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The purpose of the study is to employ the supplement L-arginine to test the hypothesis that activation of blood flow to the brain during cognitive tasks is regulated by nitric oxide in older subjects with diabetes mellitus and/or hypertension (high blood pressure).
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Ages Eligible for Study:
70 Years and older (Senior)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
diabetes and/or hypertension
alzheimers disease, dementia, stroke, active herpes, recent angina or heart attack