I don't know this for sure, but I also have high blood pressure, and I take a lot of stuff that says don't take if you have high blood pressure, but X-Factor contains Arachidonic Acid, here is a little info that might help you make a choice.
"AA may have some harmful effects. AA is produced in the body from Linoleic Acid. It is also found in meat, eggs, and some fish. The body uses AA to produce a class of eicosanoids that are strongly pro-inflammatory, constrict our blood vessels, and increase the possibility of blood clotting. These compounds are very useful when you accidentally cut your skin while peeling potatoes - without them you would bleed to death. But once you have an excessive amount of these eicosanoids, the blood can clot in places you don't really want it to - for example, arteries
link:Essential Fatty Acid Nutrition, EFAs, Health from the Sun
So my thought is it constricts the blood vessels, that will increase blood pressure.
I"m sure someone knows more about this than me, this is just what I worry about, but I'm still thinking about giving x-factor a run.