You can find it on many commercial websites. One in particular being a very popular one for everyone. It's considered a supplement in the U.S.Just type in the name and a few brands will pop up with ratings. It is a very good anxiolytic but should only be used sparingly. Many people have become physiologically addicted or tolerant to it. So it will give you withdrawals, if used daily as a treatment. 2-3 times a week max., is the most I ever used it and on special occasions.
It is not a longterm solution to any anxiety disorder! But it really does work as a relaxant.