You could try garlic XD
I've read stuff about galic increasing NO production before, but this is all I could find quickly:
Research suggests that garlic can help make small improvements in blood pressure by increasing the blood flow to the capillaries, which are the tiniest blood vessels. The chemicals in garlic achieve this by causing the capillary walls to open wider and reducing the ability of blood platelets to stick together and cause blockages.
Reductions are small -- 10 mmHg (millimeters of mercury, the unit of measurement for blood pressure) or less. This means if your blood pressure is 130 over 90 mmHg, garlic might help lower it to 120 over 80 mmHg. That's a slight improvement, but, along with some simple lifestyle adjustments, such as getting more exercise, garlic might help move your blood pressure out of the danger zone.
Preliminary studies indicate that garlic may also increase the production of nitric oxide. This chemical compound is produced in the lining of blood vessels, and it helps the vessels relax and allow blood to flow more freely.
for the full article http://home.howstuffworks.com/garlic6.htm