-Nitric oxide is created from oxygen and arginine thanks to nitric oxide synthase enzymes.
-There are three main nitric oxide synthase (NOS) enzymes, the key for blood vessel vasodilatation is Endothelial NOS (eNOS).
-It is believed that oxidative stress (caused by free radicals & more likely as we age) is one of the main reasons that the body stops creating enough eNOS.
-Endothelial dysfunction also has a negative impact on the production of eNOS
-NO and eNOS are probably both created during exercise (possibly one of the ways exercise works to lower blood pressure)
-NO and eNOS have a complicated relationship; neither one acts properly without the other.
So, as far as the supplements go I would be inclined to think that they probably would not work, since you need the eNOS, not just the NO.
If you want to get your body to create more of the NO it needs to regulate blood pressure, I would suggest an exercise routine and antioxidants. I would also encourage you to look into a device called the Zona Plus- it has be scientifically proven to reverse endothelial dysfunction and increase Nitric Oxide in the blood stream. My grandfather used it to lower his blood pressure over 50 points.
It took about 7 weeks of using the device 5 times a week for my grandpa to see the drop in this blood pressure. His BP was really high when he started using the device... often over 200 systolic. The Zona lowered his BP to where it bounced around the 140-145 range and then he changed his diet and has kept it in the normal range for several years now, even while going though all the stress of Grandma getting Alzheimer's.
I totally understand being afraid of exercise when your BP is already so high to start with, but my understanding is the Zona is completely safe.
I have found a product called Pro Argi-9 Plus that has helped myself and many others lower their blood pressure and also has dramatically helped others with diabetes. You can find out more info at the following website:
Give it a try I am convinced it will help many others also.