I've known a few people who tried St. John's Wort and they all felt that it helped them a lot, and then they eventually didn't need it anymore. That's one of the great things about herbs...no withdrawal or side-effects if you decide to stop taking them.

I agree with others about getting a good quality. Most of the clinical studies on St. John's Wort have used an extract of the herb that was standardized to contain the active ingredients, hyperforin and hypericin.

Here's more information about St. John's Wort:
St. John's Wort

Let me know if you have any questions,