details in the COVID-19 section of our Vitamin K Supplements Review.
10/23/2021

Vitamin K and Coronary Artery Calcification

Can supplementing with vitamin K1 slow coronary artery calcification? See what a new study among people with diabetes found in the What It Does section of our Vitamin K Supplements Review. Also see our Top Picks among vitamin K supplements.
7/31/2021

Improving Berberine Absorption?

Learn if special formulations have greater benefit than berberine alone, in the ConsumerTips section of our Berberine and Goldenseal Supplements Review.
6/20/2014

Too Much Calcium for Some?

A new study found that supplementing with even moderate amounts of calcium may cause abnormally high calcium levels in the urine (a risk factor for kidney stones) of some postmenopausal women, even when total calcium intake doesn't exceed the recommended daily allowance. Get the details in the update to the Calcium Supplements Review (Including Vitamin D, Vitamin K, and Magnesium) >>   
6/24/2014

Vitamin D May Help Lower Blood Pressure

A recent study in people with mild to moderate high blood pressure showed that taking a vitamin D supplement helped lower blood pressure. Subjects in the study were already taking a calcium channel blocker (nifedipine), but taking vitamin D reduced blood pressure by several additional points. For details, including the dose of vitamin D used, as well as our tests of vitamin D supplements which can provide this dose, see the updated Vitamin D Supplements Review (Including Calcium, Vitamin K, and Magnesium) >>    
7/12/2014

Vitamin D & Calcium for Diabetes Due to Pregnancy

A new study found supplementation with a combination of vitamin D and calcium improved fasting blood sugar levels, serum insulin levels, and insulin sensitivity in women with gestational (pregnancy-related) diabetes. For more details, including dosage, as well as our tests and comparisons of vitamin D and calcium supplements, see the update to the Vitamin D Supplements Review (Including Calcium, Vitamin K, Magnesium) >>   
2/13/2018

Fish Oil for Ulcerative Colitis

A special formulation of high-dose fish oil was found to help people with ulcerative colitis remain in remission in a placebo-controlled study. It also reduced levels of a key marker of inflammation. For details, see the Arthritis and Other Inflammatory Diseases section of the Fish Oil Supplements Review.
11/23/2019

Magnesium-L-Threonate for Memory?

What is the evidence that a special form of magnesium helps people with memory and concentration impairment? Find out in the Dementia and cognition section of the Magnesium Supplements Review. Also see our Top Picks among magnesium supplements.
10/21/2012

Can Echinacea Prevent Colds?

Although the evidence behind echinacea has been mixed, a new study -- the largest to date -- found that taking a particular type of echinacea supplement throughout cold season reduced cold "events" (catching colds and days spent with colds) by 26%. See the update to the Echinacea Supplements Review for details about this particular supplement, including the special way it is taken. More >>

News Releases (12)

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