How effective is Kava Kava in treating anxiety and depression?

Question

I was reading the information below that I found on the following website: http://www.gslsupplements.com And I was wondering how effective can this herb be in treating anxiety as well as depression. I thought that Kava Kava was only given for anxiety. I didn't know people also take it for depression. Anyways, I just would like to know how well it works.

Thanks!

"Premium GSL ® Kava Kava is made from whole kava roots to produce the highest quality product. Kava is an all-natural, mild sedative that relaxes the body without harmful side effects. The active compound “kavalactones” acts as a muscle relaxant and sleep aid. It also helps to reduce anxiety, restlessness, and stress. It has become a popular botanical because it also works on the central nervous system and promotes relaxation to those suffering from anxiety or depression."

Answer 1

http://hubpages.com/hub/How-Effective-is...

Answer 2

Here's the weasel words:  It "***promotes relaxation*** to those suffering from anxiety or depression."

So your would be depressed, but relaxed about it?  

It is a mild muscle relaxant and sedative, nothing more. Very useful, but not magical.