1) Quit smoking, if you smoke.
2) Stop eating processed foods and foods high in sodium containing salt. A DASH diet is one of the most proven diets to help with blood pressure.
3) get moderate exercise every day
4) Limit alcohol intake.
Among the dietary supplements, magnesium and omega 3 supplements have both shown good promise to help with hypertension. Garlic pills work really well too, but if you are on blood thinning medication, you should use these with care, since combined use may lead to clotting problems.