Inclusion Criteria:  untreated as well as currently treated hypertensives rs587168 allele carriers not on more than two anti-hypertensives normal renal, metabolic, electrolyte, and CBC laboratory tests self-identified Black race age >17 yrs.  Exclusion Criteria:  known cardiac disease other than HTN renal, circulatory or neurologic diseases diabetes smoking secondary HTN as indicated by history, physical examination or screening blood and urine tests smoking any drug therapy, except for anti-hypertensives and stable thyroid medication replacement