Fatty Fish
Fatty fishes such as salmon and mackerel are good sources of omega-3 fatty acids. [2]
These fats are vital for blood circulation, because they stimulate the release of nitric oxide, which expands your blood vessels and improves blood flow.
Omega-3 fats are also used to stop the clumping of platelets in your blood, a process that can cause formation of blood clots.
Additionally, fish oil supplements are used to reduce high blood pressure and enhance blood flow in skeletal muscle during and after exercise.
A study was done on 10 healthy men that showed high doses of fish oil (4.2 grams daily for four weeks) greatly improved blood flow to the legs after exercise.
Beets
Most athletes ingest with beet juice or beet powder to help boost performance.
This is because beets have high amounts of nitrates, which your body converts into nitric oxide. Nitric oxide are vasodilators.
Beet juice supplements enhance oxygen flow in muscle tissue, promote blood flow and elevate nitric oxide levels, all of which can improve performance.
Beets are very vital in improving blood flow in adults with circulatory problems.
In a study in 12 older adults, those who ingested 5 ounces (140 ml) of nitrate-rich beet juice every day experienced significant reduction in blood pressure, clotting time and blood vessel inflammation than those who consumed a placebo.