Does Your Child Take St. John's Wort?

I was recently advised to try giving my son St. John's Wort which, being natural, is preferable to experimenting with mood altering medications at this point. Other things have been suggested, but I'd like to try this first.

So, I've been Googling, and now I'm seeking some information from parents who's children take St. John's Wort for depression or anxiety..

If your child takes this:
How old is the child?
What dose does he or she take?
What time of day does he or she take it?
Has it helped? - In what ways?

TIA.