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.

Many studies have assessed the potential benefits of taking fish oil supplements. Results have been conflicting, but one of the largest and longest-term studies was recently published. See what it found in the What It Does section of the Fish Oil Supplements Review. Also see our general recommendations for using fish oil for heart health and check out our Top Picks for fish oil supplements.

The American Heart Association recently affirmed that eating fish may help to reduce the risk of cardiac death, coronary heart disease, and ischemic stroke. However, the same cannot be said for fish oil supplements. Get the details in the What It Does section of the Fish Oil Supplements Review. Also, stay tuned: ConsumerLab is currently testing popular brands of canned tuna and salmon to assess their purity and levels of omega-3 fatty acids.

Are fish oil supplements good for the heart? See what a review of over 70 clinical trials concluded in the Heart Attack and Stroke section of the Fish Oil and Omega-3 Supplements Review.

Also, learn what fish oil can or cannot do for other health conditions, such as arthritis, in the What It Does section of the review. (See our Top Picks among fish and marine oils.)

Is coffee consumption associated with the risk of atrial fibrillation and other arrythmias? See the latest findings in our article about Coffee and Heart Health.

Can drinking coffee increase or decrease the risk of dementia? A cause-and-effect relationship has not been established but some striking associations were recently found based on consumption levels. We've added the details to the Safety section of our article about Coffee and Heart Health.

Does drinking coffee increase arterial stiffness, a predictor of heart disease? Find out what research shows in our updated answer about Coffee and Heart Health.

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.