Nutrition Grape seed extract lowers blood pressure February 6, 2017February 6, 2017 promotinghealthnaturally Over a period of 6 weeks, grape seed extract (300mg/d) significantly reduced systolic blood pressure by 5.6% and diastolic blood pressure by 4.7%. Source Share:TwitterFacebookGoogleLike this:Like Loading... Share:TwitterFacebookGoogleLike this:Like Loading...