Barbara Walters: Next, an absolutely amazing medical discovery. A simple herb that could change the lives of millions of Americans who suffer from depression. Dr. Timothy Johnson with a medical revolution in the making.

Hugh Downs: Now a truly startling medical breakthrough, one that could affect millions of people who suffer from mild depression. Right now many of them are treated with drugs like Prozac, but there may be a better way. Researchers say an amazing herb is proving to be safer, cheaper, and just as effective as prescription drugs in treating depression. Traditional medicine is slowly holding out a hand to some alternative therapies, and as Dr. Timothy Johnson will show you, all of us may reap the benefits.

Barbara Walters: Tim, I think this is one of the most important stories that we have done in years . . . But a lot of doctors, I'll bet, don't know about this herb, and how do you know about dosage?

Timothy Johnson, M.d.: Well, that's a very important question. We point out that [doctors] don't {know about hypericum], and what I would recommend is Dr. Bloomfield's book -- it's a practical source of dosage and information that both you and your doctor can learn from.