Welcome to the community Yellville...I hate to start off my introduction by disagreeing with one of your statements. Although, national newspapers state that mate has caffeine, it can be argued that mate instead has a different chemical compound known as mateine. Mateine is different in that it does not cause jitters or have any of the negative aspects of caffeine.
To this day, scientists have argued as to whether mate has mateine or caffeine, and since there has been to little research on the subject, it is hard to tell who is right.
The element does has the stimulating effect such as caffeine, so it should still be avoided by those who have high blood pressure.
Welcome aboard, I hope you continue posting!