In a study published in the November issue of the International Dairy Journal (available ahead of publication online), researchers report that whey protein:
Lowered total cholesterol and LDL (bad cholesterol)
Lowered systolic and diastolic blood pressure in subjects with elevated blood pressure
Subjects consumed 28 grams daily of either hydrolyzed or non-hydrolyzed whey protein. Both kinds of protein significantly reduced measures of cholesterol and blood pressure.
It is thought that some of the bioactive peptides (see Table 1 on this link for a complete list) found in whey may act to lower blood pressure. Milk protein peptides are formed through enzymatic breakdown during digestion.
For more on whey protein and cardiovascular health, and how Aminogen factors in, read this post, this one, and check out the entire cardiovascular health section of the blog.