There is no chart – normal blood pressure is 120/80. Common causes for blood pressure include aging, family history. It could also include controllable factors such as obesity, smoking or excessive alcohol consumption, stress, diabetes, physical inactivity. Nowadays, you have the option of taking dietary supplements as a helpful method to nutritionally support normal blood pressure. There are nutrients and herbs that research shows may help to normalize blood pressure. These include potassium citrate, Vitamin D, folic acid, taurine (an antioxidant), natto-kinase (an enzyme produced from soybeans). Research shows all of these play a favorable role in maintaining normal blood pressure. Blood Pressure Matrix, a blood pressure supplement, is an option that many people prefer. Please consult with your doctor first before taking blood pressure supplements .