Tranquil E anyone used it? Any good as a calmer?

[jen1]

My poor horsey is still on box rest, he has been having Sedalin to chill him out on stressy days, but my vet suggested using a herbal calmer that includes Valerian. I have searched the internet and found one called Tranquil E, just wondered if anyone has used it or if you know of any other products containing Valerian that may be useful??
Thanks!
Will put this in Vet too as not sure what section it should be in!!