A quick Google search (“soy” and “blood pressure”) reveals the predominant view that soy has positive effects on the heart and significant (but mild) blood pressure lowering action in people with high blood pressure.
Here is another view.
In 41 people with high blood pressure, soy dietary supplementation containing isoflavones had no effect on 24-hour blood pressure parameters or central blood pressure in men and women with hypertension. Also, there was no effect on arterial blood vessel function.
It’s one study and a minority view, but I think the jury is out on the significance of the effect of soy on blood pressure.
John Russo, Jr., PharmD, is president of The MedCom Resource, Inc. Previously, he was senior vice president of medical communications at www.Vicus.com, a complementary and alternative medicine website.