Here's an example of the kind of research one can find that is distressingly absent from the considerations of most doctors, in this case regarding the potential benefits for patients suffering from certain degrees of congestive heart failure. Notice the other studies highlighted in purple to the right of the abstract, which show how substantial the claims are for both efficacy and safety (the latter re: drug interactions and outright side-effects):


http://tinyurl.com/ge9nv