Valerian is most useful in helping the uptight horse, and when used over a period of time, it can help with excitability, nervousness and stress.   It has the effect of allowing the horse to relax his whole body and may also be beneficial in horses prone to tying-up.

Some herbs may swab

Vervain has tonic, nerve restoring qualities which, combined with its ability to improve liver and digestive function, makes it well-suited to horses that are convalescing from chronic illness.  As a nervine relaxant and antispasmodic it can assist horses that are tense and sensitive by relaxing the gut, peripheral nerves and muscles.

Some herbs may swab.