It’s always hard to find good research on herbs and vitamin supplements; one website I recommend is the Mayo Clinic (Drugs and Supplements – MayoClinic.com.) They have a nice collection of the top few dozen treatments.
The same good folks at Mayo Clinic also have a nice, free weekly e-newsletter called “Housecall”, which you can subscribe to on their first page.
UPDATE 2024: Please follow me at my new website, DrSaintCyr.com. Also my new YouTube channel youtube.com/@drsaintcyr